Mac OS上的javac 8不编译，说是1.7

Question

我已经在Mac OS X上安装了JDK 1.8.0_25。当尝试编译Java8源代码时，它会抱怨：

  > javac -source 1.8 ComposableList.java
  javac: invalid source release: 1.8

  > which javac
  /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/javac
  > java -version
  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)

  > javac -version
  javac 1.7.0_60

> which java
/usr/bin/java
> which javac
/usr/bin/javac

> /Library/Java/JavaVirtualMachines/jdk1.7.0_21.jdk/Contents/Home/bin/javac -version
javac 1.7.0_60
> /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home/bin/javac -version
javac 1.7.0_60
> /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/javac -version
javac 1.7.0_60

编辑3：正如@dan所建议的，是否所有javac都是指向单个javac的符号链接？不，原来没有符号链接：

>ls -l /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/javac
-rwxrwxr-x  1 root  wheel  99376 Sep 17 17:13         /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/javac
> ls -l /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home/bin/javac
-rwxrwxr-x  1 root  wheel  99360 Mar 18  2014 /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home/bin/javac

Answer 1

答案如下:https://stackoverflow.com/a/22547808/130228。结果是，javac如果找到~/library/java/extensions/tools.jar就执行它。所以删除~/library/java/extensions就可以了。

感谢https://stackoverflow.com/users/3439760/user3439760为我找到答案，感谢Franco Azabache为我找到链接。