When looking at cross-test logs from Github Actions, I noticed a lot of these errors:
==== >8 ==== Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/thrift/test/TestClientKt has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:756) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:473) at java.net.URLClassLoader.access$100(URLClassLoader.java:74) at java.net.URLClassLoader$1.run(URLClassLoader.java:369) at java.net.URLClassLoader$1.run(URLClassLoader.java:363) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:362) at java.lang.ClassLoader.loadClass(ClassLoader.java:418) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352) at java.lang.ClassLoader.loadClass(ClassLoader.java:351) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:621) ==== 8< ==== I think this is likely related to the change we made to support JDK 8 again, that we probably forgot to change some settings in Kotlin's build process to make it produce JDK 8? Or maybe some missed setting change in Kotlin client/server in cross-test. The lib-java-kotlin unit tests are still passing, and this only happens on crosstest, so I'm not sure how severe this is (maybe it's just a crosstest setup issue that won't have a real impact on the kotlin library).
