[jboss-jira] [JBoss JIRA] (ELY-1745) The AvailableRealmsCallback should not result in a NPE if there is no mechanism configuration.

[Darran Lofthouse (Jira)]

Darran Lofthouse created ELY-1745:
-------------------------------------

             Summary: The AvailableRealmsCallback should not result in a NPE if there is no mechanism configuration.
                 Key: ELY-1745
                 URL: https://issues.jboss.org/browse/ELY-1745
             Project: WildFly Elytron
          Issue Type: Bug
          Components: API / SPI
            Reporter: Darran Lofthouse
             Fix For: 1.8.0.CR2


The NPE is due to the following code: -

{noformat}
                } else if (callback instanceof AvailableRealmsCallback) {
                    Collection<String> names = stateRef.get().getMechanismConfiguration().getMechanismRealmNames();
                    if (log.isTraceEnabled()) {
                        log.tracef("Handling AvailableRealmsCallback: realms = [%s]", String.join(", ", names));
                    }
                    if (! names.isEmpty()) {
                        ((AvailableRealmsCallback) callback).setRealmNames(names.toArray(new String[names.size()]));
                    }
                    handleOne(callbacks, idx + 1);
{noformat}

If mechanism configuration is mandatory this should report an appropriate error, if not it should fallback to specifying an empty list.



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