NoClassDefFoundError only for first time access

I am having a problem of NoClassDefFoundError with my EJB3 entity bean. I am calling a stateless session bean from JSF (in the @PostConstruct init method). The session bean performs:
MyEntity result = (MyEntity) em.find(MyEntity.class, priKey);
However, upon accessing the page, I have this error:
Exception occured while retrieving DTOjavax.ejb.EJBException: EJB Exception: :java.lang.NoClassDefFoundError: com/mypackage/MyEntityPK
at com.mypackage.MyEntity.pcNewObjectIdInstance(MyEntity.java)
at org.apache.openjpa.enhance.PCRegistry.newObjectId(PCRegistry.java:142)
at org.apache.openjpa.meta.MetaDataRepository.processRegisteredClass(MetaDataRepository.java:1438)
at org.apache.openjpa.meta.MetaDataRepository.processRegisteredClasses(MetaDataRepository.java:1389)
at org.apache.openjpa.meta.ClassMetaData.getPCSubclasses(ClassMetaData.java:329)
at org.apache.openjpa.meta.ClassMetaData.getPCSubclassMetaDatas(ClassMetaData.java:346)
at org.apache.openjpa.meta.ClassMetaData.getMappedPCSubclassMetaDatas(ClassMetaData.java:368)
at org.apache.openjpa.jdbc.meta.ClassMapping.getMappedPCSubclassMappings(ClassMapping.java:605)
at org.apache.openjpa.jdbc.meta.ClassMapping.getIndependentAssignableMappings(ClassMapping.java:644)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:300)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:263)
at org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
at org.apache.openjpa.datacache.DataCacheStoreManager.initialize(DataCacheStoreManager.java:336)
at org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
at org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
The weird thing is that when I tried to access the page again using another browser, the calling works and the result is returned successfully.
Has anyone experienced this problem?

Hi, did you find a durable solution to your problem, because we have seen the same situation and putting the jar file in the WebLogic lib-folder is not a solution.
Our ear-file contains an ejb jar where the entity classes are located as well.

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