java-gnome-developer — For people using the bindings to write their own applications

Re: [Java-gnome-developer] Gtk.init throws exception when run on Ubuntu 13.04

[Johan G. <joh...@gm...>]

On 21/07/13 02:20, Andrew Cowie wrote:
> On Sat, 2013-07-20 at 00:38 +0100, Johan Groth wrote:
>> Hi,
>> I've just installed libjava-gnome-java on a Ubuntu 13.04 box (only
>> Linux dist I've got available). Fired up Eclipse Juno, added the
>> library to my project (and the docs of course) and tried to run it but
>> I'm getting an exception! What is going on here?
>
>> Exception in thread "main" java.lang.ExceptionInInitializerError
>>      at org.gnome.gtk.Gtk.init(Gtk.java:95)
> This is bizarre.
>
>> Caused by: java.lang.NullPointerException
>>      at
>> org.freedesktop.bindings.Plumbing.loadNativeCode(Plumbing.java:192)
>>      at org.freedesktop.bindings.Plumbing.<clinit>(Plumbing.java:110)
>>      ... 2 more
> Ok, that's more interesting.
>
> This means the code at line 191 returned null. [which is why I'm so
> particular about not chaining method calls]. So ProtectionDomain's
> getCodeSource() is returning null. That's annoying; . It doesn't here.
>
> What version of Java are you using? And, can you describe how you're
> running the program (from within Eclipse? from the command line?).
I'm running it from within Eclipse and using java7.
Same code running from within Netbeans 7.3.

DANGER: (null)-WARNING, Couldn't connect to accessibility bus: Failed to 
connect to socket /tmp/dbus-OZp7FBDLKz: Connection refused
Exception in thread "main" org.gnome.glib.FatalError: (null)-WARNING
Couldn't connect to accessibility bus: Failed to connect to socket 
/tmp/dbus-OZp7FBDLKz: Connection refused
     at org.gnome.gtk.GtkMain.gtk_init(Native Method)
     at org.gnome.gtk.GtkMain.init(GtkMain.java:54)
     at org.gnome.gtk.Gtk.init(Gtk.java:95)
     at 
uk.org.linuxgrotto.ui.DesktopFileEditor.main(DesktopFileEditor.java:15)
Java Result: 1

java version "1.7.0_25"
OpenJDK Runtime Environment (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.13.04.2)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

Regards,
Johan

Re: [Java-gnome-developer] Gtk.init throws exception when run on Ubuntu 13.04

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

On Sat, 2013-07-20 at 00:38 +0100, Johan Groth wrote:
> Hi,
> I've just installed libjava-gnome-java on a Ubuntu 13.04 box (only
> Linux dist I've got available). Fired up Eclipse Juno, added the
> library to my project (and the docs of course) and tried to run it but
> I'm getting an exception! What is going on here?


> Exception in thread "main" java.lang.ExceptionInInitializerError
>     at org.gnome.gtk.Gtk.init(Gtk.java:95)

This is bizarre.

> Caused by: java.lang.NullPointerException
>     at
> org.freedesktop.bindings.Plumbing.loadNativeCode(Plumbing.java:192)
>     at org.freedesktop.bindings.Plumbing.<clinit>(Plumbing.java:110)
>     ... 2 more

Ok, that's more interesting.

This means the code at line 191 returned null. [which is why I'm so
particular about not chaining method calls]. So ProtectionDomain's
getCodeSource() is returning null. That's annoying; . It doesn't here.

What version of Java are you using? And, can you describe how you're
running the program (from within Eclipse? from the command line?).

AfC
Sydney

Re: [Java-gnome-developer] Gtk.init throws exception when run on Ubuntu 13.04

[Johan G. <joh...@gm...>]

On 20/07/13 13:37, Guillaume Mazoyer wrote:
> Hi,
>
> 2013/7/20 Johan Groth <joh...@gm...>:
>> I've just installed libjava-gnome-java on a Ubuntu 13.04 box (only Linux
> Do you have libjava-gnome-jni installed too?
I do indeed.

$ ll /usr/lib/lib*jni*
lrwxrwxrwx 1 root root 22 Jul 19 22:53 /usr/lib/libgtkjni-4.1.2.so -> 
jni/libgtkjni-4.1.2.so

$ ll /usr/lib/jni/lib*
-rw-r--r-- 1 root root 1208816 Sep 10  2012 /usr/lib/jni/libgtkjni-4.1.2.so
-rw-r--r-- 1 root root   72232 Jun  6  2011 /usr/lib/jni/libjnidispatch.so

Regards,
Johan

Re: [Java-gnome-developer] Gtk.init throws exception when run on Ubuntu 13.04

[Guillaume M. <res...@gm...>]

Hi,

2013/7/20 Johan Groth <joh...@gm...>:
> I've just installed libjava-gnome-java on a Ubuntu 13.04 box (only Linux
Do you have libjava-gnome-jni installed too?

Regards,

--
Guillaume Mazoyer - https://respawner.fr/

[Java-gnome-developer] Gtk.init throws exception when run on Ubuntu 13.04

[Johan G. <joh...@gm...>]

Hi,
I've just installed libjava-gnome-java on a Ubuntu 13.04 box (only Linux 
dist I've got available). Fired up Eclipse Juno, added the library to my 
project (and the docs of course) and tried to run it but I'm getting an 
exception! What is going on here?
The program is this:

package uk.org.linuxgrotto.ui;

import org.apache.log4j.Logger;
import org.gnome.gtk.Gtk;

/**
  * The class instantiates the main window.
  *
  * @author jgroth
  *
  */
public class DesktopFileCreator {

     private static Logger log = Logger.getLogger(DesktopFileCreator.class);

     public static void main(String[] args) {
         Gtk.init(args);
     }
}

Exception in thread "main" java.lang.ExceptionInInitializerError
     at org.gnome.gtk.Gtk.init(Gtk.java:95)
     at 
uk.org.linuxgrotto.ui.DesktopFileCreator.main(DesktopFileCreator.java:63)
Caused by: java.lang.NullPointerException
     at org.freedesktop.bindings.Plumbing.loadNativeCode(Plumbing.java:192)
     at org.freedesktop.bindings.Plumbing.<clinit>(Plumbing.java:110)
     ... 2 more

This is so minimal it can't be any smaller and yet an exception.

Regards,
Johan

Re: [Java-gnome-developer] on event occurs when invoking org.gnome.gtk.Test.sendClick

[Alexey T. <a.m...@gm...>]

Is there any solution on this problem?

Re: [Java-gnome-developer] on event occurs when invoking org.gnome.gtk.Test.sendClick

[Alexey T. <a.m...@gm...>]

Yes, I ran java-gnome tests and they passed fine. But I didn't find usage
of sendClick method...
This code should to press button "TEST". After that clicked[0] should be
true. But it is false...

        Window window;
        final boolean[] clicked = new boolean[]{false};
        final Button button;
        Gtk.init(new String[]{});
        window = new Window();
        Box box = new Box(Orientation.HORIZONTAL, 3);
        button = new Button("TEST");
        box.add(button);
        button.connect(new Clicked() {

            @Override
            public void onClicked(Button source) {
                clicked[0] = true;
            }
        });
        window.add(box);
        window.showAll();
        Glib.idleAdd(new Handler() {

            @Override
            public boolean run() {
                org.gnome.gtk.Test.sendClick(button, MouseButton.LEFT,
ModifierType.NONE);
                System.out.println(clicked[0]);
                return false;
            }
        });
        Gtk.main();

Re: [Java-gnome-developer] on event occurs when invoking org.gnome.gtk.Test.sendClick

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

On Fri, 2013-06-14 at 13:56 +0400, Alexey Titov wrote:
> I'm trying to invoke 
> org.gnome.gtk.Test.sendClick(
> button, MouseButton.LEFT, ModifierType.NONE). Mouse pointer moves to
> the button, but no onClick event occurs. I can't understand what is
> wrong. Please help...

I haven't tested org.gnome.gtk.Test in a while; it's possible X server
or other changes have caused it to break.

[I'm assuming java-gnome's test suite is working for you? If you haven't
tried it might be worth a shot just to check everything else is working]

Can you post a small runnable code fragment somewhere that shows what
you're trying to do? Happy to try it for you.

AfC
Sydney

[Java-gnome-developer] on event occurs when invoking org.gnome.gtk.Test.sendClick

[Alexey T. <a.m...@gm...>]

Hello. I'm trying to make a simple test with one button and Clicked event
handler. I'm trying to invoke
org.gnome.gtk.Test.sendClick(
button, MouseButton.LEFT, ModifierType.NONE). Mouse pointer moves to the
button, but no onClick event occurs. I can't understand what is wrong.
Please help...

[Java-gnome-developer] Derive a container

[Big G. <ear...@gm...>]

Hi list,

I managed to get Eclipse working with Java Gnome. Now I want to derive
my own container widget, and customise the drawing of it somewhat.

Is there any documentation for how to do this? There's loads for
Gtkmm ...

For anyone wondering about Java Gnome on Fedora, I installed the
packages, and had to copy the jar to my home directory and chown it,
otherwise Eclipse blew up and didn't recognise the jar file. Then you
right click the jar, and add the path to the Javadoc.

Anyway, any help with containers would be great.

Ta,

Gaz

[Java-gnome-developer] java-gnome 4.1.3 released

[Guillaume M. <res...@gm...>]

As you might have seen the 4.1.3 version is out!

Release notes
http://java-gnome.sourceforge.net/NEWS.html#4.1.3

Tarball
http://ftp.gnome.org/pub/gnome/sources/java-gnome/4.1/java-gnome-4.1.3.tar.xz

Up-to-date Ubuntu (for 12.04, 12.10 and 13.04) packages are also available
in our PPA
https://launchpad.net/~java-gnome/+archive/ppa

-- 
Guillaume Mazoyer - https://respawner.fr/ <http://respawner.fr/>

[Java-gnome-developer] Eclipse

[Big G. <ear...@gm...>]

Hi,

I've been trying to use java-gnome with Eclipse and getting nowhere.

I installed java-gnome on Fedora, fired up eclipse, pasted one of your
example classes in and added the gtk JAR file to the build path.

But, I still get ...

 The import org.gnome cannot be resolved

Any thoughts?

[Java-gnome-developer] (no subject)

[iamamoocow d. <lis...@ya...>]

http://www.peche-stergoz.com/pulqjtrc/5se/zev987pk

[Java-gnome-developer] (no subject)

[iamamoocow d. <lis...@ya...>]

http://www.orthoreliefhospital.com/vvbry/madfsc/1f619/bw297dqn/opy

[Java-gnome-developer] Strange signal binding in GtkCellRenderer

[Alexey T. <a_t...@ma...>]

 Hello!
Hi I'm trying to explore java-gnome sources. I found one strange thing. In GtkCellRenderer.java there is a following code:

    static final void connect(CellRenderer self, GtkCellRenderer.RenderSignal handlerInstance, boolean after) {
        connectSignal(self, handlerInstance, GtkCellRenderer.class, "render", after);
    }

However, there is no signal "render" in GtkCellRenderer according to GTK documentation. Is this an error or I just don't understand something? Thank you.

[Java-gnome-developer] Hello.

[iamamoocow d. <lis...@ya...>]

http://www.catherine-perrier.com/qnxsq/1d3kin0rllbnu2lm6jpjw0comumhqjhz.png

Re: [Java-gnome-developer] How to send key press event using java?

[Niranjan R. <nh...@gm...>]

On 01/20/2013 07:37 PM, Andrew Cowie wrote:
> <http://java-gnome.sourceforge.net/doc/api/4.1/org/gnome/gtk/Test.html#sendKey(org.gnome.gtk.Widget, org.gnome.gdk.Keyval, org.gnome.gdk.ModifierType)>
>
> might be what you want, though, as mentioned that's very much for
> testing.
>
> If you're trying to "make something happen" that's bound to a keystroke,
> then you might be better off with Actions and triggering the action()
> directly.
>
> AfC
> Sydney
>
>
>
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> _______________________________________________
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Thank you. As you mentioned I am trying to "make something happen". 
Unfortunately call is deep inside webkit and webkit gtk does not expose 
any API for that. Right now only way seems to be sending key/mouse 
events but I'll keep investigating.

Regards,

Niranjan

Re: [Java-gnome-developer] How to send key press event using java?

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

<http://java-gnome.sourceforge.net/doc/api/4.1/org/gnome/gtk/Test.html#sendKey(org.gnome.gtk.Widget, org.gnome.gdk.Keyval, org.gnome.gdk.ModifierType)>

might be what you want, though, as mentioned that's very much for
testing.

If you're trying to "make something happen" that's bound to a keystroke,
then you might be better off with Actions and triggering the action()
directly.

AfC
Sydney

[Java-gnome-developer] How to send key press event using java?

[Niranjan R. <nh...@gm...>]

Greetings,

I would like to do something similar to 
http://stackoverflow.com/questions/6796191/how-to-send-key-events-to-webkit-webview-control 
or similar to copied answer from stack overflow question. I could see 
the handlers for receiving events, but could not see anything that can 
emit the events. How can I achieve this?

event = gtk.gdk.Event(gtk.gdk.KEY_PRESS)
event.keyval = gtk.keysyms.Return
event.time = 0
browser.emit('key-press-event', event)


Regards,

Niranjan

Re: [Java-gnome-developer] GTK Warnings

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

Hi Niranjan,

On Thu, 2013-01-10 at 13:30 -0800, Niranjan Rao wrote:
> Seems like java-gnome treats like GTK warnings as fatal errors. 

That's true.

The reason is that a Gtk-WARNING is an indication that an illegal
argument was passed to a function. How is the program supposed to
continue if that has been done?

More to the point, in Java we debug uncaught exceptions aka programming
errors by seeing a stack trace that takes us right through the code path
that led from the developer's mistake to the code which checked for the
condition.

We do our best to have guards in the bindings layer, but there are a
fair number of conditions which arise because of mistakes that don't
become apparent until runtime due to the very dynamic nature of GTK.

Anyway, yes: to make java-gnome fit in to Java programming better,
WARNINGs are converted to unchecked exceptions.
 

> Is there 
> any flag that I can use to say log the warning, but don't treat it as 
> fatal error.

No there isn't. We can have a conversation on java-gnome-hackers if you
want to talk about engineering a different solution to this, but you'd
have to answer the question of how what you want to do is better than
the programmer getting an unchecked exception that they have to deal
with so as to correct their code.

> I have integrated webkit and in general it works fine and I get most of 
> the functionality of web kit I care to have. Depending upon what we are 
> doing, sometime we have to enable WBKIT_DEBUG flag and use it with 
> webkit debug version. If we switch webkit to standard library and forget 
> to remove the WEBKIT_DEBUG flag, webkit just logs a warning about log 
> not being available. This causes java gnome to crash.

Sounds like it is doing the right thing? If you the programmer have
forgotten to do something, shouldn't the program terminate?

> We would prefer to 
> see those warning so that we know what's happening.
> Normally you will get the warnings on stdout/stderr, but our code runs 
> with daemon/xvfb combo

Shouldn't the output end up in ~/.xsession-errors, then?

AfC
Sydney

Re: [Java-gnome-developer] How to use a Glade UI (.glade file) in a Java Gnome/GTK program?

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

On Mon, 2013-01-14 at 09:11 -0200, Igor H. Vieira wrote:
> I've did a research on the Internet looking for
> tutorials/documentations

In the java-gnome source tree there is an example at
tests/prototype/Designer.java ; you might have a look at that and give
it a try?

> I already know how to create a UI from the code using the Java
> Gnome/GTK.

You're probably better off just doing that, then. To be honest, that's
what we tend to recommend; Glade always seems like such a great idea,
but pretty soon you end up needing to write code to do non-trivial work
anyway, at which point the complexity of dealing with .ui files & code
is greater than just having code.

Speaking personally,

        button = new Button();
        button.setLabel("Hello");

and 

        button = (Button) builder.getObject("button42")
        button.setLabel("Hello");

amounts to much the same thing while the latter is definitely more
fragile in the face of change. IMHO, anyway.

AfC
Sydney

[Java-gnome-developer] How to use a Glade UI (.glade file) in a Java Gnome/GTK program?

[Igor H. V. <zig...@gm...>]

I've did a research on the Internet looking for tutorials/documentations to
explain me how to use a UI designed in Glade in a Java Gnome project, but
no luck. I already know how to create a UI from the code using the Java
Gnome/GTK. Anyway, I'd like to use a Glade UI that I've created in a Java
Gnome/Gtk project, but I have no idea from where to start. Please tell me:

 - which packages I need to install;

 - how to integrate the UI I've create with Glade (the .glade file) with my
Java Gnome/Gtk project (specifically in Eclipse);

 - and give an example.

Thanks in advance.


That's how my Glade UI looks (Just click the image to see it bigger):

http://i.stack.imgur.com/cgX9C.png

This is the XML code of the UI above:

    <?xml version="1.0" encoding="UTF-8"?>
    <interface>
      <!-- interface-requires gtk+ 3.0 -->
      <object class="GtkWindow" id="window1">
        <property name="can_focus">False</property>
        <property name="window_position">center</property>
        <child>
          <object class="GtkFixed" id="fixed1">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <child>
              <object class="GtkEntry" id="entry1">
                <property name="width_request">162</property>
                <property name="height_request">25</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="halign">start</property>
                <property name="valign">end</property>
                <property name="invisible_char">•</property>
              </object>
              <packing>
                <property name="x">11</property>
                <property name="y">49</property>
              </packing>
            </child>
            <child>
              <object class="GtkEntry" id="entry2">
                <property name="width_request">162</property>
                <property name="height_request">25</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="halign">start</property>
                <property name="valign">end</property>
                <property name="invisible_char">•</property>
                <property name="invisible_char_set">True</property>
              </object>
              <packing>
                <property name="x">271</property>
                <property name="y">49</property>
              </packing>
            </child>
            <child>
              <object class="GtkLabel" id="label">
                <property name="height_request">25</property>
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="label" translatable="yes">*</property>
              </object>
              <packing>
                <property name="x">216</property>
                <property name="y">49</property>
              </packing>
            </child>
            <child>
              <object class="GtkButton" id="button">
                <property name="label"
translatable="yes">Calculate!!!</property>
                <property name="use_action_appearance">False</property>
                <property name="width_request">84</property>
                <property name="height_request">27</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
                <property name="use_action_appearance">False</property>
              </object>
              <packing>
                <property name="x">181</property>
                <property name="y">93</property>
              </packing>
            </child>
          </object>
        </child>
      </object>
    </interface>

[Java-gnome-developer] GTK Warnings

[Niranjan R. <nh...@gm...>]

Seems like java gnome treats like GTK warnings as fatal errors. Is there 
any flag that I can use to say log the warning, but don't treat it as 
fatal error.

I have integrated webkit and in general it works fine and I get most of 
the functionality of web kit I care to have. Depending upon what we are 
doing, sometime we have to enable WBKIT_DEBUG flag and use it with 
webkit debug version. If we switch webkit to standard library and forget 
to remove the WEBKIT_DEBUG flag, webkit just logs a warning about log 
not being available. This causes java gnome to crash. We would prefer to 
see those warning so that we know what's happening.

Normally you will get the warnings on stdout/stderr, but our code runs 
with daemon/xvfb combo and we don't have stdout/stderror always readable.

Regards,

Niranjan

[Java-gnome-developer] Why are GTK bindings not a standalone release?

[Maarten B. <boe...@ya...>]

Hi all,

I was wondering why the GTK bindings are not a separate standalone 
release from the Gnome bindings. Just as GTK is a popular toolkit for 
building user interfaces with Python *but without gnome*, they could 
become a popular alternative for Java and JVM-based scripting languages 
as well. It would also allow a release on Windows where the Gnome 
libraries are not available (but the GTK libs and its dependencies are).

Maarten

[Java-gnome-developer] X Window System Interaction

[Billy B. <84....@gm...>]

Hi,

I am going to write a map viewer application and use DrawingArea to draw 
map with its overlays.
The map render library is written in C and I am starting to write its 
JNI wrapper.
The wrapper will be periodically invoked in the ExposeEvent and needs to 
access some X11 objects, like Display, Screen, Window, Colormap, etc, 
which are created by java-gnome.
Is there any way to access it because I haven't found the corresponding 
methods of these functions 
(http://developer.gnome.org/gdk/unstable/gdk-X-Window-System-Interaction.html) 
?
I'm using java-gnome 4.0.20

Best Regards,
Billy