java-gnome-developer

[Java-gnome-developer] Problems running programs

[Bruno D. <bdu...@be...>]

Hi,

I must be the dumbest man in the world but I cannot compile/run any
Java-Gnome program, whether it's with Eclipse or not !

I'm running Debian/Sid with Sun's JDK 1.4
Jar's are in /usr/share/java :

bdusauso@Tu-144:~/workspace/First$ ls  /usr/share/java
docbook-xsl-saxon651-1.66.1.jar  gnome2.8-2.8.2.jar
gtk2.4-2.4.6.jar
docbook-xsl-saxon65-1.66.1.jar   gnome2.8.jar              gtk2.4.jar
docbook-xsl-saxon651.jar         gnomevfs2.7-2.7.4.jar
gtkhtml2.4-2.4.3.jar
docbook-xsl-saxon65.jar          gnomevfs2.7.jar
gtkhtml2.4.jar
docbook-xsl-xalan25-1.66.1.jar   gnomevte0.11-0.11.13.jar
docbook-xsl-xalan25.jar          gnomevte0.11.jar

And the .so's are in /usr/lib/jni :

bdusauso@Tu-144:~/workspace/First$ ls /usr/lib/jni
libgnomejar2.8.so              libgnomevtejava0.11.so
libgnomejar2.8.so.2.8.2        libgnomevtejava0.11.so.0.11.13
libgnomejava2.8.so             libgtkhtmljar2.4.so
libgnomejava2.8.so.2.8.2       libgtkhtmljar2.4.so.2.4.3
libgnomevfsjar2.7.so           libgtkhtmljava2.4.so
libgnomevfsjar2.7.so.2.7.4     libgtkhtmljava2.4.so.2.4.3
libgnomevfsjava2.7.so          libgtkjar2.4.so
libgnomevfsjava2.7.so.2.7.4    libgtkjar2.4.so.2.4.6
libgnomevtejar0.11.so          libgtkjava2.4.so
libgnomevtejar0.11.so.0.11.13  libgtkjava2.4.so.2.4.6

The program is the first one from the tutorial, that is :

My CLASSPATH is as follows :

bdusauso@Tu-144:~/workspace/First$ echo $CLASSPATH
/usr/lib/j2se/1.4/jre/lib/rt.jar:/usr/share/java:.

bdusauso@Tu-144:~/workspace/First$ cat First.java

import org.gnu.gnome.App;
import org.gnu.gnome.Program;
import org.gnu.gtk.Gtk;

public class First {

        public static void main(String[] args) {
        // Initialization
        Program.initGnomeUI("First", "0.1", args);

        App app = new App("First", "First App");
        app.show();

        Gtk.main();
        }
}

So, when trying "javac First.java", I run into troubles ;) :

bdusauso@Tu-144:~/workspace/First$ javac First.java
First.java:14: package org.gnu.gnome does not exist
import org.gnu.gnome.App;
                     ^
First.java:15: package org.gnu.gnome does not exist
import org.gnu.gnome.Program;
                     ^
First.java:16: package org.gnu.gtk does not exist
import org.gnu.gtk.Gtk;
                   ^
First.java:22: cannot resolve symbol
symbol  : variable Program
location: class First
        Program.initGnomeUI("First", "0.1", args);
        ^
First.java:24: cannot resolve symbol
symbol  : class App
location: class First
        App app = new App("First", "First App");
        ^
First.java:24: cannot resolve symbol
symbol  : class App
location: class First
        App app = new App("First", "First App");
                      ^
First.java:27: cannot resolve symbol
symbol  : variable Gtk
location: class First
        Gtk.main();
        ^
7 errors

It seems javac don't find the packages, but my parameters (CLASSPATH
especially) are right, no ?


Another problem is when running Eclipse. I've set it up like shown in 

http://java-gnome.sourceforge.net/cgi-bin/bin/view/Main/EclipseDevelopment

But, when running, Eclipse tells me :

Exception in thread "main"
java.lang.UnsatisfiedLinkError: /usr/lib/jni/libgnomejava2.8.so.2.8.2:
libgtkjava2.4.so: cannot open shared object file: No such file or
directory
	at java.lang.ClassLoader$NativeLibrary.load(Native Method)
	at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1586)
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1511)
	at java.lang.Runtime.loadLibrary0(Runtime.java:788)
	at java.lang.System.loadLibrary(System.java:834)
	at org.gnu.gnome.Program.<clinit>(Program.java:74)
	at First.main(First.java:22)


I'm sure i'm doing all things the wrong way, but I don't know how to do
it right :)
Is there a good soul who can help me ?

Regards.
-- 
Bruno Dusausoy <bdu...@be...>
aka Thx1138

Re: [Java-gnome-developer] Problems running programs

[Jeff M. <ku...@gm...>]

On Tue, 08 Mar 2005 14:08:06 +0100, Bruno Dusausoy
<bdu...@be...> wrote:
> My CLASSPATH is as follows :
> 
> bdusauso@Tu-144:~/workspace/First$ echo $CLASSPATH
> /usr/lib/j2se/1.4/jre/lib/rt.jar:/usr/share/java:.
> 

...

> It seems javac don't find the packages, but my parameters (CLASSPATH
> especially) are right, no ?

The problem here is that the Java-GNOME libraries are not in your
classpath.  You need to add the gtk and gnome jar files to your classpath
in order to compile this example.

> But, when running, Eclipse tells me :
> 
> Exception in thread "main"
> java.lang.UnsatisfiedLinkError: /usr/lib/jni/libgnomejava2.8.so.2.8.2:
> libgtkjava2.4.so: cannot open shared object file: No such file or
> directory
>         at java.lang.ClassLoader$NativeLibrary.load(Native Method)
>         at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1586)
>         at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1511)
>         at java.lang.Runtime.loadLibrary0(Runtime.java:788)
>         at java.lang.System.loadLibrary(System.java:834)
>         at org.gnu.gnome.Program.<clinit>(Program.java:74)
>         at First.main(First.java:22)
> 
> I'm sure i'm doing all things the wrong way, but I don't know how to do
> it right :)
> Is there a good soul who can help me ?
> 

There is a simple solution for this issue as well.  The example
cannot find the Java-GNOME shared objects to load them
at runtime.  You can resolve this by either adding the path
to the shared objects to your LD_LIBRARY_PATH env variable
or you can specify -Djava.library.path=/usr/lib/jni as a VM
argument.  This VM argument is set up in the run dialog of eclipse
by selecting the Arguments tab.

-- 
Jeffrey Morgan

"The highest reward for a man's toil is not
what he gets for it, but what he becomes by it"
    - Jon Ruskin

Re: [Java-gnome-developer] Problems running programs

[Clint A. <ca...@au...>]

Bruno Dusausoy said:
> Hi,
>
> I must be the dumbest man in the world but I cannot compile/run any
Java-Gnome program, whether it's with Eclipse or not !

I don't think so, just uninformed. ;-)

[snip]
> My CLASSPATH is as follows :
>
> bdusauso@Tu-144:~/workspace/First$ echo $CLASSPATH
> /usr/lib/j2se/1.4/jre/lib/rt.jar:/usr/share/java:.

Here is your first problem.  When adding .jar files to your classpath, you
must specify each file individually, like this:

/usr/share/java/gtk2.4.jar:/usr/share/java/gnome.jar:...etc.

Putting just /usr/share/java won't work.  Fix this and you'll fix the
majority of your problems.

[snip]
> Another problem is when running Eclipse. I've set it up like shown in
>
> http://java-gnome.sourceforge.net/cgi-bin/bin/view/Main/EclipseDevelopment
>
> But, when running, Eclipse tells me :
>
> Exception in thread "main"
> java.lang.UnsatisfiedLinkError: /usr/lib/jni/libgnomejava2.8.so.2.8.2:
libgtkjava2.4.so: cannot open shared object file: No such file or
directory
> 	at java.lang.ClassLoader$NativeLibrary.load(Native Method)
> 	at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1586)
> 	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1511)
> 	at java.lang.Runtime.loadLibrary0(Runtime.java:788)
> 	at java.lang.System.loadLibrary(System.java:834)
> 	at org.gnu.gnome.Program.<clinit>(Program.java:74)
> 	at First.main(First.java:22)
>
>

This one is more tricky to figure out, but easy to fix.  In Eclipse, open
up the Run... dialog and click on the Environment tab.  Click the New
button to add a new environment variable:

Name: LD_LIBRARY_PATH
Value: /usr/lib/jni

That should do it.  Write back if you have more problems.