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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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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:514)	at org.hibernate.cfg.annotations.SimpleValueBinder.fillSimpleValue(SimpleValueBinder.java:516)	at org.hibernate.cfg.annotations.SimpleValueBinder.make(SimpleValueBinder.java:414)	at org.hibernate.cfg.annotations.MapBinder.bindKeyFromAssociationTable(MapBinder.java:305)	at org.hibernate.cfg.annotations.MapBinder.access$000(MapBinder.java:76)	at org.hibernate.cfg.annotations.MapBinder$1.secondPass(MapBinder.java:111)	at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:70)	at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1697)	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1426)	at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1373)	at org.hibernate.testing.junit4.BaseCoreFunctionalTestCase.afterConstructAndConfigureConfiguration(BaseCoreFunctionalTestCase.java:162)	at org.hibernate.testing.junit4.BaseCoreFunctionalTestCase.buildSessionFactory(BaseCoreFunctionalTestCase.java:126)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.hibernate.testing.junit4.TestClassMetadata.performCallbackInvocation(TestClassMetadata.java:205)