Error running BlackBerry app from Eclipse

I am developing an app with 65 class files. I recently r开发者_如何学编程e-installed Eclipse and now I can't run the app:

I/O Error: Cannot run program "jar": CreateProcess error=2 The system cannot find the file specified

I checked my Java_Path and I don't see any problems.

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You are probably running only a JRE you need a JDK . echo out your JAVA_HOME variable and tell us what it says.