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Do you know about ''Full Speed Debugging'' and "HotSwap'' Class File Replacem

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Question: Do you know about "Full Speed Debugging" and "HotSwap" Class File Replacement in Java Debugger since v.1.4.1?

Answer: Part 1. Full Speed Debugging

The Java HotSpot[TM] virtual machine now uses "full-speed debugging". In the previous version of HotSpot, when debugging was enabled, the program executed using only the interpreter. Now, the full performance advantage of HotSpot Technology is available to programs running with debugging enabled. The improved performance allows long running programs to be more easily debugged. It also allows testing to proceed at full speed and the launch of a
debugger to occur on an exception:

-Xrunjdwp:transport=dt_socket,server=y,
onuncaught=y,launch=myDebuggerLaunchScript

Setting a breakpoint only inhibits compilation (full speed execution) for the method containing the breakpoint. Execution reverts to the interpreter during some debug operations such as single-stepping and when method entry/exit or watchpoints are set.

As of version 1.4.1, full-speed debugging is available with both the Java HotSpot Client Vm (default) and Java HotSpot Server VM (invoked with the -server command-line flag). In the Java 2 SDK v1.4.0, full-speed debugging was available only with the Java HotSpot Client VM.
This tip is based on release info for the version 1.4.1 family of the Java 2 SDK.

Part 2 will be found in my next newsletter Smile


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