VisualVM is a new tool Sun is providing for doing runtime analysis of Java applications (both local and remote ones).
It mades available through a simple GUI all sort of graphical data about threads, heap, GC, classes and much more (being it expansible through plugins).
It deeply integrates with a number of CLI ("Command Line Interface") tools the JDK already comes with.
Right now I can't tell you more than this, but I'm looking forward to writing a review if this tool proves itself really useful.
I wonder how it will perform when profiling Tomcat running my webapps...
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