[MYFACES-4504] UnsupportedOperationException from NavigationHandlerImpl.handleNavigation

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3-next-M7, 4.0.0-RC2
• Fix Version/s: 2.3-next-M8, 4.0.0-RC3
• Component/s: General
• Assignee: Paul Nicolucci
• Reporter: Paul Nicolucci
• Created: 18/Nov/22 19:05
• Updated: 16/Dec/22 21:38
• Resolved: 22/Nov/22 13:08

Description

Stack trace of the exception:

 

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)

This happens because there is an EmptyMap returned from:

Map<String, List<String>> navigationCaseParameters = navigationCase.getParameters();

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.

Issue Links

• links to: GitHub Pull Request #387
• links to: GitHub Pull Request #388