java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02,mixed mode)

和Maven：

Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-14T18:29:23+01:00)
Maven home: /usr/local/Cellar/maven/3.2.5/libexec
Java version: 1.6.0_65,vendor: Apple Inc.
Java home: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
Default locale: en_US,platform encoding: MacRoman
OS name: "mac os x",version: "10.9.5",arch: "x86_64",family: "mac"

当我执行Maven命令时,我得到这个错误：

[ERROR] Failure executing javac,but could not parse the error:
[ERROR] javac: invalid target release: 1.8
[ERROR] Usage: javac <options> <source files>
[ERROR] use -help for a list of possible options
[ERROR] -> [Help 1]

我在这里搜索,有一个接受的解决方案是这样的：

sudo cp $JAVA_HOME/lib/tools.jar /Library/Java/Extensions/

我执行了这个命令,但没有发生任何事情！我不知道怎么了