NullPointer when executing JSP compiled page on JBoss AS 5.0

[spagobi]

I get the following error when executing a JSP compiled page in JBoss AS 5.0.1 (never got in JBoss 4.x) :

java.lang.NullPointerException
at org.apache.jsp.WEB_002dINF.jsp.wapp.home_jsp._jspService(home_jsp.java:1261)

here is the corresponding line code of the compiled JSP:

1261 _jsp_instancemanager.newInstance(_jspx_th_spagobiwa_005fuserMenu_005f0);

So I guess the _jsp_instancemanager is null. As far as I can get it should have been created in the _jspInit method of the servlet by the statement:

_jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());

So probably the problem comes from there.

Any configuration missing or something like that ?

[vickyk]

"spagobi" wrote:
I get the following error when executing a JSP compiled page in JBoss AS 5.0.1 (never got in JBoss 4.x) :

Paste the contents of the simple sample jsp here which will simulate the issue.

[egwada]

Hi All!

Just to contribute on this trouble. The exception come from the call of a spapbi tag :

<spagobiwa:userMenu viewTrackPath='<%=viewTrackPath%>'/>

The generated java codes are :

 // spagobiwa:userMenu
 it.eng.spagobi.commons.presentation.tags.UserMenuTag _jspx_th_spagobiwa_005fuserMenu_005f0 = (new it.eng.spagobi.commons.presentation.tags.UserMenuTag());
 _jsp_instancemanager.newInstance(_jspx_th_spagobiwa_005fuserMenu_005f0);
 _jspx_th_spagobiwa_005fuserMenu_005f0.setPageContext(_jspx_page_context);
 _jspx_th_spagobiwa_005fuserMenu_005f0.setParent(null);
 // /WEB-INF/jsp/wapp/home.jsp(569,2) name = viewTrackPath type = null reqTime = true required = false fragment = false deferredValue = false expectedTypeName = null deferredMethod = false methodSignature = null
 _jspx_th_spagobiwa_005fuserMenu_005f0.setViewTrackPath(viewTrackPath);
 int _jspx_eval_spagobiwa_005fuserMenu_005f0 = _jspx_th_spagobiwa_005fuserMenu_005f0.doStartTag();
 if (_jspx_th_spagobiwa_005fuserMenu_005f0.doEndTag() == javax.servlet.jsp.tagext.Tag.SKIP_PAGE) {
 _jspx_th_spagobiwa_005fuserMenu_005f0.release();
 _jsp_instancemanager.destroyInstance(_jspx_th_spagobiwa_005fuserMenu_005f0);
 return;
 }
 _jspx_th_spagobiwa_005fuserMenu_005f0.release();
 _jsp_instancemanager.destroyInstance(_jspx_th_spagobiwa_005fuserMenu_005f0);

I hope that can help you to imagine what happen. I try to find the code of the SpagoBI tag libray to put it here.

Best regards.

[jsipher]

I ran into this upgrading from 4.2.3 to 5.1.0. The problem pages all extend a common base class, and I changed the base class's jspInit() method to to check whether there's a _jspInit() method and, if so, call it.

    public void jspInit() {
        try {
            Method _jspInit = this.getClass().getMethod("_jspInit", (Class[])null);
            try {
                _jspInit.invoke(this, (Object[])null);
            } catch (Exception e) {
                _log.error("Exception invoking _jspInit",e);
            }
        } catch (NoSuchMethodException ignored) {
        }
    }

It doesn't seem like I should need to do that, and I'd appreciate knowing the "correct" fix if anyone knows what it is.