tree struts : java.lang.ClassCastException

Version imprimable

salut

j'ai rencontrer lors de la creation de mon arbre un probleme d'execution
voila la trace d'erreur :

Code:

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java.lang.ClassCastException: com.cap.tree.action.ProductTreeBrowseAction
	at org.apache.struts.action.RequestProcessor.processActionCreate(RequestProcessor.java:280)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:218)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
	at java.lang.Thread.run(Unknown Source)

si qlq a deja rencontrer un probleme pareil ou il a une idée peu m'aidé

merci d'avance

08/05/2007, 17h37
c_nvy

Ben, comme l'indique le message d'erreur, c'est un problème de cast.
Avec le code de l'Action ProductTreeBrowseAction, on pourra peut-être t'aider.;)

Salut

Merci pour votre interet
voila mon Action

Code:

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package com.cap.tree.action;
 
 
import java.util.Hashtable;
import com.cc.framework.adapter.struts.ActionContext;
import com.cc.framework.adapter.struts.FormActionContext;
import com.cc.framework.common.Algorithm;
import com.cc.framework.common.CheckState;
import com.cc.framework.ui.control.ControlActionContext;
import com.cc.framework.ui.control.TreeControl;
import com.cc.framework.ui.model.Checkable;
import com.cc.framework.ui.model.TreeNodeDataModel;
import com.cc.framework.util.TreeHelp;
import com.cc.sample.action.CCAction;
import com.cc.sample.common.Forwards;
import com.cc.sample.common.Messages;
import com.cc.sample.dbaccess.DBProduct;
import com.cc.sample.presentation.dsp.ProductGroupDsp;
 
/**
 * This Class is responsible to instantiate our TreeControl.
 * This Class also implements the Methode which are called if
 * an Event in our TreeControl occurs.
 *
 * @author              <a href="mailto:gschulz@scc-gmbh.com">Gernot Schulz</a>
 * @version     $Revision: 1.7 $
 */
public class ProductTreeBrowseAction extends CCAction {
 
	/**
         * The name of the bean for our control in the session
         */
	protected String BEANNAME;
 
	/**
         * Inner class which checks the checked items
         */
	private static class CollectCheckedAlg implements Algorithm {
 
		/**
                 * Collection for the checked items found
                 */
		private Hashtable items = new Hashtable();
 
		/**
                 * Constructor
                 */
		public CollectCheckedAlg() {
 
			super();
		}
 
		/**
                 * @see com.cc.framework.common.Algorithm#execute(String uniqueId, Object obj)
                 */
		public boolean execute(String uniqueId, Object obj) throws Exception {
						if (obj instanceof Checkable) {
				TreeNodeDataModel node = (TreeNodeDataModel) obj;
				Checkable checkable = (Checkable) obj;
 
				if (checkable.getCheckState() == CheckState.CHECKED.toInt()) {
					items.put(node.getUniqueKey(), obj);								
				}
			}
 
			return true;
		}
 
		/**
                 * Returns the checked items
                 */
		public Hashtable getcheckedItems() {
			return items;
		}
	}
 
 
 
	// ----------------------------------
	//           methods
	// ----------------------------------
 
	/**
         * Constructor for StocksBrowseAction.
         */
	public ProductTreeBrowseAction() {
		super();		
		BEANNAME = "products";
	}
 
	/**
         * @see com.cc.framework.adapter.struts.FrameworkAction#doExecute(com.cc.framework.adapter.struts.ActionContext)
         */
	public void doExecute(ActionContext ctx) throws Exception {
 
		try {
			refreshTree(ctx);
		} catch (Throwable t) {
			log.error("Error", t);
 
			ctx.addError(Messages.ERROR_INIT_FORMBEAN, t);
		}
 
		// Dialog anzeigen
		ctx.forwardToInput();		
	}
 
	/**
         * Initializ the Tree with the Display-Data
         * @param               ctx             ActionContext
         * @throws      java.lang.Exception
         */
	private void refreshTree(ActionContext ctx) throws Exception {
 
		// In this Example we check if the Tree already
		// exists, so we do not populte it again.
		// So the Tree does not collaps if we reenter the Page
		if (null != ctx.session().getAttribute(BEANNAME)) {
			return;
		} 
 
		// first we get the Data for our Tree
		ProductGroupDsp data = DBProduct.fetch();
 
		// secondly create the TreeControl and populate it
		// with the Data to display
		TreeControl products = new TreeControl();
		products.setDataModel(data);
 
		// third put the TreeControl into the Session-Object.
		// Our Control is a statefull Object.
		// Normaly  you can use an Objectmanager or an other
		// workflow Component that manage the Livecyle of the
		// our TreeControl-Object.
		ctx.session().setAttribute(BEANNAME, products);
	}
 
 
	// ------------------------------------------------
	//          Tree-Control  Event Handler
    // ------------------------------------------------
 
	/**
         * This Method is called when the TreeLabel is clicked 
         * In our Example we switch to the DetailView, which shows
         * more Information about the node.
         * @param       ctx             ControlActionContext
         * @param       key     UniqueKey, as created in the Datamodel (e.g. the Primarykey)
         */
	public void  products_onDrilldown(ControlActionContext ctx, String key) throws Exception {
 
		// highlight the node
		((TreeControl) ctx.control()).select(key);
 
		ctx.forwardByName(Forwards.DRILLDOWN, key);
	}
 
	/**
         * This Method is call if a Node with an unknown number of 
         * Childs is clicked.
         * @param       ctx             ControlActionContext
         * @param       key     UniqueKey, as created in the Datamodel (e.g. the Primarykey)
         */
	public void products_onExpandEx(ControlActionContext ctx, String key) throws Exception {
			}
 
	/**
         * This Method is call if the save button is clicked
         * @param ctx FormActionContext
         */
	public void save_onClick(FormActionContext ctx) throws Exception {
 
		Hashtable items = new Hashtable(); 
 
		try {
 
			TreeControl control = (TreeControl) ctx.session().getAttribute(BEANNAME);
 
			CollectCheckedAlg collector = new CollectCheckedAlg();
 
			TreeHelp.iterateNodes((TreeNodeDataModel)control.getDataModel(), collector);
 
			items = collector.getcheckedItems();
 
			// process items
 
		} catch (Throwable t) {
			log.error("Error", t);
			ctx.addError(Messages.ERROR, t);
		}
 
		if (!ctx.hasErrors()) {
			ctx.addGlobalMessage(Messages.MESSAGE, "Items checked: " + items.size());
		}
 
		// back to the jsp
		ctx.forwardToInput();
	}
 
 
 
 
}

Merci d'avance

15/05/2007, 20h33
addeel2002

salut

j'attend tjr de votre aide c urgent

merci d'avance
15/05/2007, 22h32
c_nvy
Je ne connais pas cet API mais ici, il y a quelque chose qui me choque :
Code:

1 2 TreeNodeDataModel node = (TreeNodeDataModel) obj; Checkable checkable = (Checkable) obj;
tu castes le même objet par deux classes différentes.