RFR: 8283715: Update ObjectStreamClass to be final

[Jaikiran Pai]

On Tue, 29 Mar 2022 01:07:33 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> Pretty much just what it says.

The test failures caught by GitHub Actions jobs look related to the area of this change:


2022-03-29T02:21:21.2187570Z 	at CheckCSMs.main(CheckCSMs.java:98)
2022-03-29T02:21:21.2188140Z 	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
2022-03-29T02:21:21.2188650Z 	at java.base/java.lang.reflect.Method.invoke(Method.java:577)
2022-03-29T02:21:21.2189060Z 	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
2022-03-29T02:21:21.2189420Z 	at java.base/java.lang.Thread.run(Thread.java:828)
2022-03-29T02:21:21.2189590Z 
2022-03-29T02:21:21.2190030Z JavaTest Message: Test threw exception: java.lang.RuntimeException: Unexpected non-final instance method: 
2022-03-29T02:21:21.2190400Z java/io/ObjectStreamField#getType ()Ljava/lang/Class;

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PR: https://git.openjdk.java.net/jdk/pull/8009