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From "Mervin Williams" <mwilli...@innovasolutions.net>
Subject RE: isEmpty() Method Not Working?
Date Mon, 03 Mar 2003 21:57:30 GMT
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.internalDoFilter(Applica
tionFilterChain.java:269)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:193)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:260)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:191)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
	at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticator
Base.java:550)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.ja
va:246)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.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(StandardHostValve.java
:180)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
	at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherVa
lve.java:170)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:172)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:509
)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:174)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
	at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:43
2)
	at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC
onnection(Http11Protocol.java:386)
	at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:53
4)
	at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:530)
	at java.lang.Thread.run(Thread.java:536)
2003-03-03 15:48:19,620 ERROR [org.jboss.web.localhost.Engine] -----
Root Cause -----
java.lang.NoSuchMethodError:
org.apache.struts.action.ActionMessages.isEmpty()Z
	at prototype_1.SearchAction.execute(SearchAction.java:272)
	at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr
ocessor.java:446)
	at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
266)
	at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1292)
	at
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:247)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:193)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:260)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:191)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
	at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticator
Base.java:550)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.ja
va:246)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:241
5)
	at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:180)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
	at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherVa
lve.java:170)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:172)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:509
)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
	at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:174)
	at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
	at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.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(Http11Processor.java:43
2)
	at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC
onnection(Http11Protocol.java:386)
	at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:53
4)
	at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.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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