java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.hibernate.engine.CollectionKey.(CollectionKey.java:29)
at org.hibernate.engine.CollectionLoadContext.getLoadingCollection(CollectionLoadContext.java:65)
at org.hibernate.loader.Loader.handleEmptyCollections(Loader.java:686)
at org.hibernate.loader.Loader.doQuery(Loader.java:380)

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