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When editing Java code in Eclipse I can modify the code while it’s running in various ways and have those changes take effect without restarting my program.
What is the technology underlying this feature? Is it part of Eclipse, or is it something I can do with the command line tools and the tools that come with the JDK?
Its part of the JVM and its called HotSwap.
http://download.oracle.com/javase/1.4.2/docs/guide/jpda/enhancements.html