Hi,

I am trying to run simple DragAndDrop example from Richfaces AS-IS. It is giving following exception during EventBean.processDrop...

Environment : jboss-4.2.3, jboss-seam-2.0.2.SP1, richfaces 3.3.3.Final

Please suggest, is it related to any configuration issue.... or what is wrong..

Here is error log, xhtml, DnDBean, EventBean and web.xml

Regards

Log :

[javax.enterprise.resource.webcontainer.jsf.lifecycle] JSF1054: (Phase ID: INVOKE_APPLICATION 5, View ID: /TestDragDrop.xhtml) Exception thrown during phase execution: javax.faces.event.PhaseEvent[source=com.sun.faces.lifecycle.LifecycleImpl@14dec09]

[org.jboss.seam.web.ExceptionFilter] handling uncaught exception

javax.servlet.ServletException: /TestDragDrop.xhtml @65,86 dropListener="#{eventBean.processDrop}": java.lang.NullPointerException

          at javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)

          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

          at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)

...

Caused by: javax.faces.el.EvaluationException: /TestDragDrop.xhtml @65,86 dropListener="#{eventBean.processDrop}": java.lang.NullPointerException

          at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)

          at org.richfaces.component.UIDropSupport.broadcast(UIDropSupport.java:63)

          at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:184)

...

Caused by: java.lang.NullPointerException

        at com.test.session.EventBean.processDrop(EventBean.java:17)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

 

package com.test.session;
import java.util.ArrayList;
import java.util.List;
import org.jboss.seam.annotations.Name;
import org.richfaces.component.Dropzone;
import org.richfaces.event.DragEvent;
import org.richfaces.event.DropEvent; 

@Name("dndBean")
public class DnDBean {
  
        public static final String DRAGLISTENER = "DragListener,"; 
          public static final String DROPLISTENER = "DropListener,"; 
          public static final String RICHDROPLISTENER = "RichDropListener,"; 
          public static final String RICHDRAGLISTENER = "RichDragListener,";
  
    private List<Framework> containerPHP;
    private List<Framework> containerCF;
    private List<Framework> containerDNET;
    private List<Framework> frameworks;
    
    private String status = "";    
    private Object dropValue;    
    private Object dragValue;    
    private Boolean rendered;
  
    public DnDBean() {
        initList();
    }
    

    public List<Framework> getContainerPHP() {
        return containerPHP;
    }

    public List<Framework> getContainerCF() {
        return containerCF;
    }

    public List<Framework> getContainerDNET() {
        return containerDNET;
    }

    public List<Framework> getFrameworks() {
        return frameworks;
    }

    public void moveFramework(Object fm, Object family) {
        List<Framework> target = null;
        if ("PHP".equals(family)) {
            target = containerPHP;
        } else if ("DNET".equals(family)) {
            target = containerDNET;
        } else if ("CF".equals(family)) {
            target = containerCF;
        }
        
        if (null != target && frameworks.contains(fm)) {
                  System.out.println("DnDBean.moveFramework, 3");
            target.add((Framework) fm);
            frameworks.remove(fm);
        }
    }


    public String reset() {
              status = "";
              dropValue = null;
              dragValue = null;
              rendered = true;
        initList();
        return null;
    }
    
    public String testRendered() {
              rendered = false;
              return null;
    }

    private void initList() {
        frameworks = new ArrayList<Framework>();
        frameworks.add(new Framework("Flexible Ajax", "PHP"));
        frameworks.add(new Framework("ajaxCFC", "CF"));
        frameworks.add(new Framework("AJAXEngine", "DNET"));
        frameworks.add(new Framework("AjaxAC", "PHP"));
        frameworks.add(new Framework("MonoRail", "DNET"));
        frameworks.add(new Framework("wddxAjax", "CF"));
        frameworks.add(new Framework("AJAX AGENT", "PHP"));
        frameworks.add(new Framework("FastPage", "DNET"));
        frameworks.add(new Framework("JSMX", "CF"));
        frameworks.add(new Framework("PAJAJ", "PHP"));
        frameworks.add(new Framework("Symfony", "PHP"));
        frameworks.add(new Framework("PowerWEB", "DNET"));


        containerPHP = new ArrayList<Framework>();
        containerCF = new ArrayList<Framework>();
        containerDNET = new ArrayList<Framework>();
    }

    public void processDropMethod(DropEvent event) {
        Dropzone dropzone = (Dropzone) event.getComponent();
        moveFramework(event.getDragValue(), dropzone.getDropValue());
        status += DROPLISTENER;
    }

    public void processDragMethod(DragEvent event) {
              event.getAcceptedTypes();
              status += DRAGLISTENER;
        dragValue = event.getDragValue();
        dropValue = event.getDropValue();
    }

    /**
     * Framework
     */
    public static class Framework {
        private String name; 
        private String family;


        public Framework(String name, String family) {
            super();
            this.name = name;
            this.family = family;
        } 

        public String getFamily() {
            return family;
        }
  
        public void setFamily(String family) {
            this.family = family;
        }
  
        public String getName() {
            return name;
        }
  
        public void setName(String name) {
            this.name = name;
        }
    }
            /**
           * @return the status
           */
          public String getStatus() {
                    return status;
          }
  
          /**
           * @param status the status to set
           */
          public void setStatus(String status) {
                    this.status = status;
          }

          /**
           * @return the dropValue
           */
          public Object getDropValue() {
                    return dropValue;
          }

         /**
           * @param dropValue the dropValue to set
           */
          public void setDropValue(Object dropValue) {
                    this.dropValue = dropValue;
          }

          /**
           * @return the dragValue
           */
          public Object getDragValue() {
                    return dragValue;
          }


          /**
           * @param dragValue the dragValue to set
           */
          public void setDragValue(Object dragValue) {
                    this.dragValue = dragValue;
          }

          public Boolean getRendered() {
                    return rendered;
          }

          public void setRendered(Boolean rendered) {
                    this.rendered = rendered;
          }

}

import org.jboss.seam.annotations.Name;
import org.richfaces.component.Dropzone;
import org.richfaces.event.DropEvent;
import org.richfaces.event.DropListener;


@Name("eventBean")
public class EventBean implements DropListener {
  
          private com.test.session.DnDBean dndBean;


          public void processDrop(DropEvent dropEvent) {
                    System.out.println("event happened");
                    Dropzone dropzone = (Dropzone) dropEvent.getComponent();
                    dndBean.moveFramework(dropEvent.getDragValue(), dropzone.getDropValue());
          }


          public com.test.session.DnDBean getDndBean() {
          return dndBean;
}


          public void setDndBean(com.test.session.DnDBean dndBean) {
                    System.out.println("bean get invoked");
          this.dndBean = dndBean;
}
}

<?xml version="1.0" ?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
         version="2.5">


    <!-- Ajax4jsf -->    
    <context-param>
        <param-name>org.richfaces.SKIN</param-name>
        <param-value>blueSky</param-value>
    </context-param>

   <!-- Seam -->    
   <listener>
      <listener-class>org.jboss.seam.servlet.SeamListener</listener-class>
   </listener>
    
    <filter>
        <filter-name>Seam Filter</filter-name>
        <filter-class>org.jboss.seam.servlet.SeamFilter</filter-class>
    </filter>


    <filter-mapping>
        <filter-name>Seam Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
        
   <servlet>
      <servlet-name>Seam Resource Servlet</servlet-name>
      <servlet-class>org.jboss.seam.servlet.SeamResourceServlet</servlet-class>
   </servlet>
    
   <servlet-mapping>
      <servlet-name>Seam Resource Servlet</servlet-name>
      <url-pattern>/seam/resource/*</url-pattern>
   </servlet-mapping>
   
   <!-- Facelets development mode (disable in production) -->   
   <context-param>
      <param-name>facelets.DEVELOPMENT</param-name>
      <param-value>true</param-value>
   </context-param>
    
   <!-- JSF -->
   <context-param>
                    <param-name>javax.faces.PARTIAL_STATE_SAVING</param-name>
                    <param-value>true</param-value>
          </context-param>


   <context-param>
      <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
      <param-value>.xhtml</param-value>
   </context-param>


   <servlet>
      <servlet-name>Faces Servlet</servlet-name>
      <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
      <load-on-startup>1</load-on-startup>
   </servlet>
    
   <servlet-mapping>
      <servlet-name>Faces Servlet</servlet-name>
      <url-pattern>*.seam</url-pattern>
   </servlet-mapping>
                  
   <security-constraint> 
       <display-name>Restrict raw XHTML Documents</display-name>
       <web-resource-collection>
           <web-resource-name>XHTML</web-resource-name>
           <url-pattern>*.xhtml</url-pattern>
       </web-resource-collection>
       <auth-constraint/>
   </security-constraint>   
</web-app>