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

[Justin Cook (Jira)]

    [ https://issues.jboss.org/browse/ELY-1745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13777375#comment-13777375 ] 

Justin Cook commented on ELY-1745:
----------------------------------

Since my internship is finishing today, I am unassigning myself from this issue. Work done so far is available on my clone of the [WildFly Elytron repository|https://github.com/justinmcook/wildfly-elytron/tree/ELY-1745]

> 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
>            Assignee: Justin Cook
>            Priority: Major
>             Fix For: 1.10.0.CR7
>
>
> 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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