多线程共享IndexWriter addDocument时报错

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1.线程中定义共享 IndexWriter 

private static IndexWriter indexWriter = null;

Analyzer analyzer = new org.wltea.analyzer.lucene.IKAnalyzer();
IndexWriterConfig conf = new IndexWriterConfig(Version.LUCENE_35, analyzer);

indexWriter = new IndexWriter(directory, conf);

2.多线程往 IndexWriter中添加doc时报错（小概率事件）


异常信息：
java.lang.NullPointerException
    at org.wltea.analyzer.Context.lockBuffer(Context.java:96)
    at org.wltea.analyzer.seg.CJKSegmenter.nextLexeme(CJKSegmenter.java:162)
    at org.wltea.analyzer.IKSegmentation.next(IKSegmentation.java:84)
    at org.wltea.analyzer.lucene.IKTokenizer.incrementToken(IKTokenizer.java:51)
    at org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:135)
    at org.apache.lucene.index.DocFieldProcessorPerThread.processDocument(DocFieldProcessorPerThread.java:278)
    at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:766)
    at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:2066)
    at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:2040)
    at com.ai.zj.inter.sys.rm.lucene.service.impl.LuceneIndexWriterSVImpl.geneDocuments(LuceneIndexWriterSVImpl.java:170)
    at com.ai.zj.inter.sys.rm.lucene.service.impl.LuceneIndexWriterSVImpl._geneStdAddrLuceneInx(LuceneIndexWriterSVImpl.java:48)
    at sun.reflect.GeneratedMethodAccessor57.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.ai.appframe2.complex.service.proxy.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:110)
    at com.sun.proxy.$Proxy12._geneStdAddrLuceneInx(Unknown Source)
    at com.ai.zj.inter.sys.rm.lucene.task.sv.impl.NewResStdAddrLuceneInxGenerateTask.doTask(NewResStdAddrLuceneInxGenerateTask.java:138)
    at com.asiainfo.appframe.ext.exeframe.task.TaskJob.execute(TaskJob.java:76)
    at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
    at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529)

Original issue reported on code.google.com by [email protected] on 12 Feb 2014 at 9:01

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麻烦大神 帮忙解决一下！

Original comment by [email protected] on 12 Feb 2014 at 9:02