[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project ERP: Compilation failure [ERROR] Unable to locate the Javac Compiler in: [ERROR] C:Program FilesJavajre7..libtools.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] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
解决方案
步骤一：Window -> Preferences -> Java -> installed JREs ->点击"Add"按钮，选择默认的"Standard VM", 点击"Next >", 点击"JRE home"右边的"Directory"选择目录 C:Program FilesJavajdk1.7.0_60jre，“确定”回 到"Installed JREs"界面，勾选刚添加的"jdk1.7.0_60"。
步骤二：Window -> Preferences -> Java -> installed JREs -> 点选界面左侧的"JaveSE-1.7"，然后在右侧勾选"jdk1.7.0_60"。
步骤三：在<eclipse安装目录>/eclipse.ini文件中添加以下两行：(一定要加在-startup之前，注意以下是两行)：
-vm
C:Program FilesJavajdk1.7.0_60jreinjavaw.exe
步骤四：重启Eclipse,一切OK了。
问题分析
系统装了两个JRE，应该用JDK中的那个JRE
java
|—jdk1.7.0_60
|—jre
|—jre7
系统默认使用java/jre7,但是该目录下没有tools.jar。所以需要使用java/jdk1.7.0_60/jre，该目录下存在tools.jar包