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https://issues.apache.org/jira/browse/ISIS-3101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Daniel Keir Haywood resolved ISIS-3101.
---------------------------------------
    Resolution: Fixed

just made the second param optoinal, with javadoc to explain why.

> [Regression] NPE on bookmark rehydration
> ----------------------------------------
>
>                 Key: ISIS-3101
>                 URL: https://issues.apache.org/jira/browse/ISIS-3101
>             Project: Isis
>          Issue Type: Bug
>          Components: Isis Core
>            Reporter: Andi Huber
>            Assignee: Daniel Keir Haywood
>            Priority: Blocker
>             Fix For: 2.0.0-M8
>
>
> {noformat}
> Caused by: java.lang.NullPointerException: targetEntityClass is marked 
> non-null but is null
>       at 
> org.apache.isis.applib.services.bookmark.idstringifiers.IdStringifierForSerializable.destring(IdStringifierForSerializable.java:80)
>  ~[classes/:?]
>       at 
> org.apache.isis.applib.services.bookmark.idstringifiers.IdStringifierForSerializable.destring(IdStringifierForSerializable.java:1)
>  ~[classes/:?]
>       at 
> org.apache.isis.core.runtimeservices.bookmarks.BookmarkServiceDefault.read(BookmarkServiceDefault.java:147)
>  ~[classes/:?]
>       at 
> org.apache.isis.commons.internal.memento._Mementos_MementoDefault.get(_Mementos_MementoDefault.java:89)
>  ~[classes/:?]
>       at 
> org.apache.isis.core.metamodel.facets.object.viewmodel.ViewModelFacetForDomainObjectAnnotation.lambda$6(ViewModelFacetForDomainObjectAnnotation.java:115)
>  ~[classes/:?]
> {noformat}



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