NPE when releasing application module instance

HI,
I am hitting a NPE when I am trying to release my application module.
My code goes like this.
public void releaseAppModule() {
     try {
          super.releaseRootAppModule(false);
     } catch (Exception e) {
          e.printStackTrace();
}...and the exception
java.lang.NullPointerException
at oracle.jbo.client.Configuration.releaseRootApplicationModule(Configuration.java:1435)Use Case:
I am getting my data from DB.
1. On first load, I will hit this NPE
2. When I do refresh on the browser, I no longer am experiencing this.
Any reason why?
How do I troubleshoot such case?
JDEV 11G PS3

i think this will helps you.
JBO-30006 / BEA-000000 in ADF BC when running production

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Application pool unable to check out application module instance in TOMCAT!

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I am able to run my bc4j application (WITH jsp CLIENTS) in JDEVELOPER just fine. But when I deploy it to TOMCAT, it gives me an error :
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Chris, Here's the complete error message that I am receiving when I attempt to call the JSP page. I infact re-installed tomcat just to make sure that I don't have any old files that my application is referring to. So right now , I have only one application.
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Internal Servlet Error:
javax.servlet.ServletException: oracle.jbo.common.ampool.ApplicationPoolException: JBO-30003: The application pool, WoopsModule, failed to checkout an application module instance.
oracle.jbo.ApplicationModule oracle.jbo.html.jsp.JSPApplicationRegistry.getAppModuleInstance(java.lang.String, javax.servlet.jsp.PageContext)
int oracle.jbo.html.jsp.datatags.ApplicationModuleTag.doEndTag()
void _0002fiss_0005fListPerson_0002ejspiss_0005fListPerson_jsp_0._jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void org.apache.jasper.runtime.HttpJspBase.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, boolean)
void org.apache.jasper.servlet.JspServlet.serviceJspFile(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String, java.lang.Throwable, boolean)
void org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(org.apache.tomcat.service.TcpConnection, java.lang.Object[])
void org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
void java.lang.Thread.run()
## Detail 0 ##
oracle.jbo.NoDefException: JBO-25002: Definition WoopsBC4J.WoopsBC4JModule of type ApplicationModule not found
oracle.jbo.ApplicationModule oracle.jbo.html.jsp.JSPApplicationRegistry.getAppModuleInstance(java.lang.String, javax.servlet.jsp.PageContext)
int oracle.jbo.html.jsp.datatags.ApplicationModuleTag.doEndTag()
void _0002fiss_0005fListPerson_0002ejspiss_0005fListPerson_jsp_0._jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void org.apache.jasper.runtime.HttpJspBase.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, boolean)
void org.apache.jasper.servlet.JspServlet.serviceJspFile(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String, java.lang.Throwable, boolean)
void org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(org.apache.tomcat.service.TcpConnection, java.lang.Object[])
void org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
void java.lang.Thread.run()
void org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(org.apache.tomcat.service.TcpConnection, java.lang.Object[])
void org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
void java.lang.Thread.run()
Root cause:
javax.servlet.jsp.JspException: oracle.jbo.common.ampool.ApplicationPoolException: JBO-30003: The application pool, WoopsModule, failed to checkout an application module instance.
oracle.jbo.ApplicationModule oracle.jbo.html.jsp.JSPApplicationRegistry.getAppModuleInstance(java.lang.String, javax.servlet.jsp.PageContext)
int oracle.jbo.html.jsp.datatags.ApplicationModuleTag.doEndTag()
void _0002fiss_0005fListPerson_0002ejspiss_0005fListPerson_jsp_0._jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void org.apache.jasper.runtime.HttpJspBase.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, boolean)
void org.apache.jasper.servlet.JspServlet.serviceJspFile(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String, java.lang.Throwable, boolean)
void org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(org.apache.tomcat.service.TcpConnection, java.lang.Object[])
void org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
void java.lang.Thread.run()
## Detail 0 ##
oracle.jbo.NoDefException: JBO-25002: Definition WoopsBC4J.WoopsBC4JModule of type ApplicationModule not found
oracle.jbo.ApplicationModule oracle.jbo.html.jsp.JSPApplicationRegistry.getAppModuleInstance(java.lang.String, javax.servlet.jsp.PageContext)
int oracle.jbo.html.jsp.datatags.ApplicationModuleTag.doEndTag()
void _0002fiss_0005fListPerson_0002ejspiss_0005fListPerson_jsp_0._jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void org.apache.jasper.runtime.HttpJspBase.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, boolean)
void org.apache.jasper.servlet.JspServlet.serviceJspFile(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String, java.lang.Throwable, boolean)
void org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(org.apache.tomcat.service.TcpConnection, java.lang.Object[])
void org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
void java.lang.Thread.run()
void org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(org.apache.tomcat.service.TcpConnection, java.lang.Object[])
void org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
void java.lang.Thread.run()

Accessing application module instances directly from the AMPool

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Message was edited by:
user506477

Sure, we are having RAM problems, sometimes, and for reasons that are still unclear, a process begins to consume memory.
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Hi all,
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null

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thanks Puthanampatti ,
This is working and i am able to get AM instance from this , But i am not sure what is the difference between:
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Referred methods:
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     * Method for taking a reference to a JSF binding expression and returning
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     * @param expression EL expression
     * @return Managed object
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        FacesContext facesContext = getFacesContext();
        Application app = facesContext.getApplication();
        ExpressionFactory elFactory = app.getExpressionFactory();
        ELContext elContext = facesContext.getELContext();
        ValueExpression valueExp =
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        return valueExp.getValue(elContext);
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    public ComplianceLibraryAMImpl getDataControl() {
                 DCBindingContainer bc = (DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
                 ApplicationModule am = bc.findDataControl(DATA_CONTROLLER).getApplicationModule();
                 return (ComplianceLibraryAMImpl)am;
    }Why am i not able to find my data control AM from Binding Container????

Release Application Module

Guys,
I couldn't understand the exact difference between
Configuration.releaseRootApplicationModule(am, true);
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2. False -> AM intance will not be deleted and when i do am = Configuration.createRootApplicationModule(amDef, config) , i will get the same am instance?
Can you guys help?

Straight from the docs:
releaseRootApplicationModulepublic static void releaseRootApplicationModule(ApplicationModule appModule,
boolean remove)
Release the specified application module.
Parameters:
appModule - an application module which was created with createRootApplicationModule(String, String, EnvInfoProvider)
remove - indicates whether the application module should be removed true: remove the application module false: retain the application module for future use
>
BUT read this http://radio-weblogs.com/0118231/2009/08/20.html#a959 and ask yourself why using createRootApplicationModule in the first place.
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How to get application module instance from java bundle?

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I would like to build an application that would get all translations from a database table.
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Then I created java bundle classes to get translations for specific language. Then I tried to override public Object[][] getContents() method.
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So what is the right way to get application module from java bundle file? Now everytime application wants to get translations, application stops and displays NPE message.
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I use JDeveloper 11.1.2.1.0

Marko,
you can't just instantiate an application module. An application module has to be set up, db connections and memory pools have to be initialized and ....
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This blog may be what you are looking for http://technology.amis.nl/2012/08/10/implement-resource-bundles-for-adf-applications-in-a-database-table/
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This is Ramesh, I am new to JDeveloper world.
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If your page has no page definition, then #{bindings} will be null during the request for that page.
If you need your page to invoke a data control method when you press a button, the simplest (and declarative) way is publish your AM method on the AM's client interface, then drop the method as a button from the data control palette onto your page. You don't even need a backing bean to accomplish this.
That said, you can refer to a data control in a backing bean using the expression #{data.[i]YourAppModuleNameDataControl.dataProvider}
So, assuming you have a helper method like this:
public static Object EL(String expression) {
    FacesContext ctx = getFacesContext();
    Application app = ctx.getApplication();
    ValueBinding bind = app.createValueBinding(expression);
    return bind.getValue(ctx);
}and assuming that your application module is named SRService
and assuming that you have correctly nominated any Application Module custom methods as being available to clients by selecting them on the "Client Interface" panel of the application module editor, then in a backing bean you can acquire an instance.
Then, the ADF design time will have automatically generated you a custom AM client interface named SRService and you can reference that service interface in your backing bean by using code like this:
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When the application module starts the trans?

Hi,
For ADF application module, when does it start a trans?Is it the case the AM method(even read only method) exposed to view layer, then the trans starts automatically when the page is loaded? Or when getDBTransaction() is called? or even latter when actual update or some specific method is called from the trans? Just wondering whether a commit/rollback is expected when even an exposed method is called by view layer even it is readonly.
Hui

Thx, Tim.
We are use optimistic in the AMs. We have some AMs just do data query. But there is VPD on one of the table, query on the table will trigger the VPD table updates from database, and if db side detects the parent query sql has transaction associated, the vpd related update will not be committed and expects the parent trans will be commit/rollback But if the AM is cached, and no explicit commit/rolback was issued. Will the underlying VPD updates stay there not commit/rollback
Hui

Application Module instance...

Hi ,
I face a very strange/interesting issue as follows,
I have a class which extends the ApplicationModuleImp to overrides the prepareSession and beforeDisconnect methods say class X . And I have made all the app modules to extend this class. The thing is I find too many times the prepareSession methos is called.
When I used the SOP to print the class names, I found that when other appmodules get instantiated, this Class X is also made to instantiate and call prepareSession method even though it is not an app module by itself.
Can anyone explain the reason for this behavior or is it a issue........... ?

Vijai,
You must be doing something different then - here is my test case:
public class X
extends ApplicationModuleImpl
public X()
    super();
@Override
protected void prepareSession(Session session)
    System.out.println("*******name********* (in superclass)" + this.getClass().getName());
    System.out.println("****obj*****" + this);
    super.prepareSession(session);
public class AppModuleImpl
extends X
   * This is the default constructor (do not remove).
public AppModuleImpl()
   * Container's getter for CountriesView1.
   * @return CountriesView1
public ViewObjectImpl getCountriesView1()
    return (ViewObjectImpl) findViewObject("CountriesView1");
@Override
protected void prepareSession(Session session)
    System.out.println("*******name*********" + this.getClass().getName());
    System.out.println("****obj*****" + this);
    super.prepareSession(session);
}And the result:
*******name*********model.AppModuleImpl
****obj*****model.AppModuleImpl@3253be7c
*******name********* (in superclass)model.AppModuleImpl
****obj*****model.AppModuleImpl@3253be7c
John

NPE when releasing application module instance

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