----------System.out:(4/131)----------
wr.get() returned null
java.lang.ref.WeakReference@1ca79ec
The Object is being finalized
queueReader returned, ref==wr is true
----------System.err:(23/1661)----------
Exception in thread "main" java.lang.ExceptionInInitializerError
    at java.util.concurrent.ConcurrentHashMap.fullAddCount(ConcurrentHashMap.java:2581)
    at java.util.concurrent.ConcurrentHashMap.addCount(ConcurrentHashMap.java:2330)
    at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1080)
    at java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:1547)
    at java.lang.ClassLoader.getClassLoadingLock(ClassLoader.java:464)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:405)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:262)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at com.sun.javatest.regtest.agent.MainWrapper.main(MainWrapper.java:78)
Caused by: java.lang.NullPointerException
    at java.util.concurrent.ThreadLocalRandom.getProbe(ThreadLocalRandom.java:982)
    at java.util.concurrent.ConcurrentHashMap.fullAddCount(ConcurrentHashMap.java:2581)
    at java.util.concurrent.ConcurrentHashMap.addCount(ConcurrentHashMap.java:2330)
    at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1080)
    at java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:1547)
    at java.lang.invoke.MethodType$ConcurrentWeakInternSet.add(MethodType.java:1282)
    at java.lang.invoke.MethodType.makeImpl(MethodType.java:314)
    at java.lang.invoke.MethodHandleNatives.findMethodHandleType(MethodHandleNatives.java:287)
    at java.util.concurrent.ThreadLocalRandom.initialSeed(ThreadLocalRandom.java:137)
    at java.util.concurrent.ThreadLocalRandom.<clinit>(ThreadLocalRandom.java:134)

ThreadLocalRandom.java:

    /**
     * Returns the probe value for the current thread without forcing
     * initialization. Note that invoking ThreadLocalRandom.current()
     * can be used to force initialization on zero return.
     */
    static final int getProbe() {
982: return U.getInt(Thread.currentThread(), PROBE);
    }

U is a jdk.internal.misc.Unsaffe and getInt takes an Object and an offset.

In order to get an NPE, Thread.currentThread() must be null.

I tried reproducing it but can't.

This is a compiler test which is why the subcomponent is compiler for now.