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org.hibernate.exception.GenericJDBCException: Could not open connection	at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)	at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:221)	at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:157)	at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.connection(StatementPreparerImpl.java:56)	at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:161)	at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:182)	at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:159)	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1859)	at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1836)	at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816)	at org.hibernate.loader.Loader.doQuery(Loader.java:900)	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)	at org.hibernate.loader.Loader.doList(Loader.java:2526)	at org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2371)	at org.hibernate.loader.Loader.list(Loader.java:2334)	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495)	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:357)	at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)	at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1275)	at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)