Unable to locate the Javac Compiler with Maven and Eclipse

Unable to locate the Javac Compiler in:
C:\Program Files\Java\jre6\..\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.

The solution that worked for me (tested on both 32- and 64-bit Eclipse/Java) was not to change theeclipse.ini, but to instead set the Runtime JRE on the JRE tab of the Run/Debug Configuration dialog to use the appropriate JDK, either as the “Workspace default JRE” or the “Alternate JRE”

http://blog.dpdearing.com/2011/06/unable-to-locate-the-javac-compiler-with-maven-and-eclipse/