Setting `JAVA_HOME`

Windows

Right click on the 'My Computer' icon, select 'Properties', and click on 'Advanced'.
Click on 'Environment Variables'.
Under 'System variables', click 'New'.
Add a new variable with name JAVA_HOME and the value being the directory containing Java (e.g. C:\Program Files\Java\jdk1.5.0_04).

JAVA_HOME on Windows

Linux

Assuming that dir is the directory containing Java (e.g. /usr/java/jdk1.5):

For bash users, run
```
export JAVA_HOME=dir
```
For tcsh users, run
```
setenv JAVA_HOME dir
```

The instruction can appropriately be placed in ~/.bash_profile or ~/.tcshrc to make sure that it is executed whenever a new shell is started.

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