setting the JAVA_HOME environment variable

[James Gray]

On 24/03/2008, at 7:35 PM, Thufir wrote:
---8<---  SNIPPED ---8<---
> extconf.rb:33: JAVA_HOME is not directory. (RuntimeError)
> thufir at arrakis:~$
> thufir at arrakis:~$ echo $JAVA_HOME
> /usr/lib/jvm/java-6-sun/jre/bin/java

The error message is correct - JAVA_HOME is a directory, not the Java  
binary.  In your case it appears you need to replace your existing  
JAVA_HOME with:
$ export JAVA_HOME=/usr/lib/jvm/java-6-sun/jre

In short the JAVA_HOME variable should be the *directory* that  
contains the "bin" directory that holds your preferred java binary.   
IOW "/usr/lib/jvm/java-6-sun/jre" (ie, JAVA_HOME) holds "bin/" which  
holds your preferred "java" binary, so when you string it together you  
end up with (mathematically):
/usr/lib/jvm/java-6-sun/jre + bin/ + java = /usr/lib/jvm/java-6-sun/ 
jre/bin/java

Voila :)

HTH,

James
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