DeltaSpikeExceptionHandler getRootCause assumes caught FacesException is wrapping another Exception

It may be incorrect by the underlying JSF implementation to not wrap another exception with FacesException. However errors such as detection of duplicate id's are in nature FacesExceptions and the opposite could be argued.

Regardless it's best if DeltaspikeExceptionHandler null checks rather then assuming every FacesException wraps another Exception to ensure robustness.

This is the code Thomas Andraschko proposed as a fix. I have verified it locally and it fixed my problem.

In DeltaspikeExceptionHandler, override getRootCause:
@Override
public Throwable getRootCause(Throwable throwable)
{
while ((ELException.class.isInstance(throwable) || FacesException.class.isInstance(throwable))
&& throwable.getCause() != null)

{ throwable = throwable.getCause(); }

return throwable;
}

Before local fix:
java.lang.IllegalArgumentException: exception must not be null
org.apache.deltaspike.core.api.exception.control.event.ExceptionStackEvent.<init>(ExceptionStackEvent.java:60)
org.apache.deltaspike.core.impl.exception.control.ExceptionHandlerBroadcaster.executeHandlers(ExceptionHandlerBroadcaster.java:75)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcces

After:
javax.faces.FacesException: Component with id:info not found
org.apache.myfaces.renderkit.html.HtmlAjaxBehaviorRenderer.getComponentId(HtmlAjaxBehaviorRenderer.java:461)
org.apache.myfaces.renderkit.html.HtmlAjaxBehaviorRenderer.build(HtmlAjaxBehaviorRenderer.java:433)
org.apache.myfaces.renderkit.html.HtmlAjaxBehaviorRenderer.mapToString(HtmlAjaxBehaviorRenderer.java:405)
org.apache.myfaces.renderkit.html.HtmlAjaxBehaviorRenderer.makeAjax(HtmlAjaxBehaviorRenderer.java:158)
org.apache.myfaces.renderkit.html.HtmlAjaxBehaviorRenderer.getScript(HtmlAjaxBehaviorRenderer.java:102)