JDeveloper error when extending VO

Question

I have had problems yesterday and today attempting to create an extending VO with the "mandated" RowImpl class. When I click on the Finish button in the wizard, I get the following error:
Error in updating the java files for component: AbcMyReqsVO
Exception: java.lang.NullPointerException
Exception stack trace:
java.lang.NullPointerException
     at oracle.jbo.dt.objects.JboAttribute.getSuperAttr(JboAttribute.java:1147)
     at oracle.jbo.dt.objects.JboView.doGenerateAttributeGetCode(JboView.java:2375)
     at oracle.jbo.dt.objects.JboView.generateCalculatedAttributeGetBody(JboView.java:2577)
     at oracle.jbo.dt.objects.JboView.generateAttributeMethods(JboView.java:2673)
     at oracle.jbo.dt.objects.JboView.createViewRowFile(JboView.java:1909)
     at oracle.jbo.dt.objects.JboView.saveToJavaFile(JboView.java:1813)
     at oracle.jbo.dt.objects.JboBaseObject.saveObject(JboBaseObject.java:2084)
     at oracle.jbo.dt.objects.JboView.saveObject(JboView.java:1719)
     at oracle.jbo.dt.ui.main.DtuSaveThread.doSaveObject(DtuUtil.java:1538)
     at oracle.jbo.dt.ui.main.DtuSaveThread.run(DtuUtil.java:1528)
If I uncheck the "Generate Accessors" checkbox (as the stack talks about doGenerateAttributeGetCode), the error does not occur.
Can anyone explain this and provide an alternative workaround that allows me to generate by accessor methods?

Answer 1

The problem is in the AllReqsVO.xml. All of the view attributes have the following:
<DesignTime>
<Attr Name="_OverrideAttr" Value="true" />
</DesignTime>
This VO doesn’t extend another VO, therefore the _OverrideAttr shouldn’t be in the ViewAttribute definitions. If you manually edit the AllReqsVO.xml file and remove each of those references, then you will be able to Generate Accessors without getting the nullpointerexception. This will also fix the problem with the other VOs that extend this one, like MyReqsGlanceVO. You don’t have to change the MyReqsGlanceVO.xml, just fix AllReqsVO.xml and then you will be able to Generate Accessors when extending MyReqsGlanceVO.