[8u] RFR 8280060: The sun/rmi/server/Activation.java class use Thread.dumpStack()

[Sergey Bylokhov]

Hello,

Please review the fix for JDK-8280060.

JBS: https://bugs.openjdk.java.net/browse/JDK-8280060
Webrev: http://cr.openjdk.java.net/~serb/8280060/webrev.00

This change removes the "Thread.dumpStack()" from the Activation class which seems was used for 
debugging. In jdk8 It was added by the JDK-8174770 here:
http://hg.openjdk.java.net/jdk8u/monojdk8u/annotate/98c3f2812caf/jdk/src/share/classes/sun/rmi/server/Activation.java#l538

The same patch for jdk11 does not have it:
https://github.com/openjdk/jdk11u/commit/4ce7b5f28063abca8391d5d7173a45210191e269#diff-fe5b09c998a43189c85b9465455d866b07b32131b2b0f85a6e5801176b22362aR548


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Best regards, Sergey.