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When starting jenkins slave, used JAVA_HOME is always the java used to start the jenkins slave. In my case, it was C:\Program Files\Java\jre7.
As it's only a JRE, and not a full JDK, it didn't contain the javac executable.
As a consequence, I got
[ERROR] Unable to locate the Javac Compiler in:
C:\Program Files\Java\jre7\..\lib\tools.jar
Please ensure you are using JDK 1.4 or above and
not a JRE (the com.sun.tools.javac.Main class is required).
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable.
in my maven build log.
Which allowed me to track it to the jenkins-slave.xml file.
As far as i understand, this file is used to configure how the jenkins slave is started, when run using Windows service.
So, in that file, there is this entry :
<!--
if you'd like to run Jenkins with a specific version of Java, specify a full path to java.exe.
The following value assumes that you have java in your PATH.
-->
<executable>C:\Program Files\Java\jre7\bin\java.exe</executable>
I had to change it to one full JDK to have Jenkins able to compile.
Unfortunatly, i'm quite sure Jenkins will only compile using the JDK I choose (<executable>C:\Program Files\Java\jdk1.6.0_24\bin\java.exe</executable>).
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Major