Change By: Martin Kouba (20/Aug/13 9:37 AM)
Description: The spec is not clear in this area and the Weld ServiceLoader implementation supports package-private extension classes. However we should follow the JDK's ServiceLoader implementation which does not allow package-private service provider classes.

See TCK tests:
org.jboss.jsr299.tck.tests.extensions.observer.broken.definitionError.ProcessObserverMethodErrorTest .testAddDefinitionError
org.jboss.jsr299.tck.tests.extensions.observer.broken.exception.ProcessObserverMethodExceptionTest .testExceptionIsDefinitionError
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