Subject: Re: ActionServlet and NoClassDefFoundErrors
From: Vic Cekvenich <[EMAIL PROTECTED]>
===
Should you have a new () someplace in your action?
Struts Developer wrote:
> Greetings All,
>
> This is probably a dumb question, and being this close to Friday will
> generate short flippant answers, but here goes anyway...
>
> I have a need to communicate via IBM MQSeries to a legacy application.
> This application has a listener that monitors the queue and posts events
> in the legacy application based on messages it reads from said queue.
>
> I have successfully tested putting messages on the queue from a java
> class. However when I try to call my MessageManager class from my Action
> class all I ever get is a NoClassDefFoundError.
>
> The MessageManager class imports all the necessary MQ packages, and it
> also catches all MQ exceptions and throws a "MessageManagerException"
> instead. I have a test driver that calls this class (independent of my
> ActionServlet), and I can successfully call it all day long.
>
> However, as soon as I try to make the call from my Action subclass I get
> the NoClassDefFoundError.
>
> Why, when I call my MessageManager from my test class, does it work, but
> when I call it from my Action class it fails?
>
> If anyone has any ideas please let me know. The source is posted below.
> Thanks in advance,
> Mark N.
>
> ============================
> ForteMessageManager class
> ============================
> package dhs.vcm.forte.messaging;
>
>
> import com.ibm.mq.*;
>
>
> /* There are three jar files required in the workspace
> com.ibm.mq.jar
> com.ibm.mq.iiop.jar
> com.ibm.mqbind.jar
> These should all be in the java/lib directory where MQ client is
> installed.
> The mqbind.jar file isn't used except for class definitions and was
> only
> found in the 5.2 installation of MQ Client.
> */
>
> //----------------------------------------------------- ForteMessageManager
> public class ForteMessageManager {
>
>
>
> //----------------------------------------------------- putMessage
> public static void putMessage(String msg)
> throws ForteMessageException {
>
>
> try {
>
> System.out.println("ForteMessageManager.putMessage ... about
> to establish Connection pool") ;
> ForteMessageConnectionPool messagePool = new
> ForteMessageConnectionPool();
>
> // open the queue
> System.out.println("ForteMessageManager.putMessage ... about
> to open queue") ;
> MQQueue myQueue = messagePool.getConnection(1);
>
> // Define a simple MQSeries message, and put message text
> System.out.println("ForteMessageManager.putMessage ... about
> to define message ") ;
> MQMessage myMessage = new MQMessage();
> myMessage.writeUTF(msg);
>
> // specify the message options...
> System.out.println("ForteMessageManager.putMessage ... about
> to specify message options") ;
> MQPutMessageOptions pmo = new MQPutMessageOptions(); //
> accept the defaults, use MQPMO_DEFAULT constant
>
> // put the message on the queue
> System.out.println("ForteMessageManager.putMessage ... about
> to place message on queue") ;
> myQueue.put(myMessage,pmo);
>
> // Close the queue
> System.out.println("ForteMessageManager.putMessage ... about
> to close the queue") ;
> messagePool.releaseConnection(myQueue);
>
>
> } catch (ForteMessageException ex) {
> } catch (MQException ex) {
> ForteMessageException newEx = new
> ForteMessageException(ex.getMessage());
> newEx.setCompletionCode(ex.completionCode);
> newEx.setReasonCode(ex.reasonCode);
> throw newEx;
> } catch (java.io.IOException ex) {
> throw new ForteMessageException(ex.getMessage());
> }
>
>
> }
>
>
>
> //----------------------------------------------------- getMessage
> public static String getMessage()
> throws ForteMessageException {
>
>
> String msgText = null;
>
> try {
>
> ForteMessageConnectionPool messagePool = new
> ForteMessageConnectionPool();
>
> // open the queue
> MQQueue myQueue = messagePool.getConnection(1);
>
> // Define a MQSeries message buffer to receive the message
> into..
> MQMessage retrievedMessage = new MQMessage();
>
> // Set the get message options..
> MQGetMessageOptions gmo = new MQGetMessageOptions(); //
> accept the defaults, use MQGMO_DEFAULT constant
>
> // get the message off the queue..
> myQueue.get(retrievedMessage, gmo);
>
> // set the return value
> msgText = retrievedMessage.readUTF();
>
> // Close the queue
> messagePool.releaseConnection(myQueue);
>
>
> } catch (ForteMessageException ex) {
> } catch (MQException ex) {
> ForteMessageException newEx = new
> ForteMessageException(ex.getMessage());
> newEx.setCompletionCode(ex.completionCode);
> newEx.setReasonCode(ex.reasonCode);
> throw newEx;
> } catch (java.io.IOException ex) {
> throw new ForteMessageException(ex.getMessage());
> }
>
> return msgText;
>
>
> } // end of mqTest
>
> //-----------------------------------------------------
> ForteMessageManager - end
> }
>
>
> =============================
> Action Class sample
> =============================
> package dhs.vcm.vis.action;
>
> // -------------------------------------------------------------- Java
> Includes
> import java.io.IOException;
> import java.util.Hashtable;
> import java.util.Locale;
> import javax.servlet.RequestDispatcher;
> import javax.servlet.ServletException;
> import javax.servlet.http.HttpServletRequest;
> import javax.servlet.http.HttpSession;
> import javax.servlet.http.HttpServletResponse;
>
> // --------------------------------------------------------------
> Struts Includes
> import org.apache.struts.action.ActionForm ;
> import org.apache.struts.action.ActionError;
> import org.apache.struts.action.ActionErrors;
> import org.apache.struts.action.ActionForward;
> import org.apache.struts.action.ActionMapping;
> import org.apache.struts.action.ActionServlet;
> import org.apache.struts.util.MessageResources;
>
> // -------------------------------------------------------------- DHS
> Imports
> import dhs.vcm.forte.messaging.* ;
> import dhs.vcm.vis.business.* ;
> import dhs.vcm.vis.entity.* ;
> import dhs.vcm.vis.form.* ;
> import dhs.vcm.vis.struts.action.VISAction ;
> import dhs.vcm.vis.util.* ;
>
> public class EnterVisitorActionDisplay extends VISAction {
>
> public ActionForward perform(
> ActionMapping mapping,
> ActionForm form,
> HttpServletRequest request,
> HttpServletResponse response)
> throws IOException, ServletException {
>
> writeToLog(" EnterVisitorActionDisplay : perform : entered") ;
>
> // Extract attributes we will need
> Locale locale = getLocale(request);
> MessageResources messages = getResources();
> HttpSession session = request.getSession();
>
> writeToLog(" EnterVisitorActionDisplay : perform : posting
> message") ;
>
> // Call Forte Message Manager passing it the request to display
> proper window
> messageToPost = "dhsv022910BeginRegisterVisitor" ;
> putMessageToQueue(messageToPost) ;
>
> writeToLog(" EnterVisitorActionDisplay : perform : leaving
> now") ;
>
> // Forward control to the specified success URI
> return (mapping.findForward("enterVisitor"));
> }
>
> }
>
> ============================
> Action superclass
> ============================
> package dhs.vcm.struts.action;
>
> // -------------------------------------------------------------- DHS
> imports
> import dhs.struts.action.DHSAction ;
> import dhs.vcm.forte.messaging.ForteMessageException ;
> import dhs.vcm.forte.messaging.ForteMessageManager ;
>
> import dhs.vcm.vis.business.ForteMessageProxy ;
>
> public class VCMAction extends dhs.struts.action.DHSAction {
>
> public void putMessageToQueue(
> String messageToPost) {
>
> writeToLog(" VCMAction.putMessageToQueue entered... about
> to post message") ;
>
> ForteMessageManager.putMessage(messageToPost) ;
>
> }
>
>
> public void getMessageFromQueue(){
>
> try {
> String myMsg = ForteMessageManager.getMessage();
> writeToLog(myMsg);
>
> } catch (ForteMessageException ex) {
> }
>
>
> }
>
>
> }
>
>
>
>
>
>
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