java.lang.NullPointerException: Cannot invoke "com.sun.javatest.regtest.config.Locations$LibLocn.isTest()" because "this.libLocn" is null
   at com.sun.javatest.regtest.exec.CompileAction.run(CompileAction.java:369)
   at com.sun.javatest.regtest.exec.RegressionScript.run(RegressionScript.java:267)
   at com.sun.javatest.Script.run(Script.java:431)
   at com.sun.javatest.DefaultTestRunner.runTest(DefaultTestRunner.java:183)
   at com.sun.javatest.DefaultTestRunner$1.run(DefaultTestRunner.java:76)


this line needs to check field libLocn for null: https://github.com/openjdk/jtreg/blob/e9bb12e48d7d58839404cc7b077ab7bf8b0cacfb/src/share/classes/com/sun/javatest/regtest/exec/CompileAction.java#L369C69-L369C76