Java must not failed the execution if found an unknown providerId

[josebarrueta]

When a child property couldn't be found, it shouldn't throw an IllegalStateException instead it should ignored, since obviously the SDK version don't support the property. Maybe log it.

        String childClassName = null;
        Object val = data.get(childIdProperty);
        if (val != null) {
            childClassName = String.valueOf(val);
        }
        Class<? extends R> childClass = idClassMap.get(childClassName);

        if (childClass == null) {
            throw new IllegalStateException("No Class mapping could be found for " + childIdProperty + ".");
        }