javax.ejb.EJBException: This exception has no message.

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javax.persistence.EntityExistsException: Exception Description: The method [_toplink_getcountry_vh] on the object [cz.qds.lazyexample.ebs.Company] triggered an exception. Internal Exception: java.lang.reflect.InvocationTargetException Target Invocation Exception: java.lang.NullPointerException Mapping: oracle.toplink.essentials.mappings.OneToOneMapping[country] Descriptor: RelationalDescriptor(cz.qds.lazyexample.ebs.Company --> [DatabaseTable(COMPANY)])
at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.persist(
at com.sun.enterprise.util.EntityManagerWrapper.persist(
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
at java.lang.reflect.Method.invoke(
at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(
at com.sun.ejb.containers.BaseContainer.intercept(
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(

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