[ERROR] Unable to locate the Javac Compiler in

Unable to locate the Javac Compiler in:
[ERROR] C:\Program Files\Java\jre6\..\lib\tools.jar
[ERROR] Please ensure you are using JDK 1.4 or above and
[ERROR] not a JRE (the com.sun.tools.javac.Main class is required).
[ERROR] In most cases you can change the location of your Java
[ERROR] installation by setting the JAVA_HOME environment variable.
[ERROR] -> [Help 1]

I got this error while running maven.
Please help me to solve it.

Follow The URL,

http://www.concretepage.com/build-tools/maven/maven_unable_to_locate_javac_compiler_tools.php