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https://issues.apache.org/jira/browse/MYFACES-4504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Paul Nicolucci resolved MYFACES-4504.
-------------------------------------
Resolution: Fixed
> UnsupportedOperationException from NavigationHandlerImpl.handleNavigation
> -------------------------------------------------------------------------
>
> Key: MYFACES-4504
> URL: https://issues.apache.org/jira/browse/MYFACES-4504
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 2.3-next-M7, 4.0.0-RC2
> Reporter: Paul Nicolucci
> Assignee: Paul Nicolucci
> Priority: Major
> Fix For: 2.3-next-M8, 4.0.0-RC3
>
>
> Stack trace of the exception:
>
> {noformat}
> java.lang.UnsupportedOperationException
> at java.base/java.util.AbstractMap.put(AbstractMap.java:209)
> at
> org.apache.myfaces.application.NavigationHandlerImpl.handleNavigation(NavigationHandlerImpl.java:194)
> at
> org.apache.myfaces.application.NavigationHandlerImpl.handleNavigation(NavigationHandlerImpl.java:115)
> at
> org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:122)
> at jakarta.faces.component.UICommand.broadcast(UICommand.java:65)
> at jakarta.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:1233)
> at jakarta.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:414)
> at jakarta.faces.component.UIViewRoot._process(UIViewRoot.java:1705)
> at
> jakarta.faces.component.UIViewRoot.processApplication(UIViewRoot.java:915)
> at
> org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:43)
> at
> org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:172)
> at
> org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:125)
> at
> jakarta.faces.webapp.FacesServlet.service(FacesServlet.java:223){noformat}
> This happens because there is an [EmptyMap returned
> from|https://github.com/apache/myfaces/blob/main/impl/src/main/java/org/apache/myfaces/application/NavigationHandlerImpl.java#L174]:
> {noformat}
> Map<String, List<String>> navigationCaseParameters =
> navigationCase.getParameters();{noformat}
> and then a "put" operation is executed. However, the EmptyMap is coming from
> the changes in this commit (RedirectImpl.getViewParams()):
> [https://github.com/apache/myfaces/commit/7262f0a3296bd2c31402dc571d65a1816a4e45a9#diff-5251ef056d9a5508580a730031342370484f088738963e6e676fc3c151006ca0R49]
> The "Collections.emptyMap()" is immutable and therefore the
> UnsupportedOperationException is thrown.
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