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

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java.lang.NullPointerException:
at net.sf.hibernate.cache.SwarmCache.get(SwarmCache.java:27)
at net.sf.hibernate.cache.NonstrictReadWriteCache.get(NonstrictReadWriteCache.java:35)
at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:2033)
at net.sf.hibernate.impl.SessionImpl.doLoadByClass(SessionImpl.java:1916)

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