Queue Request: org.json.JSONException: A JSONArray text must start with '['

[leoqa]

Jenkins version: 2.164.3
Statistics Gatherer version: 2.0.3
CentOS 7.x

Also logged as I'm not sure where to log the issue: https://issues.jenkins-ci.org/browse/JENKINS-59271

When the plugin is sending 'queue' requests to Logstash, we are seeing the following messages in the Jenkins log:

The request for url http://logstashserver:5000/jenkins_queue/ has failed. org.json.JSONException: A JSONArray text must start with '[' at 1 [character 2 line 1] at org.json.JSONTokener.syntaxError(JSONTokener.java:433) at org.json.JSONArray.<init>(JSONArray.java:105) at org.json.JSONArray.<init>(JSONArray.java:144) at com.mashape.unirest.http.JsonNode.<init>(JsonNode.java:48) Caused: java.lang.RuntimeException at com.mashape.unirest.http.JsonNode.<init>(JsonNode.java:51) at com.mashape.unirest.http.HttpResponse.<init>(HttpResponse.java:95) Caused: java.lang.RuntimeException at com.mashape.unirest.http.HttpResponse.<init>(HttpResponse.java:106) at com.mashape.unirest.http.HttpClientHelper$1.completed(HttpClientHelper.java:82) at com.mashape.unirest.http.HttpClientHelper$1.completed(HttpClientHelper.java:75) at org.apache.http.concurrent.BasicFuture.completed(BasicFuture.java:119) at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.responseCompleted(DefaultClientExchangeHandlerImpl.java:173) at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.processResponse(HttpAsyncRequestExecutor.java:355) at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.inputReady(HttpAsyncRequestExecutor.java:242) at org.apache.http.impl.nio.client.LoggingAsyncRequestExecutor.inputReady(LoggingAsyncRequestExecutor.java:87) at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:264) Caused: com.mashape.unirest.http.exceptions.UnirestException at com.mashape.unirest.http.HttpClientHelper$1.failed(HttpClientHelper.java:86) at org.apache.http.concurrent.BasicFuture.failed(BasicFuture.java:134) at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.failed(DefaultClientExchangeHandlerImpl.java:258) at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.exception(HttpAsyncRequestExecutor.java:123) at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:275) at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:73) at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:37) at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:113) at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:159) at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:338) at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:316) at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:277) at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) at java.lang.Thread.run(Thread.java:748)