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[java-nlp-user] IncompatibleClassChangeError while running Stanford NER and Stanford POS tagger

John Bauer horatio at gmail.com
Fri May 13 08:09:30 PDT 2011


This is a known problem that will be fixed in a week or so.  In the
meantime, all of the necessary classes for those two libraries are in
StanfordCoreNLP,

John
On May 13, 2011 8:06 AM, "Shekhar Kotekar" <shekhar.kotekar at tcs.com> wrote:
> Hi,
> I am trying to use Stanford NER and Stanford POS tagger in one
> application. I am getting IncompatibleClassChangeError when I try to run
> POS tagger method.
> I have jar files of both NER and POS tagger in the class path. If I remove

> jar of NER from my classpath then this error is not coming. I guess there
> are some classes common in NER jar and POS jar and java is not able to
> determine which class to be used at runtime.
> Following is the stacktrace :
> java.lang.IncompatibleClassChangeError: Implementing class
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(Unknown Source)
> at java.security.SecureClassLoader.defineClass(Unknown Source)
> at java.net.URLClassLoader.defineClass(Unknown Source)
> at java.net.URLClassLoader.access$000(Unknown Source)
> at java.net.URLClassLoader$1.run(Unknown Source)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at java.lang.ClassLoader.loadClassInternal(Unknown Source)
> at
> edu.stanford.nlp.tagger.maxent.MaxentTagger.init(MaxentTagger.java:407)
> at
>
edu.stanford.nlp.tagger.maxent.MaxentTagger.readModelAndInit(MaxentTagger.java:699)
> at
>
edu.stanford.nlp.tagger.maxent.MaxentTagger.readModelAndInit(MaxentTagger.java:673)
> at
> edu.stanford.nlp.tagger.maxent.MaxentTagger.<init>(MaxentTagger.java:280)
> at
> edu.stanford.nlp.tagger.maxent.MaxentTagger.<init>(MaxentTagger.java:260)
> at
>
edu.stanford.nlp.tagger.maxent.MaxentTagger.runTagger(MaxentTagger.java:1305)
> at
> edu.stanford.nlp.tagger.maxent.MaxentTagger.main(MaxentTagger.java:1499)
> at
> com.tcs.srl.stanford.POSWrapper.executePOSTagger(POSWrapper.java:39)
> at
>
com.tcs.srl.stanford.test.POSWrapperTester.ExecutePOSTagger(POSWrapperTester.java:19)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> 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.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
> at
>
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
> 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.runners.ParentRunner.run(ParentRunner.java:236)
> at
>
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
> at
>
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> at
>
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
> at
>
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
> at
>
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
> at
>
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
>
> have no clue why this error is coming. Can anyone please help?
> If you need more details then please let me know.
>
> I saw some mails on this mailing list and found out that few people have
> faced this problem. I have downloaded and tried to use CoreNLP but when I
> add all the jar files that came with CoreNLP to project, I get
> java.io.InvalidClassException error. Following is the stacktrace:
> at
> edu.stanford.nlp.ie.AbstractSequenceClassifier.loadClassifierNoExceptions(
> AbstractSequenceClassifier.java:1224)
> at
> edu.stanford.nlp.ie.AbstractSequenceClassifier.loadClassifierNoExceptions(
> AbstractSequenceClassifier.java:1175)
> at edu.stanford.nlp.ie.crf.CRFClassifier.main(
> CRFClassifier.java:2293)
> at com.tcs.srl.stanford.NERWrapper.ExecuteNER(NERWrapper.java:105)
> at com.tcs.srl.stanford.test.NERWrapperTester.executeNER(
> NERWrapperTester.java:76)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> 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.runners.BlockJUnit4ClassRunner.runChild(
> BlockJUnit4ClassRunner.java:76)
> at org.junit.runners.BlockJUnit4ClassRunner.runChild(
> BlockJUnit4ClassRunner.java:50)
> 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.runners.ParentRunner.run(ParentRunner.java:236)
> at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(
> JUnit4TestReference.java:49)
> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(
> TestExecution.java:38)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(
> RemoteTestRunner.java:467)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(
> RemoteTestRunner.java:683)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(
> RemoteTestRunner.java:390)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(
> RemoteTestRunner.java:197)
> Caused by: java.io.InvalidClassException: edu.stanford.nlp.util.Index;
> local class incompatible: stream classdesc serialVersionUID =
> 5398562825928375260, local class serialVersionUID = 533612384823468898
> at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
> at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
> at java.io.ObjectInputStream.readClassDesc(Unknown Source)
> at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
> at java.io.ObjectInputStream.readObject0(Unknown Source)
> at java.io.ObjectInputStream.readArray(Unknown Source)
> at java.io.ObjectInputStream.readObject0(Unknown Source)
> at java.io.ObjectInputStream.readObject(Unknown Source)
> at edu.stanford.nlp.ie.crf.CRFClassifier.loadClassifier(
> CRFClassifier.java:2138)
> at edu.stanford.nlp.ie.AbstractSequenceClassifier.loadClassifier(
> AbstractSequenceClassifier.java:1093)
> at edu.stanford.nlp.ie.AbstractSequenceClassifier.loadClassifier(
> AbstractSequenceClassifier.java:1210)
> at
> edu.stanford.nlp.ie.AbstractSequenceClassifier.loadClassifierNoExceptions(
> AbstractSequenceClassifier.java:1221)
>
> Please help to use NER and POS tagger in single project.
>
> Thanks and Regards,
>
> Chandrashekhar Dilip Kotekar
>
> Tata Consultancy Services
> Cell:- 9766632117
> Mailto: shekhar.kotekar at tcs.com
> Website: http://www.tcs.com
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