The PATH environment variable tells the compiler where to find the java , javac , jar , and other executables. This enables you to compile Java classes, run your programs, make .jar files, and so forth, from any directory on your computer.
Navigate to Start > Control Panel > System
Choose the Advanced tab
Click Environment Variables
In the System Variables pane, double click the PATH variable
Scroll to the end of the list of variables, and add the following text (for default installation of SDK 1.4.0): C:\j2sdk1.4.0\bin
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