Netbeans compile and run, but I can't do it from the console...

chief_officer · 05-21-2006, 08:23 AM

Friends,

I have just downloaded Netbeans IDE 5.0 from Sun's website and installed it on my SuSE 10.0 box. I'm trying to play with java, but in the first minute I had a problem. Here is my code in the netbeans:

Code:

package javaapplication1;

public class Main {
    
    /** Creates a new instance of Main */
    public Main() 
    {
        }
     
    public static void main(String[] args) 
        {
        System.out.println("Hello World");
        }
    
}

When I compile and run the projects within Netbeans, the output is as follows:

Code:

init:
deps-jar:
compile:
run:
Hello World
BUILD SUCCESSFUL (total time: 0 seconds)

In the dist directory, there is a README.TXT file that tells me to type the following to run the program from the console:

Code:

java -jar "JavaApplication1.jar"

I get the following error messages:

Code:

Exception in thread "main" java.lang.UnsupportedClassVersionError: javaapplication1/Main (Unsupported major.minor version 49.0)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)

How can I run my applications from the console as Netbeans does? I don't understand why netbeans compile easily and my command doesn't?

Thanks for your assistance as always.

Regards.

dom83 · 05-21-2006, 09:43 AM

As far as I know this Exception is thrown when you are trying to run Byte Code wich was compiled for a newer VM.

Maybe you have an older JRE Version on your computer?

So you can do either:
- Remove all JRE packages (the development package JDK includes the java VM, so there is no need to have both JRE and JDK)
- Or you build your Byte Code for older Java versions. I don't know where you can tell Netbeans to do so (probably in the "project menu"?). But if you want to compile your source with javac you can use the option "-target".

Good luck,
Dominik

chief_officer · 05-22-2006, 01:41 AM

I have checked my JRE installations and it is 1_5_0. In my notebook JRE is not installed and the error messages are the same.