Which tool is the best one for debug java program?

thanks for your help

Eclipse 2.0 (www.eclipse.org) debugger can take advantage of the Java 1.4 JVM Hot Swap facility allowing you to modify your code while debugging it so you can try something, change it, try it again without having to even restart your program. Great for server-side development.
Not a suprising facility since Eclipse is positioned by IBM as the replacement of Visual Age for Java which will not see further development. And unlike VAJ, it does not depend upon extremely tight coupling between IDE and JVM, it uses a file-based approach rather than the single workspace file mechanism of VAJ, allow it to have greater integration with many, many tools.
Its free, open source and is supported by a consortium including IBM, BEA WebGain, Borland, Red Hat, SuSe, Rational, TogetherSoft and Object Technology. They position it as the Apache of development tools. Some of these guys obviously want to sell you their high end plugins (Rational XDE is one good example) while others seem to be best servered by making sure their own IDE's fully support Eclipse plugins (like Borland and WebGain).
Chuck

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