JDeveloper: bindingContext.findDataControl deprecated

You get a warning, that says:

Warning: findDataControl(java.lang.String) in oracle.adf.model.BindingContext has been deprecated.

So you need another, up-to-date way to get your data control.
Try this:

private static ApplicationModuleImpl getAppModuleImpl(final String dataControlName) {
    final FacesContext fc = FacesContext.getCurrentInstance();
    final ELContext elContext = fc.getELContext();
    final ExpressionFactory elFactory = fc.getApplication().getExpressionFactory();
    final ValueExpression valueExp = elFactory.createValueExpression(elContext, "#{data." + dataControlName + ".dataProvider}", ApplicationModuleImpl.class);
    return (ApplicationModuleImpl) valueExp.getValue(elContext);
}

Usually, the data control name is like {Application Module name} + "DataControl".
Hard to find? Look into DataBindings.cpx and look for BC4JDataControl elements id attribute.

What's that data literal there? That's oracle.adf.model.BindingContext.CONTEXT_ID hardcoded.