Blocker Description
There is already similar issue which is claiming that it is fixed/closed:
https://issues.apache.org/jira/browse/OPENEJB-1116
I tried adding comment to the same, but as I have not received any reply so far, I am reporting this bug.
I am facing issue while trying to setup unit test environment for testing my ejbs with openEJB.
I tried with openEJB 3.1.3, 3.1.4 and 4.0.0-beta-1, but no luck 
!
As we were planning to setup openEJB for unit testing, this is completely blocker for us.
Following is the exception statck I am getting while trying to test my EJBs. Any stateless EJB that I try to test, it always fails for one Entity bean (Grid)
javax.ejb.EJBException: The bean encountered a non-application exception; nested exception is:
java.lang.ClassFormatError: Duplicate method name&signature in class file org/apache/openjpa/enhance/com$novomind$ipim$qvc$core$persistence$entities$Grid$pcsubclass
at org.apache.openejb.core.ivm.BaseEjbProxyHandler.convertException(BaseEjbProxyHandler.java:359)
at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:287)
at $Proxy49.getArticleById(Unknown Source)
at com.novomind.ipim.qvc.core.businesslogic.TestCommonSessionBean.testGetFeatureStatusList(TestCommonSessionBean.java:48)
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 junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:91)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.ClassFormatError: Duplicate method name&signature in class file org/apache/openjpa/enhance/com$novomind$ipim$qvc$core$persistence$entities$Grid$pcsubclass
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
at serp.bytecode.BCClassLoader.findClass(BCClassLoader.java:50)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.openjpa.util.GeneratedClasses.loadBCClass(GeneratedClasses.java:67)
at org.apache.openjpa.enhance.ManagedClassSubclasser.write(ManagedClassSubclasser.java:265)
at org.apache.openjpa.enhance.ManagedClassSubclasser.access$000(ManagedClassSubclasser.java:55)
at org.apache.openjpa.enhance.ManagedClassSubclasser$1.write(ManagedClassSubclasser.java:125)
at org.apache.openjpa.enhance.PCEnhancer.record(PCEnhancer.java:592)
at org.apache.openjpa.enhance.PCEnhancer.record(PCEnhancer.java:580)
at org.apache.openjpa.enhance.ManagedClassSubclasser.prepareUnenhancedClasses(ManagedClassSubclasser.java:147)
at org.apache.openjpa.kernel.AbstractBrokerFactory.loadPersistentTypes(AbstractBrokerFactory.java:310)
at org.apache.openjpa.kernel.AbstractBrokerFactory.initializeBroker(AbstractBrokerFactory.java:228)
at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:190)
at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:142)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:192)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:56)
at org.apache.openejb.persistence.JtaEntityManagerRegistry.getEntityManager(JtaEntityManagerRegistry.java:105)
at org.apache.openejb.persistence.JtaEntityManager.getEntityManager(JtaEntityManager.java:72)
at org.apache.openejb.persistence.JtaEntityManager.find(JtaEntityManager.java:137)
at com.novomind.ipim.qvc.core.businesslogic.CommonSessionBean.getArticleById(CommonSessionBean.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:162)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:144)
at com.jamonapi.aop.JAMonEJBInterceptor.intercept(JAMonEJBInterceptor.java:26)
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.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:162)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:144)
at org.apache.openejb.monitoring.StatsInterceptor.record(StatsInterceptor.java:164)
at org.apache.openejb.monitoring.StatsInterceptor.invoke(StatsInterceptor.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:162)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:144)
at org.apache.openejb.core.interceptor.InterceptorStack.invoke(InterceptorStack.java:122)
at org.apache.openejb.core.stateless.StatelessContainer._invoke(StatelessContainer.java:221)
at org.apache.openejb.core.stateless.StatelessContainer.invoke(StatelessContainer.java:174)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java:217)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:77)
at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:282)
As its very urgent for me, early response to this is highly appreciated.
Many Thanks