Does EL support overloaded methods?

Question

I upgraded my Java EE web application to use newer PrimeFaces version and suddenly the call of an overloaded bean method in an action attribute of PrimeFaces commandlink did

Answer 1

EL does not support it, no. It'll always be the first method of the Class#getMethods() array whose name (and amount of arguments) matches the EL method call. Whether it returns the same method everytime or not depends on the JVM make/version used. Perhaps you made a Java SE upgrade in the meanwhile as well. The javadoc even says this:

The elements in the array returned are not sorted and are not in any particular order.

You should not rely on unspecified behaviour. Give them a different name.

Answer 2

The way you can get around this is to create a generic method and do the 'routing' inside that method. I know that this might not be ideal, but you end up with less configurations in functions and XHTML pages.

if (A.class.isInstance(obj)) {
    A o = (A) obj;
    return method(o, highRes);
} else if (B.class.isInstance(obj)) {
    B o = (B) obj;
    return method(o, highRes);
} else if (C.class.isInstance(obj)) {
    C o = (C) obj;
    return method(o, highRes);
} else {
    throw new FacesException("Unsupported Conversion: " + obj);
}