The environment variable JAVA_HOME tells the compiler where to find the home directory of your Java installation.
Example on Windows XP:
Navigate to Start > Control Panel > System
Choose the Advanced tab
Click Environment Variables
In the System Variables pane, click New
For Variable Name , type JAVA_HOME
For Variable Value type, C:\j2sdk1.4.0 for a default installation of SDK 1.4. You may need to adjust your value based on your installation.
Follow the same instructions for related environment variables such as TOMCAT_HOME .
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