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Errors showing keys for Lucene indexes [BUG] #213

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vincentml opened this issue Oct 3, 2022 · 0 comments
Open

Errors showing keys for Lucene indexes [BUG] #213

vincentml opened this issue Oct 3, 2022 · 0 comments

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@vincentml
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I've run into two problems trying to use Monex to inspect Lucene indexes.

  1. Trying to view index keys by QName returns 0 keys even when the index is populated. This looks similar to issue Index for new range field doesn’t show keys [BUG] #191
  2. Trying to view index keys by Node gives a 500 error with a message "name is empty"

At first I thought this was an error in the way that I created the indexes but after testing with a minimal example this seems to be a bug.

To reproduce this error I created a minimal collection.xconf file defining a Lucene index and reindexed a collection that contained a document.

<collection xmlns="http://exist-db.org/collection-config/1.0">
    <index xmlns:xs="http://www.w3.org/2001/XMLSchema">
        <lucene>
            <analyzer class="org.apache.lucene.analysis.standard.StandardAnalyzer"/>
            <analyzer id="ws" class="org.apache.lucene.analysis.core.WhitespaceAnalyzer"/>
            
            <text qname="article"/>
        </lucene>
        
    </index>
</collection>

I verified that the index is populated by using eXide to run a simple query using ft:query.

Then open Monex. Click on Indexes, then click on the collection. The Lucene index on "article" is displayed.

Click on QName. There is a message "0 keys returned in 0.409s" and the table that should show index keys is empty.

Go back.

Click on Node. An error with a stack trace is displayed. I've copied the full error message below.

Context (please always complete the following information):

  • OS: Windows
  • eXist-db Version: 6.0.1
  • Java Version: 11.0.16 (also tried Java 8)
  • App Version: 3.0.4

Additional context

  • How is eXist-db installed? Fresh install by extracting zip file.

Here is the full error message:

<html><body>
<!--StartFragment--><h2>HTTP ERROR 500 javax.servlet.ServletException: 
javax.servlet.ServletException: An error occurred while processing 
request to /exist/apps/monex/index-keys.html: An unknown error occurred:
 name is empty</h2>


URI: | /exist/apps/monex/index-keys.html
-- | --
500
javax.servlet.ServletException:  javax.servlet.ServletException: An error occurred while processing  request to /exist/apps/monex/index-keys.html: An unknown error occurred:  name is empty
XQueryURLRewrite
javax.servlet.ServletException:  javax.servlet.ServletException: An error occurred while processing  request to /exist/apps/monex/index-keys.html: An unknown error occurred:  name is empty
javax.servlet.ServletException: An error  occurred while processing request to /exist/apps/monex/index-keys.html:  An unknown error occurred: name is empty
javax.servlet.ServletException: An unknown error occurred: name is empty
java.lang.IllegalArgumentException: name is empty


<h3>Caused by:</h3><pre>javax.servlet.ServletException: javax.servlet.ServletException: An error occurred while processing request to /exist/apps/monex/index-keys.html: An unknown error occurred: name is empty
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:162)
	at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:763)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
	at org.eclipse.jetty.server.Server.handle(Server.java:516)
	at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:400)
	at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:645)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:392)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
	at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: javax.servlet.ServletException: An error occurred while processing request to /exist/apps/monex/index-keys.html: An unknown error occurred: name is empty
	at org.exist.http.urlrewrite.XQueryURLRewrite.service(XQueryURLRewrite.java:366)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1450)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
	at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1631)
	at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:228)
	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
	at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:571)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:234)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
	... 18 more
Caused by: javax.servlet.ServletException: An unknown error occurred: name is empty
	at org.exist.http.servlets.EXistServlet.doPost(EXistServlet.java:572)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at org.exist.http.servlets.EXistServlet.service(EXistServlet.java:588)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1459)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
	at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1631)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:618)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:167)
	at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:81)
	at org.exist.http.urlrewrite.Forward.doRewrite(Forward.java:50)
	at org.exist.http.urlrewrite.XQueryURLRewrite.doRewrite(XQueryURLRewrite.java:523)
	at org.exist.http.urlrewrite.XQueryURLRewrite.applyViews(XQueryURLRewrite.java:406)
	at org.exist.http.urlrewrite.XQueryURLRewrite.service(XQueryURLRewrite.java:347)
	... 41 more
Caused by: java.lang.IllegalArgumentException: name is empty
	at org.exist.dom.persistent.SymbolTable.getSymbol(SymbolTable.java:201)
	at org.exist.indexing.lucene.LuceneUtil.encodeQName(LuceneUtil.java:90)
	at org.exist.indexing.lucene.LuceneIndexWorker.lambda$scanIndexByQName$9(LuceneIndexWorker.java:1199)
	at org.exist.indexing.lucene.LuceneIndex.withReader(LuceneIndex.java:250)
	at org.exist.indexing.lucene.LuceneIndexWorker.scanIndexByQName(LuceneIndexWorker.java:1197)
	at org.exist.indexing.lucene.LuceneIndexWorker.scanIndex(LuceneIndexWorker.java:1167)
	at org.exist.xquery.functions.util.IndexKeys.eval(IndexKeys.java:161)
	at org.exist.xquery.BasicFunction.eval(BasicFunction.java:73)
	at org.exist.xquery.InternalFunctionCall.eval(InternalFunctionCall.java:62)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.SwitchExpression.eval(SwitchExpression.java:109)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:98)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:248)
	at org.exist.xquery.value.FunctionReference.evalFunction(FunctionReference.java:99)
	at org.exist.xquery.functions.fn.FunHigherOrderFun.eval(FunHigherOrderFun.java:235)
	at org.exist.xquery.BasicFunction.eval(BasicFunction.java:73)
	at org.exist.xquery.InternalFunctionCall.eval(InternalFunctionCall.java:62)
	at org.exist.xquery.DynamicCardinalityCheck.eval(DynamicCardinalityCheck.java:73)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:189)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:98)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.isEmpty(DeferredFunctionCall.java:200)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:83)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:98)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:98)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.isEmpty(DeferredFunctionCall.java:200)
	at org.exist.xquery.DynamicCardinalityCheck.eval(DynamicCardinalityCheck.java:75)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:189)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:98)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.XQuery.execute(XQuery.java:373)
	at org.exist.xquery.XQuery.execute(XQuery.java:295)
	at org.exist.http.RESTServer.executeXQuery(RESTServer.java:1558)
	at org.exist.http.RESTServer.doPost(RESTServer.java:683)
	at org.exist.http.servlets.EXistServlet.doPost(EXistServlet.java:538)
	... 67 more
</pre>
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</body>
</html>HTTP ERROR 500 javax.servlet.ServletException: javax.servlet.ServletException: An error occurred while processing request to /exist/apps/monex/index-keys.html: An unknown error occurred: name is empty
URI:	/exist/apps/monex/index-keys.html
STATUS:	500
MESSAGE:	javax.servlet.ServletException: javax.servlet.ServletException: An error occurred while processing request to /exist/apps/monex/index-keys.html: An unknown error occurred: name is empty
SERVLET:	XQueryURLRewrite
CAUSED BY:	javax.servlet.ServletException: javax.servlet.ServletException: An error occurred while processing request to /exist/apps/monex/index-keys.html: An unknown error occurred: name is empty
CAUSED BY:	javax.servlet.ServletException: An error occurred while processing request to /exist/apps/monex/index-keys.html: An unknown error occurred: name is empty
CAUSED BY:	javax.servlet.ServletException: An unknown error occurred: name is empty
CAUSED BY:	java.lang.IllegalArgumentException: name is empty
Caused by:

javax.servlet.ServletException: javax.servlet.ServletException: An error occurred while processing request to /exist/apps/monex/index-keys.html: An unknown error occurred: name is empty
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:162)
	at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:763)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
	at org.eclipse.jetty.server.Server.handle(Server.java:516)
	at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:400)
	at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:645)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:392)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
	at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: javax.servlet.ServletException: An error occurred while processing request to /exist/apps/monex/index-keys.html: An unknown error occurred: name is empty
	at org.exist.http.urlrewrite.XQueryURLRewrite.service(XQueryURLRewrite.java:366)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1450)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
	at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1631)
	at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:228)
	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
	at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:571)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:234)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
	... 18 more
Caused by: javax.servlet.ServletException: An unknown error occurred: name is empty
	at org.exist.http.servlets.EXistServlet.doPost(EXistServlet.java:572)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at org.exist.http.servlets.EXistServlet.service(EXistServlet.java:588)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1459)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
	at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1631)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:618)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:167)
	at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:81)
	at org.exist.http.urlrewrite.Forward.doRewrite(Forward.java:50)
	at org.exist.http.urlrewrite.XQueryURLRewrite.doRewrite(XQueryURLRewrite.java:523)
	at org.exist.http.urlrewrite.XQueryURLRewrite.applyViews(XQueryURLRewrite.java:406)
	at org.exist.http.urlrewrite.XQueryURLRewrite.service(XQueryURLRewrite.java:347)
	... 41 more
Caused by: java.lang.IllegalArgumentException: name is empty
	at org.exist.dom.persistent.SymbolTable.getSymbol(SymbolTable.java:201)
	at org.exist.indexing.lucene.LuceneUtil.encodeQName(LuceneUtil.java:90)
	at org.exist.indexing.lucene.LuceneIndexWorker.lambda$scanIndexByQName$9(LuceneIndexWorker.java:1199)
	at org.exist.indexing.lucene.LuceneIndex.withReader(LuceneIndex.java:250)
	at org.exist.indexing.lucene.LuceneIndexWorker.scanIndexByQName(LuceneIndexWorker.java:1197)
	at org.exist.indexing.lucene.LuceneIndexWorker.scanIndex(LuceneIndexWorker.java:1167)
	at org.exist.xquery.functions.util.IndexKeys.eval(IndexKeys.java:161)
	at org.exist.xquery.BasicFunction.eval(BasicFunction.java:73)
	at org.exist.xquery.InternalFunctionCall.eval(InternalFunctionCall.java:62)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.SwitchExpression.eval(SwitchExpression.java:109)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:98)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:248)
	at org.exist.xquery.value.FunctionReference.evalFunction(FunctionReference.java:99)
	at org.exist.xquery.functions.fn.FunHigherOrderFun.eval(FunHigherOrderFun.java:235)
	at org.exist.xquery.BasicFunction.eval(BasicFunction.java:73)
	at org.exist.xquery.InternalFunctionCall.eval(InternalFunctionCall.java:62)
	at org.exist.xquery.DynamicCardinalityCheck.eval(DynamicCardinalityCheck.java:73)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:189)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:98)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:100)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.isEmpty(DeferredFunctionCall.java:200)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:83)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.SequenceConstructor.eval(SequenceConstructor.java:82)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.EnclosedExpr.eval(EnclosedExpr.java:82)
	at org.exist.xquery.ElementConstructor.eval(ElementConstructor.java:330)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:98)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:98)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.isEmpty(DeferredFunctionCall.java:200)
	at org.exist.xquery.DynamicCardinalityCheck.eval(DynamicCardinalityCheck.java:75)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:189)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.ConditionalExpression.eval(ConditionalExpression.java:98)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall$DeferredFunctionCallImpl.execute(FunctionCall.java:421)
	at org.exist.xquery.DeferredFunctionCall.realize(DeferredFunctionCall.java:57)
	at org.exist.xquery.DeferredFunctionCall.iterate(DeferredFunctionCall.java:232)
	at org.exist.xquery.value.ValueSequence.addAll(ValueSequence.java:173)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.TypeswitchExpression.eval(TypeswitchExpression.java:110)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:65)
	at org.exist.xquery.ForExpr.processItem(ForExpr.java:248)
	at org.exist.xquery.ForExpr.eval(ForExpr.java:187)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.UserDefinedFunction.eval(UserDefinedFunction.java:161)
	at org.exist.xquery.FunctionCall.evalFunction(FunctionCall.java:289)
	at org.exist.xquery.FunctionCall.eval(FunctionCall.java:207)
	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.LetExpr.eval(LetExpr.java:110)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.PathExpr.eval(PathExpr.java:279)
	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
	at org.exist.xquery.XQuery.execute(XQuery.java:373)
	at org.exist.xquery.XQuery.execute(XQuery.java:295)
	at org.exist.http.RESTServer.executeXQuery(RESTServer.java:1558)
	at org.exist.http.RESTServer.doPost(RESTServer.java:683)
	at org.exist.http.servlets.EXistServlet.doPost(EXistServlet.java:538)
	... 67 more

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