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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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via Hibernate JIRA by Janario Oliveira, 1 year ago
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java.lang.NullPointerException: 	at java.util.Hashtable.put(	at org.hibernate.cfg.annotations.SimpleValueBinder.fillSimpleValue(	at org.hibernate.cfg.annotations.SimpleValueBinder.make(	at org.hibernate.cfg.annotations.MapBinder.bindKeyFromAssociationTable(	at org.hibernate.cfg.annotations.MapBinder.access$000(	at org.hibernate.cfg.annotations.MapBinder$1.secondPass(	at org.hibernate.cfg.CollectionSecondPass.doSecondPass(	at org.hibernate.cfg.Configuration.originalSecondPassCompile(	at org.hibernate.cfg.Configuration.secondPassCompile(	at org.hibernate.cfg.Configuration.buildMappings(	at org.hibernate.testing.junit4.BaseCoreFunctionalTestCase.afterConstructAndConfigureConfiguration(	at org.hibernate.testing.junit4.BaseCoreFunctionalTestCase.buildSessionFactory(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at org.hibernate.testing.junit4.TestClassMetadata.performCallbackInvocation(