Maven Unable to locate the Javac Compiler

问题

 BUILD FAILURE

[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.882s
[INFO] Finished at: Tue Nov 20 14:06:07 CST 2012
[INFO] Final Memory: 4M/9M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project Alpha_MVN: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] C:\Program Files (x86)\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.

解决：

• Go to Window -> Preferences -> Java -> installed JREs
• Select the JRE you are using (Should be the one inside jdk. Ex: C:\Program Files\Java\jdk1.6.0_25\jre)
• Press Edit -> Add External JARs...
• Browse to Java\jdk1.6.0_25\lib and select tools.jar and Press Enter
• Press Finish and OK