These "benign" warnings can significantly complicate troubleshooting customer issues.

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/java/jdk1.8.0_321/bin/java -Xcheck:jni -XX:+UnlockCommercialFeatures -XX:+FlightRecorder -version
WARNING in native method: JNI call made without checking exceptions when required to from CallStaticObjectMethod
        at jdk.internal.instrumentation.Tracer.retransformClasses0(Native Method)
        at jdk.internal.instrumentation.Tracer.addInstrumentations(Tracer.java:213)
        - locked <0x000000076dedf090> (a jdk.internal.instrumentation.Tracer)
        at oracle.jrockit.jfr.VMJFR.instrument(VMJFR.java:453)
        at oracle.jrockit.jfr.JFR.init(JFR.java:297)

<...>

WARNING in native method: JNI call made without checking exceptions when required to from CallStaticObjectMethodV
        at java.lang.Object.getClass(Native Method)
        at java.security.AccessControlContext.<init>(AccessControlContext.java:255)
        at java.security.AccessController.createWrapper(AccessController.java:599)
        at java.security.AccessController.doPrivileged(AccessController.java:429)
        at oracle.jrockit.jfr.VMJFR.createJavaLangThreadForBufferthread(VMJFR.java:527)
java version "1.8.0_321"
Java(TM) SE Runtime Environment (build 1.8.0_321-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.321-b07, mixed mode)
$
===