Getting operation bindings in constructor of managed bean

Question

Hi,
Jdeveloper version - 11.1.1.5.0
I have a request scoped managed bean
public class getOperationBindingBean {
    private RichCommandButton button;
    public getOperationBindingBean() {
        BindingContainer bindings = getBindings();
        OperationBinding operationBinding = bindings.getOperationBinding("getViewProperty");
        Object result = operationBinding.execute();//17th line
    public BindingContainer getBindings() {
        return BindingContext.getCurrent().getCurrentBindingsEntry();
    public void setButton(RichCommandButton button) {
        this.button = button;
    public RichCommandButton getButton() {
        return button;
    public void onButtonClick(ActionEvent actionEvent) {
}and a page getOperationBinding.jspx.
<f:view>
    <af:document id="d1">
      <af:messages id="m1"/>
      <af:form id="f1">
        <af:commandButton text="Button" id="cb1"
                          binding="#{getOperationBindingBean.button}"
                          actionListener="#{getOperationBindingBean.onButtonClick}"/>
      </af:form>
    </af:document>
</f:view>getViewProperty is a methodAction defined for getOperationBinding.jspx.
When I run application the page is loaded succesfully, but when you press the button on the page I get an error:
oracle.adf.controller.ControllerException: ADFC-10001: cannot instantiate class "getOperationBindingBean"
     at oracle.adfinternal.controller.util.Utils.createAndLogFacesException(Utils.java:184)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
Caused by: java.lang.NullPointerException
     at oracle.adfinternal.view.faces.model.binding.FacesCtrlActionBinding._execute(FacesCtrlActionBinding.java:252)
     at oracle.adfinternal.view.faces.model.binding.FacesCtrlActionBinding.execute(FacesCtrlActionBinding.java:210)
     at getOperationBindingBean.(getOperationBindingBean.java:17)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
     at java.lang.Class.newInstance0(Class.java:355)
     at java.lang.Class.newInstance(Class.java:308)
     at oracle.adfinternal.controller.beans.ManagedBeanFactory.newInstance(ManagedBeanFactory.java:187)
     ... 52 moreIf you remove the binding property from commandButton, the pressing on the button doesn't cause any error.
I need call getTableProperty() method in constructor, because this method returns from database the properties of table that I want to build in the page, and I also need have a binding property for command button.
So the question is can I get operation bindings in constructor of managed bean in this situation?
Evgeny

Answer 1

Calling the method in the constructor is not a good idea.
check https://blogs.oracle.com/adf/entry/an_epic_question_how_to