Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I've set JAVA_HOME in my Windows environment preferences:

echo %JAVA_HOME%  
C:\Program Files (x86)\Java\jdk1.6.0_20

However whenever I try to run ant build I get the following:

Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "C:\Program Files\Java\jre6"

I think the registry key JAVASOFT is interfering with my environment variable, but I'm not sure. Any ideas how to fix this?

share|improve this question

JAVA_HOME should be set to C:\Program Files\Java in the Command Prompt. You can do this with the following:

set JAVA_HOME=C:\Program Files\Java

This will then look for the most current jdk, lib, jre installed on your system.

share|improve this answer
up vote 1 down vote accepted

I needed to copy the Tools.jar file from the jdk/lib folder to the jre/lib folder.

share|improve this answer
> I needed to copy the Tools.jar file from the jdk/lib folder to the > jre/lib folder. Nice , it works !!! but just I want to know why ? why this does it work ? – user100995 Oct 11 '11 at 9:49

OK, guys, for Windows 7 it needs the JAVA_HOME as a Windows Environmental Variable, I've also added C:\Program Files\Java\jdk1.7.0_03\ and C:\Program Files\Java\jdk1.7.0_03\bin to PATH, restarted Eclipse, now it works

Also - when javac refers to java classes from the JDK, it needs the main SDK folder, not the bin, the bin is only for the javac.exe, while the main folder has \include\ and other stuff necessary for compilation.

share|improve this answer

Does seting your PATH variable to include your JAVA_HOME help?

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .