Use OSGi framework utils to get a classloader (aaaand not depend on the EL implementation in engine)

[marko-bekhta]

I am opening this as a draft just to share.

That's what I ended up with to make that work .... and since we don't have a dependency on OSGi in the engine (and we wouldn't want that one, right ?! 😄) I ended up with some reflection... which is essentially doing this:

	ClassLoader classLoaderForExpressionFactory() {
		for ( Bundle bundle : FrameworkUtil.getBundle( ResourceBundleMessageInterpolator.class ).getBundleContext().getBundles() ) {
			try {
				return bundle.loadClass( "com.sun.el.ExpressionFactoryImpl" ).getClassLoader();
			}
			catch (ClassNotFoundException e) {
				// ignore
			}
		}
		return null;
	}

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[yrodiere]

Looks like a lot of work / complexity for what was only supposed to be a workaround, but... Assuming tests pass here, and your merge this in main only (where we can't run tests on OSGi :x), fine by me.