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:

1. <build>
2. <defaultGoal>clean compile</defaultGoal>
3. </build>

就会报错误：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project Demo: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] C:\Program Files\Java\jre7\..\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.

1. 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：
   
   解决
   修改Eclipse的配置，使用JDK：Eclipse->Window->Preferences->Java->Installed JREs
   
   Finish后，项目如：
   

OK，知之为知之，不知创造条件必须知！！

 

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：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project Demo: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] C:\Program Files\Java\jre7\..\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.