How to modify a tree component dinamically

Hi to everybody. I'm a problem with RichTree component when I try to run my application in jdeveloper 11g.
In jsp page I have a RichInputText and a button component. When you click on the button, it modifies one String type variable: it stores the same value of RichInputText component.
After that the applicatiion should show a tree that use the modified variable before, but when I click on the button an exception occurs:
javax.faces.el.EvaluationException: java.lang.NullPointerException
     at org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:51)
     at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
     at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:190)
     at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:458)
     at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:763)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication(LifecycleImpl.java:640)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:275)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:175)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at oracle.adf.share.http.ServletADFFilter.doFilter(ServletADFFilter.java:61)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:85)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:279)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._invokeDoFilter(TrinidadFilterImpl.java:239)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:196)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:139)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:149)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3496)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(Unknown Source)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2180)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2086)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: java.lang.NullPointerException
     at view.Tree_1.search(Tree_1.java:55)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at com.sun.el.parser.AstValue.invoke(AstValue.java:157)
     at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)
     at org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:46)
     ... 34 more
I show the code in the following lines:
Sense represents the tree nodes.
----------------------------------Sense.java
public class Sense {
private String _name = null;
private List<Sense> _kids = null;
public Sense(String name){
setName(name);
public String getName(){ return _name;}
public void setName(String name){this._name = name;}
public List<Sense> getKids(){ return _kids;}
public void setKids(List<Sense> kids){this._kids = kids;}
-----------------------------------Tree_1.java
public class Tree_1{
private Object _instance = null;
private transient TreeModel _model = null;
private String _key;
private RichInputText inputText1;
public RichInputText getInputText1(){return this.inputText1;}
public void setInputText1(RichInputText inputText){
this.inputText1 = inputText;
public Tree_1() {
ArrayList<Sense> root = new ArrayList<Sense>();
Sense senso = new Sense(_key);
root.add(senso);
ArrayList<Sense> firstSon = new ArrayList<Sense>();
Sense senso2 = new Sense(_key+"2");
firstSon.add(senso2);
senso.setKids(firstSon);
this.setListInstance(root);
public TreeModel getModel() throws IntrospectionException {
if (_model == null) {
model = new ChildPropertyTreeModel(instance, "kids");
return _model;
public void setListInstance(List instance) {
_instance = instance;
_model = null;
public String search() {
_key = inputText1.getValue().toString();
return null;
-------------------------------------SenseView.jsp
<af:form>
<af:inputText label="Label 1" id="inputText1"/>
<af:commandButton text="commandButton 1" action="#{Tree_1.search}"/>
<af:tree var="node" value="#{Tree_1.model}"
inlineStyle="width:100%; height:100%;">
<f:facet name="nodeStamp">
<af:outputText value="#{node.name}" />
</f:facet>
<f:facet name="pathStamp"/>
</af:tree>
</af:form>
Any ideas? thank's a lot

Hi,
what is the scope of the bean ? the command button performs a page reload after which the key is empty again
Frank

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