Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:com
not a JRE问题
在使用pom.xml配置默认Goal的时，如果默认的Goal为clean就没问题，但如果是如:
[*]<build>
[*]<defaultGoal>clean compile</defaultGoal>
[*]</build>
就会报错误：
Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project Demo: Compilation failure
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.
[*]经过几番尝试，才发现并不是多个Goal的问题，而是compile Goal的问题。但使用命令的"mvn compile"又是OK的。
几经折腾才发现错误里说的很清楚：Please ensure you are using JDK 1.4 or above and not a JRE"，它需要的是JDK而不是JRE。我给的项目中使用的是公共JRE：
http://www.oseye.net/upload/attached/image/20140321/20140321163228_48354.gif
解决
修改Eclipse的配置，使用JDK：Eclipse->Window->Preferences->Java->Installed JREs
http://www.oseye.net/upload/attached/image/20140321/20140321163546_71815.gif
Finish后，项目如：
http://www.oseye.net/upload/attached/image/20140321/20140321163626_94930.gif
OK，知之为知之，不知创造条件必须知http://www.oseye.net/assets/common/smileys/gza.gif！！
出现问题2：
1、使用spring 注解，如果有两个类的对象一样的名称，程序报错
eg：就会报错误：
Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project Demo: Compilation failure
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.
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