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java.sql.SQLException: Connection has already been closed.	at weblogic.jdbc.wrapper.PoolConnection.checkConnection(PoolConnection.java:63)	at weblogic.jdbc.wrapper.ResultSetMetaData.preInvocationHandler(ResultSetMetaData.java:37)	at weblogic.jdbc.wrapper.ResultSetMetaData_oracle_jdbc_driver_OracleResultSetMetaData.getColumnType(Unknown Source)	at it.praxis.tim.agesp.pub.sql.PagingList.populate(PagingList.java:98)	at it.praxis.tim.agesp.pub.sql.PagingList.executeSQL(PagingList.java:53)	at jsp_servlet._jsp._todolist_new._richiesta.__listarichieste._jspService(__listarichieste.java:353)	at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)