Mac OS X tries to launch jar with Java 1.5 although it needs 1.6

Question

I have a Java project which uses Java 1.6. I package a jar, the manifest simply states the Main-Class.

On the Mac, it fails to start since it tries to use 1.5 for it:

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375) 

Can I specify the 1.6 in the jar or do I need to alter the settings on the Mac?

Answer 1

如果您不想更改默认设置（尽管我建议切换到Java 6），只需从JDK / JRE 6安装中调用正确的Java运行时来启动它即可。