找不到主类:Main,应用程序将退出

Question

我有Main.java,看起来像这样:

public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) throws UnsupportedEncodingException {
        // TODO Auto-generated method stub
        System.out.println("here!");
    }

}

我编译它:

javac Main.java

并尝试运行它

java Main

它会因以下例外而死:

Exception in thread "main" java.lang.UnsupportedClassVersionError: Main : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: Main. Program will exit.

java -version是:

java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.3) (6b24-1.11.3-1ubuntu0.12.04.1)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

我在Ubuntu服务器上运行它.

我究竟做错了什么？

UPDATE

javac -version 是

javac 1.7.0_03

which java

/usr/bin/java

which javac

/usr/bin/javac

Answer 1

你想运行在Java 6,但它看起来像你编译使用Java 7.

跑

javac -version

检查......并假设它显示的Java 7,你需要制定出为什么这两个是不同的.

运行

$ which java
$ which javac

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