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org.hibernate.exception.GenericJDBCException: Cannot open connection	at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)	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:1616)	at org.hibernate.loader.Loader.doQuery(Loader.java:717)	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)	at org.hibernate.loader.Loader.doList(Loader.java:2449)	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2192)	at org.hibernate.loader.Loader.list(Loader.java:2187)	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:452)	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363)	at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1258)