java.lang.ClassCastException has occurred during launch

[larry-zpt]

Apache NetBeans version

Apache NetBeans 26

What happened

The program in IDE debug will not launch. using JDK-24

messages.log\

java.lang.ClassCastException: class org.netbeans.spi.debugger.ActionsProvider$ContextAware cannot be cast to class org.openide.util.Cancellable (org.netbeans.spi.debugger.ActionsProvider$ContextAware is in unnamed module of loader org.netbeans.StandardModule$OneModuleClassLoader @2169c0f; org.openide.util.Cancellable is in unnamed module of loader 'app')
	at org.netbeans.api.debugger.ActionsManager$AsynchActionTask.getCancellable(ActionsManager.java:694)
	at org.netbeans.api.debugger.ActionsManager$AsynchActionTask.cancel(ActionsManager.java:672)
	at org.netbeans.api.debugger.DebuggerManager.startDebugging(DebuggerManager.java:383)
	at org.netbeans.api.debugger.jpda.JPDADebugger.startListeningAndGetEngines(JPDADebugger.java:245)
	at org.netbeans.modules.debugger.jpda.ant.JPDAStart$1.run(JPDAStart.java:535)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1403)
	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:287)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2018)

Language / Project Type / NetBeans Component

No response

How to reproduce

Just starting the app in debug mode

Did this work correctly in an earlier version?

Apache NetBeans 23

Operating System

Windows 11 for Workstations

JDK

JDK-24

Apache NetBeans packaging

Apache NetBeans platform

Anything else

No response

Are you willing to submit a pull request?

No

[matthiasblaesing]

You need to declare (repeatable) steps to reproduce, if you want help. Starting at zero (clean installation of NB26, no preferences modified), what steps are necessary (including all necessary artifacts) to reproduce the problem.

Your "steps to reproduce" literally says nothing relevant: "Just starting the app in debug mode".

• what app?
• what build system?
• started how?
• what is the code?