Jtreg 4.2 b15 fails certain tests on Windows. This is most likely cause by CODETOOLS-7901369.

Examples of failing JDK tests:

tools/jdeps/modules/GenModuleInfo.java
tools/jdeps/modules/GenOpenModule.java
tools/javap/TestClassNameWarning.java
tools/javac/T6725036.java
tools/javac/lambda/deduplication/DeduplicationTest.java
jdk/modules/scenarios/automaticmodules/RunWithAutomaticModules.java
tools/doclint/tool/PathsTest.java
java/lang/module/ModuleFinderTest.java

The jtr files ends with:
---
result: Passed. Execution successful


test result: Error. failed to clean up files after test
---