Question

I’m now trying to learn Oracle ADF and I’m getting a NullPointerException while running the following code on a Java bean.
Can you help me figure out what I’m doing wrong please? This is being invoked from a button on a JSPX page.

public String cb1_action() {
    try{
        BindingContext bindingctx = BindingContext.getCurrent();
        BindingContainer bindings = bindingctx.getCurrentBindingsEntry();
        DCBindingContainer bindingsImpl = (DCBindingContainer)bindings;
        DCIteratorBinding iter = bindingsImpl.findIteratorBinding("ViewObj1Iterator");


        Row row = iter.getCurrentRow();

        row.setAttribute("Id", 123);
        row.setAttribute("Nome", "Pedro Teste");

    }
    catch(Exception e) {
        System.out.println("Excepcao em: ");
        e.printStackTrace();
    }

    return null;
}

According to the Stack trace, the error occurs on the first row.setAttribute() line.
Also, I’m using the latest version of JDeveloper with the integrated WebLogic server.

Best regards,

Pedro

Answer 1

Ok, so here’s how I figured out how to get around this:

First, I asked jDeveloper to generate a class for the Application Module.
In that class, I added the following methods:

public void testEntityObject()
{
    System.out.println("Let's try our Entity Object...");

    try
    {
        EntityDefImpl entity = TesteEOImpl.getDefinitionObject();
        TesteEOImpl ti = (TesteEOImpl)entity.createInstance2(getDBTransaction(), null);
        ti.setId(new BigDecimal(123));
        ti.setNome("Entity Object test...");

        getDBTransaction().commit();

        System.out.println("Looks good :-)");
    }
    catch(Exception e) 
    {
        System.out.println("It seems something went wrong :-(");
        e.printStackTrace();
    }
}

public void testViewObject() {
    System.out.println("Let's try our View Object...");

            ViewObjectImpl vo = this.getTeste1();

        try{
            Row row = vo.createRow();
            row.setAttribute("Id", 234);
            row.setAttribute("Nome", "VO test");
            vo.insertRow(row);
            getDBTransaction().commit();
            System.out.println("Looks good :-)")
        }
        catch(Exception e) {
            System.out.println("It seems something went wrong :-(");
            e.printStackTrace();
        }

    }

These methods are being called by a managed bean that is connected to two buttons on the page. This managed bean has the following methods. I’ll post just one of them as only the method names change:

public String cb1_action() {

    try{
    FacesContext fctx = FacesContext.getCurrentInstance(); 
    BindingContext bindingContext = BindingContext.getCurrent();
    DCDataControl dc = bindingContext.findDataControl("AppModuleAMDataControl");
    AppModuleAMImpl am = (AppModuleAMImpl)dc.getDataProvider();


    am.criarTesteComEntityObject();
    }
    catch(Exception e) {
        e.printStackTrace();
    }

    return null;
}

I know this is not rocket science or anything but it took a while for me to get there…
Basically, your answers helped me a lot to go and investigate what was happening. The cause? Poor design! ADF is supposed to be organized…
Thank you everyone! 😀