Missing java.lang.ref.Reference.waitForReferenceProcessing() for openjdk regression tests for TLS 1.3

[pshipton]

< sun/security/provider/FileInputStreamPool/FileInputStreamPoolTest.java Failed. Execution failed: `main' threw exception: java.lang.Error: java.lang.NoSuchMethodException: java.lang.ref.Reference.waitForReferenceProcessing()

It appears a private method java.lang.ref.Reference.waitForReferenceProcessing() is required.

[JasonFengJ9]

https://github.com/ibmruntimes/openj9-openjdk-jdk11/blob/b44d19c4cbca42541aef5132f21870c1b924a68c/test/jdk/sun/security/provider/FileInputStreamPool/FileInputStreamPoolTest.java#L152-L154

                waitForReferenceProcessingMethod =
                    Reference.class.getDeclaredMethod("waitForReferenceProcessing");
                waitForReferenceProcessingMethod.setAccessible(true);

@LinHu2016 is on this.

[LinHu2016]

I can add new private static method waitForReferenceProcessing() in Reference.java to avoid the issue, but apparently test code (FileInputStreamPoolTest.java) uses unusual reflection way to access private method.

[LinHu2016]

currently plan to add private static method waitForReferenceProcessing() for Java 9 or above, but we can also add it in Java 8 openJ9

[JasonFengJ9]

It appears this test is against RI specific internal behaviour (a private static method). If there is no usage I would suggest to add it for JDK11 and onwards.