Error when trying to add lambda arrow into Collectors.mapping method

[incognitoTheta]

Apache NetBeans version

Apache NetBeans 15

What happened

Stream.of(
                new Student("Fred", 87, "Math", "Physics"),
        ).collect(Collectors.groupingBy(s-> letterGrade(s), Collectors.mapping(s->)))

For this particular code, everytime I add the lambda arrow into Collectors.mapping method I receive this Netbeans error:

UnexpectedException details:

Annotation: An error occurred during parsing of 'C:\Users\Radu\Documents\NetBeansProjects\Stream\src\main\java\stream\pearson\DownstreamCollecting2.java'. Please report a bug against java/source and attach dump file 'C:\Users\Radu\AppData\Roaming\NetBeans\15\var\log\DownstreamCollecting2_59.dump'.
An error occurred during parsing of 'C:\Users\Radu\Documents\NetBeansProjects\Stream\src\main\java\stream\pearson\DownstreamCollecting2.java'. Please report a bug against java/source and attach dump file 'C:\Users\Radu\AppData\Roaming\NetBeans\15\var\log\DownstreamCollecting2_59.dump'.
Caused by: java.lang.IllegalStateException: java.lang.ClassCastException
	at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:383)
	at org.netbeans.modules.java.source.parsing.JavacParser.moveToPhase(JavacParser.java:770)
	at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:540)
	at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:141)
	at org.netbeans.modules.parsing.impl.TaskProcessor.callGetResult(TaskProcessor.java:608)
	at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:241)
	at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:775)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:279)
	at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:702)
	at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:663)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
Caused by: java.lang.ClassCastException
An error occurred during parsing of 'C:\Users\Radu\Documents\NetBeansProjects\Stream\src\main\java\stream\pearson\DownstreamCollecting2.java'. Please report a bug against java/source and attach dump file 'C:\Users\Radu\AppData\Roaming\NetBeans\15\var\log\DownstreamCollecting2_59.dump'.

How to reproduce

Stream.of(
                new Student("Fred", 87, "Math", "Physics"),
        ).collect(Collectors.groupingBy(s-> letterGrade(s), Collectors.mapping(s->)))

To reproduce the error just add ">" after "-" in mapping argument

Did this work correctly in an earlier version?

No / Don't know

Operating System

Windows 11

JDK

open jdk 11

Apache NetBeans packaging

Apache NetBeans provided installer

Anything else

This problem occures everytime.

Are you willing to submit a pull request?

No

Code of Conduct

Yes

[neilcsmith-net]

Please report a bug against java/source and attach dump file 'C:\Users\Radu\AppData\Roaming\NetBeans\15\var\log\DownstreamCollecting2_59.dump'.

Please attach that file to the bug report, thanks.

It's not reproducible here. Is this a clean install, or have you imported settings from a previous version? What build system? Can you attach a simple project that fails for you with this error to the report as well?

[incognitoTheta]

DownstreamCollecting2_59.zip

I imported the settings from previous versions (14,13,12,11...if I remember right)

test-local-app.zip

I attached the requested files. I don't know what you mean by build system. Can you detail please?

Thanks