Dan Haywood created ISIS-1873:
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             Summary: Resilience: if hideXxx, disableXxx or validateXxx method 
throws NPE, then assume veto and log a WARNing.
                 Key: ISIS-1873
                 URL: https://issues.apache.org/jira/browse/ISIS-1873
             Project: Isis
          Issue Type: Improvement
    Affects Versions: 1.16.1
            Reporter: Dan Haywood
             Fix For: 2.0.0-M1


Currently the framework doesn't degrade gracefully.

For example, had a coding error in a hideXxx() method.

This resulted in the error page, rather than simply hide the relevant member.
{code:java}
org.eclipse.jetty.util.thread.QueuedThreadPool#runJob(QueuedThreadPool.java:672)
org.eclipse.jetty.util.thread.QueuedThreadPool$2#run(QueuedThreadPool.java:590)
java.lang.Thread#run(Thread.java:745)
Caused by:
java.lang.NullPointerException
org.isisaddons.module.command.dom.CommandJdo#hideReplayStateFailureReason(CommandJdo.java:386)
sun.reflect.NativeMethodAccessorImpl#invoke0(NativeMethodAccessorImpl.java:-2)
sun.reflect.NativeMethodAccessorImpl#invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl#invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method#invoke(Method.java:498)
org.apache.isis.core.commons.lang.MethodExtensions#invoke(MethodExtensions.java:53)
org.apache.isis.core.metamodel.adapter.ObjectAdapter$InvokeUtils#invoke(ObjectAdapter.java:38{code}



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