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java.sql.SQLException: Connection has already been closed.	at weblogic.jdbc.wrapper.PoolConnection.checkConnection(PoolConnection.java:62)	at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:100)	at weblogic.jdbc.wrapper.Connection.prepareStatement(Connection.java:545)	at COM.FutureTense.Servlet.JDBCTable.executeUpdate_trans_logic(JDBCTable.java:1382)	at COM.FutureTense.Servlet.JDBCTable.executeUpdate_trans(JDBCTable.java:1357)	at COM.FutureTense.Servlet.JDBCTable.executeUpdate(JDBCTable.java:1231)	at COM.FutureTense.Servlet.JDBCTable.DeleteRow(JDBCTable.java:980)	at COM.FutureTense.Common.ftDBTable.deleteRow(ftDBTable.java:1117)	at COM.FutureTense.Cache.EHCacheInvalidationMemory.deleteInvalidationsBefore(EHCacheInvalidationMemory.java:255)	at COM.FutureTense.Common.CacheServer._purgeInvalidationmemory(CacheServer.java:210)	at COM.FutureTense.Common.CacheServer.flushPages(CacheServer.java:193)	at COM.FutureTense.Common.CacheServer.execute(CacheServer.java:79)	at COM.FutureTense.Servlet.FTServlet.doPost(FTServlet.java:61)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:821)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)	at com.fatwire.auth.RequestAuthenticationFilter.doFilter(RequestAuthenticationFilter.java:192)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)	at com.fatwire.wem.sso.cas.filter.CASFilter.doFilter(CASFilter.java:695)	at com.fatwire.wem.sso.SSOFilter.doFilter(SSOFilter.java:51)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)	at com.fatwire.gst.foundation.httpstatus.HttpResponseStatusFilter.doFilter(HttpResponseStatusFilter.java:83)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)