问题:

I tried http://www.oracle.com/technetwork/middleware/jrockit/downloads/index.html but all I get is

The content on this page is no longer available but your downloads may be found on the Oracle Java Archive page.

回答1:

See Java 7 Questions & Answers (circa 2011):

Q: When will JRockit be available for Java 7?

A: It won't. As we explained last year we are merging JRockit and HotSpot into one single JVM. JDK 7 contains the first release of this converged JVM, where one of the first steps was to start removing the PermGen concept. Future JDK 7 updates will complete the PermGen removal, as well as add more visible features from JRockit.

回答2:

Do also note that the commands in most cases just removed the R from JRockit commands.

JRCMD becomes JCMD

JRMC becomes JMC

JRockit R28: http://docs.oracle.com/cd/E15289_01/doc.40/e15061/toc.htm
HotSpot 8: http://docs.oracle.com/javase/8/docs/technotes/tools/unix/

Flight recording is even better because it - again - can make periodic thread dumps which had been removed in JRockit R28 but was available in JRockit R27.

The only feature I miss is JRockit Deterministic GC. But therefore we have an improved CMS collector and the G1 collector. Time will show whether this is a real alternative.