[2025-08-07T06:04:28,829Z] java.lang.NullPointerException: Cannot invoke "java.nio.file.Path.equals(Object)" because the return value of "java.nio.file.Path.getParent()" is null
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.LinuxHelper.lambda$getDesktopFiles$0(LinuxHelper.java:458)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:196)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:214)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:214)
[2025-08-07T06:04:28,829Z] at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:722)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:635)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:291)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:652)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:658)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.ReferencePipeline.toList(ReferencePipeline.java:663)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.LinuxHelper.getDesktopFiles(LinuxHelper.java:459)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.LinuxHelper.verifyDesktopFiles(LinuxHelper.java:425)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.PackageTest$Handler.verifyPackageInstalled(PackageTest.java:775)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.PackageTest$Handler.processAction(PackageTest.java:720)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.PackageTest$PackageTypePipeline.accept(PackageTest.java:570)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.PackageTest$PackageTypePipeline.accept(PackageTest.java:490)
[2025-08-07T06:04:28,829Z] at java.base/java.util.ImmutableCollections$List12.forEach(ImmutableCollections.java:681)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.PackageTest.lambda$runActions$1(PackageTest.java:464)
[2025-08-07T06:04:28,829Z] at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.PackageTest.lambda$runActions$0(PackageTest.java:463)
[2025-08-07T06:04:28,829Z] at java.base/java.lang.Iterable.forEach(Iterable.java:75)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.PackageTest.runActions(PackageTest.java:462)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.RunnablePackageTest.run(RunnablePackageTest.java:58)
[2025-08-07T06:04:28,829Z] at AppCategoryTest.test(AppCategoryTest.java:70)
[2025-08-07T06:04:28,829Z] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
[2025-08-07T06:04:28,829Z] at java.base/java.lang.reflect.Method.invoke(Method.java:565)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.MethodCall.accept(MethodCall.java:111)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TestInstance.run(TestInstance.java:239)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.lambda$ignoreExceptions$0(TKit.java:202)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.lambda$runTests$1(TKit.java:157)
[2025-08-07T06:04:28,829Z] at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:722)
[2025-08-07T06:04:28,829Z] at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:803)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.lambda$runTests$0(TKit.java:151)
[2025-08-07T06:04:28,829Z] at jdk.jpackage/jdk.jpackage.internal.util.function.ThrowingRunnable.lambda$toRunnable$0(ThrowingRunnable.java:35)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.withExtraLogStream(TKit.java:126)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.withExtraLogStream(TKit.java:117)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.runTests(TKit.java:150)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.runTests(TKit.java:139)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.Main.runTests(Main.java:121)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.Main.lambda$main$5(Main.java:117)
[2025-08-07T06:04:28,829Z] at jdk.jpackage/jdk.jpackage.internal.util.function.ThrowingRunnable.lambda$toRunnable$0(ThrowingRunnable.java:35)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.withExtraLogStream(TKit.java:126)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.TKit.withExtraLogStream(TKit.java:117)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.Main.main(Main.java:117)
[2025-08-07T06:04:28,829Z] at jdk.jpackage.test.Main.main(Main.java:45)
[2025-08-07T06:04:28,829Z] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
[2025-08-07T06:04:28,829Z] at java.base/java.lang.reflect.Method.invoke(Method.java:565)
[2025-08-07T06:04:28,829Z] at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
[2025-08-07T06:04:28,829Z] at java.base/java.lang.Thread.run(Thread.java:1474)

Code:

    private static Collection<Path> getDesktopFiles(JPackageCommand cmd) {
        var unpackedDir = cmd.appLayout().desktopIntegrationDirectory();
        var packageDir = cmd.pathToPackageFile(unpackedDir);
        return getPackageFiles(cmd).filter(path -> {
            return path.getParent().equals(packageDir) && path.getFileName().toString().endsWith(".desktop");
        }).map(Path::getFileName).map(unpackedDir::resolve).toList();
    }

Appears to assume the path must have a parent.