Like CODETOOLS-7903908, we want to make sure when build configuration is wrong, we print a nice message in jcstress. Currently, JDK 25 builds are failing with:

$ java -jar tests-custom/target/jcstress.jar

...

Exception in thread "main" java.lang.NullPointerException
at java.base/java.io.Reader.<init>(Reader.java:286)
at java.base/java.io.InputStreamReader.<init>(InputStreamReader.java:82)
at org.openjdk.jcstress.infra.runners.TestList.getTests(TestList.java:51)
at org.openjdk.jcstress.infra.runners.TestList.tests(TestList.java:104)
at org.openjdk.jcstress.JCStress.getTests(JCStress.java:222)
at org.openjdk.jcstress.JCStress.getConfigs(JCStress.java:99)
at org.openjdk.jcstress.JCStress.run(JCStress.java:59)
at org.openjdk.jcstress.Main.main(Main.java:57)