运行为1.5的OSX 10.9.2上的Java 1.7？

Question

拉出我的头发.java -version并且javac -version两者报告相同的1.7.0_45,但是当我尝试编译最简单的类时,我得到一个类文件错误:

> cat A.java
public class A {}

> javac A.java
A.java:1: cannot access java.lang.Object
bad class file: /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/rt.jar(java/lang/Object.class)
class file has wrong version 51.0, should be 49.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
public class A {}
       ^
1 error

肯定没有安装JDK 1.5.我不认为有甚至是上OSX运行的任何更多的是1.5 JDK.

FWIW,这是包含"版本"和存根可执行文件的框架目录:

> ls -al /System/Library/Frameworks/JavaVM.framework/Versions/
total 64
drwxr-xr-x  11 root  wheel  374 28 Mar 09:03 .
drwxr-xr-x  12 root  wheel  408 11 Mar 07:52 ..
lrwxr-xr-x   1 root  wheel   10 29 Oct 12:54 1.4 -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 29 Oct 12:54 1.4.2 -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 29 Oct 12:54 1.5 -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 29 Oct 12:54 1.5.0 -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 29 Oct 12:54 1.6 -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 29 Oct 12:54 1.6.0 -> CurrentJDK
drwxr-xr-x   8 root  wheel  272 28 Mar 09:03 A
lrwxr-xr-x   1 root  wheel    1 29 Oct 12:54 Current -> A
lrwxr-xr-x   1 root  wheel    1 28 Mar 09:03 CurrentJDK -> A

我已经检查了通常的嫌疑人,没有JAVA_HOME或CLASSPATH环境变量,并没有安装没有1.5时这很重要.如果我安装JDK 8,我也会得到完全相同的行为.

有没有人知道造成这种情况的原因是什么？

Answer 1

好的,感谢这篇文章(Java编译错误:Mac)我找到了解决方案:

rm -rf ~/Library/Java/Extensions
sudo rm -rf /Library/Java/Extensions