Simple java program can not be run

Question

I am trying to compile and run HelloWorld on linux machin with java version 1.6. I get it compiled but can not run it. I know that the program is at least correct.

Can anybody tell me how to get the silly program run?

I know even this problem had been metioned several times but nowhere found the fix of that problem. Compile command I used: javac ExampleProgram.java. Run Command I used: java ExampleProgram

//A Very Simple Example
class ExampleProgram {
  public static void main(String[] args){
    System.out.println("I'm a Simple Program");
  }
}

The error:

java -classpath . ExampleProgram
Exception in thread "main" java.lang.UnsupportedClassVersionError: ExampleProgram : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: ExampleProgram.  Program will exit.

You are compiling and running with different version of java — VirtualTroll
– VirtualTroll, Commented Mar 28, 2013 at 18:57
That does not help me much how to fix the problem. When I check the version of java, it tells me: java version "1.6.0_35" Java(TM) SE Runtime Environment (build 1.6.0_35-b10) Java HotSpot(TM) 64-Bit Server VM (build 20.10-b01, mixed mode) — MMAB
– MMAB, Commented Mar 28, 2013 at 19:00
How to fix it that compiling and running can be issued with the same version? — MMAB
– MMAB, Commented Mar 28, 2013 at 19:01

su- · Accepted Answer · 2013-03-28 19:04:03Z

2

Your program is compiled with JDK 1.7, but you are actually running it with an earlier version of Java.

If you are invoking the program in command line, type

java -version

to see which version of Java you are actually using.

Or, if you are using an editor like Eclipse, check out your Java settings.

Another solution is to use

javac -source 1.6 -target 1.6 SimpleProgram.java

instead of

javac SimpleProgram.java

answered Mar 28, 2013 at 19:04

su-

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5 Comments

MMAB Over a year ago

When I check the version of java, it tells me: java version "1.6.0_35" Java(TM) SE Runtime Environment (build 1.6.0_35-b10) Java HotSpot(TM) 64-Bit Server VM (build 20.10-b01, mixed mode)

su- Over a year ago

Also see this stackoverflow.com/questions/11964010/… I answered a similar question a while ago

su- Over a year ago

Can you delete the SimpleProgram.class file and try again with javac -source 1.6 -target 1.6 SimpleProgram.java? It should work.

Smit Over a year ago

@su- OPs Classname is class ExampleProgram

su- Over a year ago

I see. That's why. Thanks Smit. MMAB, as Smit pointed out, you were compiling class A and executing class B.

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