[jboss-user] [JBoss Seam] - Could not instantiate Seam component

[hanram]

hello friends,

             Why this error will occur?  Can any one tell me proper reason..

  | org.jboss.seam.InstantiationException: Could not instantiate Seam component: WDActionWService
  | 	org.jboss.seam.Component.newInstance(Component.java:1962)
  | 	org.jboss.seam.Component.getInstance(Component.java:1865)
  | 	org.jboss.seam.Component.getInstance(Component.java:1832)
  | 	org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55)
  | 	org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50)
  | 	org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166)
  | 	org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53)
  | 	javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
  | 	com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
  | 	org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44)
  | 	org.jboss.el.parser.AstValue.getTarget(AstValue.java:34)
  | 	org.jboss.el.parser.AstValue.invoke(AstValue.java:95)
  | 	org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
  | 	com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
  | 	javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:77)
  | 	com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:91)
  | 	javax.faces.component.UICommand.broadcast(UICommand.java:383)
  | 	javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:447)
  | 	javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:752)
  | 	com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:97)
  | 	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
  | 	com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
  | 	javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
  | 	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  | 
  | 
  | root cause 
  | 
  | java.lang.NullPointerException
  | 	org.jboss.seam.example.withdrawal.WithDrawalActionWService.<init>(WithDrawalActionWService.java:32)
  | 	sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  | 	sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
  | 	sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java
  | 
  | 
  | 


thx in advance,
Han

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