NullPointerException in StopFilter

 mvn test 

java.lang.NullPointerException
	at org.apache.lucene.analysis.CharArraySet.<init>(CharArraySet.java:91)
	at org.apache.lucene.analysis.StopFilter.<init>(StopFilter.java:101)
	at org.apache.lucene.analysis.StopFilter.<init>(StopFilter.java:93)
	at org.apache.solr.analysis.StopFilterFactory.create(StopFilterFactory.java:84)
	at org.apache.solr.analysis.StopFilterFactory.create(StopFilterFactory.java:43)
	at org.apache.solr.analysis.TokenizerChain.getStream(TokenizerChain.java:71)
	at org.apache.solr.analysis.SolrAnalyzer.reusableTokenStream(SolrAnalyzer.java:75)
	at org.apache.solr.schema.IndexSchema$SolrIndexAnalyzer.reusableTokenStream(IndexSchema.java:385)
	at org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:126)
	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:2056)
	at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:2030)
	at com.mysimpatico.solraddbug.SolrTest.test(SolrTest.java:45)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.rules.TestWatchman$1.evaluate(TestWatchman.java:48)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
	at org.apache.lucene.util.LuceneTestCase$LuceneTestCaseRunner.runChild(LuceneTestCase.java:1277)
	at org.apache.lucene.util.LuceneTestCase$LuceneTestCaseRunner.runChild(LuceneTestCase.java:1195)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:35)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:115)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:97)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.maven.surefire.booter.ProviderFactory$ClassLoaderProxy.invoke(ProviderFactory.java:103)
	at $Proxy0.invoke(Unknown Source)
	at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:150)
	at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcess(SurefireStarter.java:91)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:69)