[Bluej-discuss] 7.47 creating jars - linux problem

[Bryan J. Higgs]

First, make sure that your java really is the proper version.  Type in 
the following:

    java -version
      

The first line of the output should tell you the version of Java you're 
running.  Here's what my Java 1.5 version (on Microsoft Windows XP) 
outputs in response to the above command:

    java version "1.5.0"
    Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
    Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode)
      

I suspect that you'll probably find that your version is less than 1.5.  
If that's true, then you need to fix your path to point to the proper 
Java version's bin directory.

Regarding the second problem:

    * Since you appear to be running on U/Linux, try using:

    ./java -jar /home/icedearth/test.jar
      

    to ensure that you're really running the java that is in that
    (current working) directory

    * It looks like you might have a main class specified, but you may
      not have the correct set of prerequisites
         1. The class must be a *public *class
         2. The signature of the main method must be:

        *public static void main(String[] args)*
            

        If you omit any of these items, Java won't recognize you main as
        a real main entry point.
        A common mistake is to omit the static keyword.  Another is to
        omit the public keyword.

I hope that helps!

Bryan

ric104 wrote:
> Thanks for that, I solved it by running BlueJ as root
>
> The problem Im haivng now is when i run "java -jar whatever.jar" I am getting the following message:
>
> Exception in thread "main" java.lang.UnsupportedClassVersionError: Game (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)
>
> Ouch!
>
> And here is what is says when I actually use java 5
>
> root at icedearth[/usr/lib/jvm/java-1.5.0-sun/bin]# java -jar /home/icedearth/test.jar
> no suitable method `main' in class
> root at icedearth[/usr/lib/jvm/java-1.5.0-sun/bin]#
>
> I have checked that main exists and run it in BlueJ ok, any ideas?
>
> Thanks
>
> Roland
>
>
>
>
> On Tue, 21 Nov 2006 20:49:03 -0500, "Josh Rountree" <mage at carolina.rr.com> wrote:
>   
>> Sounds like you need to add execute to the directory you are saving too,
>> that will allow it to be opened.
>>
>> -----Original Message-----
>> From: bluej-discuss-bounces at bluej.org
>> [mailto:bluej-discuss-bounces at bluej.org] On Behalf Of ric104
>> Sent: Tuesday, November 21, 2006 5:16 PM
>> To: General discussion for users of BlueJ
>> Subject: [Bluej-discuss] 7.47 creating jars - linux problem
>>
>> Hi
>>
>> I am using BlueJ with Debian Sarge, but everytime I try to save or create
>> a
>> jar i get the message:
>> The jar file could not be written (check the file system for access rights
>> and disk space availability)
>>
>> I have given the bluej directory and bluej.sh read write and execute
>> rights
>> and made the directory I am saving in read and write for everyone, but
>> still
>> i have this problem.  I dont seem to have this problem with any other app
>> similar to blue j (i.e run from a .sh, as Google Earth works fine)
>>
>> Has anyone else had these probs in LInux, its creating the jar manifest
>> file
>> and thats it. very odd.
>>
>> Thanks
>>
>> Roland Clothier
>> 2nd Year ITO Student
>> University of Southampton
>>
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>
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