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Old 03-23-2007, 12:56 PM   #1
marcoguillen
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Compiling and launching java from the terminal


Hello, i try to compile and make run my java files from terminal
I have installed the Sun jre 1.5 package that commes with the installation package of Linux and i have installed the new version the 1.6 from Sun too. Then i have the 2 version in my laptop (1.5 in /usr.... and the other one in /opt/....).
Previously i have set the path of the javac like that: export PATH=$PATH:/path/to/java/bin
Then, after compiling the file i try to launch the file and a message error is sent:

marco@marco-laptop:~/Project/JFiles> javac Cejemplo01.java
marco@marco-laptop:~/Project/JFiles> java Cejemplo01
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:620)
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$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
marco@marco-laptop:~/Project/JFiles>

its a simple code and i dont think i made a mistake doing that.

Thanks in advance
 
Old 03-23-2007, 01:02 PM   #2
jay73
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If you're going to do software development, you need jdk instead of jre.
 
Old 03-23-2007, 03:44 PM   #3
marcoguillen
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class Cejemplo01{
public static void main(java.lang.String[] args){ // or public static void main(String[] args){

System.out.println("Mi primera aplicacion en Java");
}
}
 
Old 03-24-2007, 02:06 AM   #4
Junior Hacker
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I'm no expert in this field, but allot of people don't set up Java correctly, on this web page is a link called "java runtime Plugin". The site is for Fedora 6, but the java set up should apply to most, pay attention to "Note" regarding compatible libraries, and under that is a section called "Controlling Java through 'alternatives'" which might tip you in the right direction.

http://www.mjmwired.net/resources/mj...-fc6.html#java
 
Old 03-24-2007, 03:08 PM   #5
whk
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You have too many curly brackets and also one is in the comments.
Edit appropriately.
 
Old 03-24-2007, 03:51 PM   #6
jay73
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Not true, the code is perfectly sound. I really don't see any superfluous brackets; sure, there is one in the comment but by definition anything appearing in comments gets ignored by the compiler - so there isn't any problem at all, really.

That being said, it's my understanding that this issue is solved; I think Marco posted this bit of code only to show it is.

Last edited by jay73; 03-24-2007 at 03:55 PM.
 
Old 03-25-2007, 03:33 AM   #7
marcoguillen
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i found the solution, i was using two different java version.
i just replace the java and javac from the usr/lib/ and now i can compile and run my java code.
Thanks for your replies
 
Old 03-25-2007, 03:43 AM   #8
jlo_sandog
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That works now, but the next time you have an update of gcj, its going to wipe those files. I don't use suse, but there's a proper way to set up java along with gcj. It's up to you to find out.
 
  


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