java-gnome-developer

[Java-gnome-developer] how to specify classpath

[한. <yut...@gm...>]

I use Sun java from debian.

// example.java
import javax.swing.JTextField;

public void .... {
.. blah.. blah..
}
//end of example.java

as you know(s) `javac example.java` works.
because probably javax packages were registered by sun java, some
where as global settings (classpath).

To compile 'ExamplePressMe.java'; downloaded from
'http://java-gnome.sourceforge.net/4.0/doc/examples/button/ExamplePressMe.html';
'javac ExamplePressMe.java' shows error that It can't find where they are.

My error :
$ javac ExamplePressMe.java -classpath /usr/share/java
ExamplePressMe.java:13: package org.gnome.gdk does not exist
import org.gnome.gdk.Event;

Debian :
'libjava-gnome-java' distribution package contains gnome/gtk jars in
/usr/share/java

$ jar tf /usr/share/java/gtk.jar | more
.. blah.. blah..

org/gnome/gdk/GdkExtensionMode.class
org/gnome/gdk/EventExpose.class
org/gnome/gdk/GdkGravity.class
org/gnome/gdk/Keyval.class
org/gnome/gdk/GdkInputMode.class

Would you tell me how I can make javac recognize these classpath, plz?

Re: [Java-gnome-developer] how to specify classpath

[Andrew C. <an...@op...>]

I assume you had a look at the README file that comes with java-gnome.
It has further examples of running code:
http://java-gnome.sourceforge.net/4.0/README.html#using
but the problem you're having is fairly simple to address.

On Tue, 2008-07-01 at 04:12 +0900, 한정훈 wrote:
> $ javac ExamplePressMe.java -classpath /usr/share/java

Although Java searches paths for hierarchies of .class files, it does
not load .jar files. You have to specify them by name. 

$ cd doc/examples/
$ javac -classpath /usr/share/java/gtk-4.0.jar button/ExamplePressMe.java

And to run it,

$ java -client -ea -classpath /usr/share/java/gtk-4.0.jar:. button.ExamplePressMe

[You may need to add -Djava.library.path=/usr/lib/jni on Debian; I'm
not sure if that's on the default system linker search path]

Yes, this is all a bit verbose, but unfortunately that's the way Java
is.

++

Or you could do it all from another location:

$ javac -classpath /usr/share/java/gtk-4.0.jar -d /tmp/examples /path/to/java-gnome/doc/examples/button/ExamplePressMe.java
$ java -client -ea -classpath /usr/share/java/gtk-4.0.jar:/tmp/examples -Djava.library.path=/usr/lib/jni button.ExamplePressMe

Hopefully you see the pattern now.

++

If you were build java-gnome from source yourself, you would find that
`make test` also builds the example code (and puts the resulting .class
files in tmp/tests/). so,

$ java -client -ea -classpath tmp/gtk-4.0.jar:tmp/tests/ -Djava.library.path=tmp button.ExamplePressMe

would run it for you.

Good luck,

AfC
Sydney

-- 
Andrew Frederick Cowie

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