[jboss-dev-forums] [JBoss AS7 Development] - Re: Help, my extension isn't starting

[Carlo de Wolf]

Carlo de Wolf [http://community.jboss.org/people/wolfc] created the discussion

"Re: Help, my extension isn't starting"

To view the discussion, visit: http://community.jboss.org/message/584599#584599

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+Why is this such a hassle?+

For that we need to take a look in the JDK source ServiceLoader.java:
    public S next() {
        if (!hasNext()) {
        throw new NoSuchElementException();
        }
        String cn = nextName;
        nextName = null;
        try {
        S p = service.cast(Class.forName(cn, true, loader)
                   .newInstance());
        providers.put(cn, p);
        return p;
        } catch (ClassNotFoundException x) {
        fail(service,
             "Provider " + cn + " not found");
        } catch (Throwable x) {
        fail(service,
             "Provider " + cn + " could not be instantiated: " + x,
             x);
        }
        throw new Error();        // This cannot happen
    }


If it encounters a ClassNotFoundException it doesn't emmit which class it can not find. Also the original exception is swallowed, so any diagnostic information within is lost.

They got one thing right though: fail. ;-)
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