com.sun.enterprise.InvocationException: This exception has no message.

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com.sun.enterprise.InvocationException: 	at com.sun.enterprise.resource.PoolManagerImpl.getResource(PoolManagerImpl.java:134)	at com.sun.enterprise.resource.JdbcDataSource.internalGetConnection(JdbcDataSource.java:241)	at com.sun.enterprise.resource.JdbcDataSource.getConnection(JdbcDataSource.java:98)	at com.samsung.sds.pdss.fw.db.DAO.getConnection(DAO.java:41)	at ghr.fw.user.CurrentUserDAO.delete(CurrentUserDAO.java:111)	at ghr.fw.user.SessionListener.valueUnbound(SessionListener.java:53)	at org.apache.catalina.session.StandardSession.removeAttribute(StandardSession.java:1116)	at org.apache.catalina.session.StandardSession.expire(StandardSession.java:611)	at org.apache.catalina.session.StandardManager.processExpires(StandardManager.java:755)	at org.apache.catalina.session.StandardManager.run(StandardManager.java:832)	at java.lang.Thread.run(Thread.java:536)