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From "Ditlinger, Steve" <SDitlin...@ebuilt.com>
Subject RE: isEmpty() Method Not Working?
Date Mon, 03 Mar 2003 22:03:03 GMT

NoSuchMethodError does not extend Exception, so if you are catching
Exception, the catch block will not be entered.  

However, your real problem is that you are compiling against a current
version of Struts and then running against an obsolete version of Struts.

HTH,
Steve

 -----Original Message-----
 From: Mervin Williams [mailto:mwilliams@innovasolutions.net]
 Sent: Monday, March 03, 2003 1:58 PM
 To: 'Struts Users Mailing List'
 Subject: RE: isEmpty() Method Not Working?
 
 
 I put a try/catch block around the "if(!errors.isEmpty())" 
 call, but the
 catch block was never entered, and the exception occurred.  
 Below is the
 stack trace for the error.  
 
 I do notice something strange in the stack tracke: in the "Root Cause"
 portion of the stack trace, the NoSuchMethodError refers to a method
 named "ActionMessages.isEmpty()Z".  Where is the "Z" coming from - I do
 not have a "Z" at the end of my method call.
 
 --------------------------------------
 2003-03-03 15:48:18,909 ERROR [org.jboss.web.localhost.Engine]
 StandardWrapperValve[action]: Servlet.service() for servlet 
 action threw
 exception
 javax.servlet.ServletException: Servlet execution threw an exception
 	at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilte
 r(Applica
 tionFilterChain.java:269)
 	at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(Applic
 ationFilt
 erChain.java:193)
 	at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWr
 apperValv
 e.java:260)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:643)
 	at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeli
 ne.java:4
 80)
 	at
 org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 	at
 org.apache.catalina.core.StandardContextValve.invoke(StandardCo
 ntextValv
 e.java:191)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:643)
 	at
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(Auth
 enticator
 Base.java:550)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.valves.CertificatesValve.invoke(Certificate
 sValve.ja
 va:246)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeli
 ne.java:4
 80)
 	at
 org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 	at
 org.apache.catalina.core.StandardContext.invoke(StandardContext
 .java:241
 5)
 	at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostV
 alve.java
 :180)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:643)
 	at
 org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDis
 patcherVa
 lve.java:170)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportV
 alve.java
 :172)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve
 .java:509
 )
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeli
 ne.java:4
 80)
 	at
 org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 	at
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEng
 ineValve.
 java:174)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:643)
 	at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeli
 ne.java:4
 80)
 	at
 org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 	at
 org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
 	at
 org.apache.coyote.http11.Http11Processor.process(Http11Processo
 r.java:43
 2)
 	at
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler
 .processC
 onnection(Http11Protocol.java:386)
 	at
 org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoin
 t.java:53
 4)
 	at
 org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(T
 hreadPool
 .java:530)
 	at java.lang.Thread.run(Thread.java:536)
 2003-03-03 15:48:19,620 ERROR [org.jboss.web.localhost.Engine] -----
 Root Cause -----
 java.lang.NoSuchMethodError:
 org.apache.struts.action.ActionMessages.isEmpty()Z
 	at prototype_1.SearchAction.execute(SearchAction.java:272)
 	at
 org.apache.struts.action.RequestProcessor.processActionPerform(
 RequestPr
 ocessor.java:446)
 	at
 org.apache.struts.action.RequestProcessor.process(RequestProces
 sor.java:
 266)
 	at
 org.apache.struts.action.ActionServlet.process(ActionServlet.java:1292)
 	at
 org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 	at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilte
 r(Applica
 tionFilterChain.java:247)
 	at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(Applic
 ationFilt
 erChain.java:193)
 	at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWr
 apperValv
 e.java:260)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:643)
 	at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeli
 ne.java:4
 80)
 	at
 org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 	at
 org.apache.catalina.core.StandardContextValve.invoke(StandardCo
 ntextValv
 e.java:191)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:643)
 	at
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(Auth
 enticator
 Base.java:550)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.valves.CertificatesValve.invoke(Certificate
 sValve.ja
 va:246)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeli
 ne.java:4
 80)
 	at
 org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 	at
 org.apache.catalina.core.StandardContext.invoke(StandardContext
 .java:241
 5)
 	at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostV
 alve.java
 :180)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:643)
 	at
 org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDis
 patcherVa
 lve.java:170)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportV
 alve.java
 :172)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve
 .java:509
 )
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:641)
 	at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeli
 ne.java:4
 80)
 	at
 org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 	at
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEng
 ineValve.
 java:174)
 	at
 org.apache.catalina.core.StandardPipeline$StandardPipelineValve
 Context.i
 nvokeNext(StandardPipeline.java:643)
 	at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeli
 ne.java:4
 80)
 	at
 org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 	at
 org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
 	at
 org.apache.coyote.http11.Http11Processor.process(Http11Processo
 r.java:43
 2)
 	at
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler
 .processC
 onnection(Http11Protocol.java:386)
 	at
 org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoin
 t.java:53
 4)
 	at
 org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(T
 hreadPool
 .java:530)
 	at java.lang.Thread.run(Thread.java:536)
 
 -----Original Message-----
 From: p2 - apache [mailto:apachep2@hotmail.com] 
 Sent: Monday, March 03, 2003 3:01 PM
 To: 'Struts Users Mailing List'
 Subject: RE: isEmpty() Method Not Working?
 
 
 Can you put a try/catch block around your if (!errors... Let's see if
 this is where the exception is thrown.
 
 -----Original Message-----
 From: Mervin Williams [mailto:mwilliams@innovasolutions.net] 
 Sent: March 3, 2003 3:45 PM
 To: struts-user@jakarta.apache.org
 Subject: FW: isEmpty() Method Not Working?
 
 Every time my application encounters the ActionErrors 
 isEmpty() message,
 a Servlet Exception occurs.  I simply replaced the old call from
 "errors.empty()" to "errors.isEmpty()".  If anyone has ideas as to
 what's going on, please help!
 
 Here is my code:
 --------------------------------------
            try
            {
                 if (stmt != null)
                 {
                   stmt.close();
                 }
                 if (conn != null)
                 {
                   conn.close();
                 }
            }
            catch(Exception e)
            {
              target = "error";
              ActionErrors errors = new ActionErrors();
              errors.add(ActionErrors.GLOBAL_ERROR, new
 ActionError("errors.database.error", e.getMessage()));
 
              // Report any errors
               if(!errors.isEmpty())
               {
                saveErrors(req, errors);
               }
            }
 
 
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