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I am really having trouble starting with eclipse. I want to configure eclipse so that it uses the version 7 for both the jdk and jre. How can I do this.

Right now,when I try to deploy my application to google app engine, I get this message :

java.lang.RuntimeException: Cannot get the System Java Compiler. Please use
a JDK, not a JRE.

This is my configuration for the installed jre section :

enter image description here

What could be the reason for the problem ? Please give an insight into the problem.

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6
  • Run Configurations... -> JRE tab Commented Mar 13, 2014 at 16:14
  • Can you give us the complete path of the JDK Location? Commented Mar 13, 2014 at 16:18
  • A JDK contains the JRE... Commented Mar 13, 2014 at 16:27
  • @PabloLozano home/non-admin/jdk1.7.0_02/ Commented Mar 13, 2014 at 16:29
  • Have you checked stackoverflow.com/questions/13938995/… Commented Mar 14, 2014 at 8:35

1 Answer 1

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The reason is just what the error message says: The Google App Engine apparently will not run your code with a JDK, but only a JRE.

Your eclipse JRE/JDK settings do not matter here. They can't cause your deployment target to suddenly have a JDK installed. But since you use JDK features (like the compiler), your app will not run where only a JRE is installed.

For a remedy, you can bundle the eclipse compiler ecj.jar (you'll find it somewhere in the internet or even via maven) with your application, and rewrite the part that compiles stuff accordingly.

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11 Comments

It quite the opposite: a JDK is needed.
@PabloLozano How is thta the opposite?
You have written that GAE does not run in a JDK, but the error message says "Please use a JDK"
@PabloLozano You must be confused. The message appears precisely because he needs an JDK, but GAE has none. That is what I said!
Ok, I got it: what you really mean is "The GAE apparently is not running on a JDK, but only on a JRE". If you use present simple the meaning changes a lot. PS: the downvote is not mine :(
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