Close current tab through a button

All,
I have a weird behavior in my ADF page.
I have a method to close the current tab.
When i set this method as Action Listener for a commandMenuItem , its working fine.
But when i set this method as Action listener for a button , its throwing nullPointerException.
I am pasting below a part of the stack trace.
Can anybody please help me on this ?
<RegistrationConfigurator><handleError> Server Exception during PPR, #1
javax.servlet.ServletException
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)
 at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
 at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
 at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
 at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
 at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:191)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
 at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:421)
 at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:421)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:247)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:157)
 at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
 at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:94)
 at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
 at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:414)
 at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:138)
 at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
 at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:160)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
 at oracle.dms.wls.DMSServletFilter.doFilter(DMSServletFilter.java:330)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
 at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3684)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650)
 at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
 at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
 at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268)
 at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
 at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
 at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
 at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

John,
Here is my code to close the tab.
public void closeCurrentActivity(ActionEvent actionEvent) {
TabContext tabContext = TabContext.getCurrentInstance();
int tabIndex = tabContext.getSelectedTabIndex();
if (tabIndex != -1) {
tabContext.removeTab(tabIndex);
Am getting nullPointerException at
int tabIndex = tabContext.getSelectedTabIndex();
Thanks
Edited by: Kani on Jun 23, 2010 12:01 AM

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