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org.hibernate.exception.GenericJDBCException: Cannot open connection	at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)	at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)	at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161)	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1577)	at org.hibernate.loader.Loader.doQuery(Loader.java:696)	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)	at org.hibernate.loader.Loader.loadCollectionBatch(Loader.java:2057)	at org.hibernate.loader.collection.BatchingCollectionInitializer.initialize(BatchingCollectionInitializer.java:70)	at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:587)	at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)	at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1744)	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:366)	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)	at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:272)