primefaces: PickList: NullPointerException after validation failure with Mojarra

Forum Post: https://forum.primefaces.org/viewtopic.php?f=3&t=58237

Stack Overflow: https://stackoverflow.com/questions/54826563/primefaces-picklist-with-omnifaces-validateall-leads-to-nullpointerexception

OmniFaces: https://github.com/omnifaces/omnifaces/issues/488

We null some NULL checks to guard against NPE’s.

The StackTrace is on the mentioned StackOverflow page. With PrimeFaces 7.0 it’s this:

Caused by:java.lang.NullPointerException
    at org.primefaces.component.picklist.PickList.validateValue(PickList.java:140)
    at javax.faces.component.UIInput.validate(UIInput.java:982)
    at org.primefaces.component.picklist.PickList.validate(PickList.java:181)
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1248)
    at javax.faces.component.UIInput.processValidators(UIInput.java:712)
    at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:575)
    at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1689)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIForm.visitTree(UIForm.java:371)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403)
    at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:266)
    at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:63)
    at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219)
    at org.omnifaces.context.OmniPartialViewContext.processPartial(OmniPartialViewContext.java:124)
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1193)
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)

And for the PickListRenderer the NPE is in line 127:

        encodeList(context, pickList, clientId + "_target", PickList.TARGET_CLASS, model.getTarget(),
                pickList.getFacet("targetCaption"), pickList.isShowTargetFilter(), false);