java-gnome-developer

[Java-gnome-developer] starting with java-gnome

[Tomasz M. <tmi...@co...>]

Hello All

I'm thinking about starting a development with java-gnome. As a starter
I want to write some small tools just for myself as a proof-of-concept.
But before i really jump on it i have few questions:

1. Is it possible to use java collections (like Vector, Hashtable, etc)
with java-gtk/java-gnome. I ask bcoz i saw that gtk/glib is using it's
own list/maps implementation?

2. What about other java specific features/APIs and GTK? Can I, for
example use java Thread inside Java-GTK app? 

3. How is GObject related to generic java Object?

4. which version of javagtk is ok to start with? I use Ubuntu and it
ships with 2.8.3. Should i switch to the latest cvs to stay current?

5. Did someone tried to use jakarta subprojects inside GTK app(commoncs
for instance) and compile them with gcj?

Any reply to these questions will be appreciated.
TIA and regards.



--------t.m.--
Tomasz Mielnik

Re: [Java-gnome-developer] starting with java-gnome

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

On Sun, 2005-22-05 at 10:28 +0200, Tomasz Mielnik wrote: 
> I'm thinking about starting a development with java-gnome. As a starter
> I want to write some small tools just for myself as a proof-of-concept.

Good plan - it'll give you a sense of confidence in trying to use the
APIs.

> 1. Is it possible to use java collections (like Vector, Hashtable, etc)
> with java-gtk/java-gnome. I ask bcoz i saw that gtk/glib is using it's
> own list/maps implementation?

Yes. What you do with your data is your business. java-gnome's wrapping
of Glib/GTK+ data structures only matters for us when we come to do
ListViews and TreeViews (when you have to fill the GTK TreeModel of
information that drives the view) - and that is just what the API is.

> 2. What about other java specific features/APIs and GTK? Can I, for
> example use java Thread inside Java-GTK app? 

Erum, careful with that. The answer is "yes", but there are some thread
safety issues that come up with this (and every other) GUI Toolkit, as
they do all their updates within a single event loop which runs in a
"main" thread.

There are various references to "CustomEvents.addEvent()" floating
around - that's what you need to call from a worker thread if you want
to make GUI updates from outside of the GUI event loop thread.

> 3. How is GObject related to generic java Object?

Don't worry about it. Seriously - it's all just internals.

> 4. which version of javagtk is ok to start with? I use Ubuntu and it
> ships with 2.8.3. Should i switch to the latest cvs to stay current?

No. libgtk-java 2.4.9 [and optionally lib{gnome,glade,gconf}-java
2.8.3.1] are mostly fine (I've done development against them for over 6
months now).

You will find a *slightly* greater feature set in libgtk-java 2.6.2+
[and lib{gnome,glade,gconf}-java 2.10.1+ for that series], so upgrading
to that is fine when it (and the enormous stack of dependencies it
stands on) are available to you - but no rush.

Certainly, unless you're trying to hack on the bindings themselves,
there is no reason to grab CVS. If you were to, then grabbing the stable
branch (2.6/2.10) would be fine - HEAD stands on a *really* bleeding
edge dependency stack at the moment).

AfC
Sydney

-- 
Andrew Frederick Cowie

Technology strategy, managing change, establishing procedures,
and executing successful upgrades to mission critical business
infrastructure.

http://www.operationaldynamics.com/

Sydney   New York   Toronto   London

Re: [Java-gnome-developer] starting with java-gnome

[Ismael J. <ml...@ju...>]

On Sun, 2005-05-22 at 22:44 +1000, Andrew Cowie wrote:
> On Sun, 2005-22-05 at 10:28 +0200, Tomasz Mielnik wrote: 
[...]
> > 4. which version of javagtk is ok to start with? I use Ubuntu and it
> > ships with 2.8.3. Should i switch to the latest cvs to stay current?
> 
> No. libgtk-java 2.4.9 [and optionally lib{gnome,glade,gconf}-java
> 2.8.3.1] are mostly fine (I've done development against them for over 6
> months now).
> 
> You will find a *slightly* greater feature set in libgtk-java 2.6.2+
> [and lib{gnome,glade,gconf}-java 2.10.1+ for that series], so upgrading
> to that is fine when it (and the enormous stack of dependencies it
> stands on) are available to you - but no rush.
[...]

As far as I know there won't be new releases for the libgtk-java 2.4.x
branch or lib{gnome,glade,gconf}-java 2.8.x branch. So, be aware that no
bug-fixes will be made available for those branches.

So, if you have a choice, my advice is to use libgtk-java 2.6.2 and
lib{gnome,glade,gconf}-java 2.10.1 (or later releases when they become
available).

Regards,
Ismael

Re: [Java-gnome-developer] starting with java-gnome

[Ismael J. <is...@ju...>]

On Sun, 2005-05-22 at 22:44 +1000, Andrew Cowie wrote:
> On Sun, 2005-22-05 at 10:28 +0200, Tomasz Mielnik wrote: 
[...]
> > 4. which version of javagtk is ok to start with? I use Ubuntu and it
> > ships with 2.8.3. Should i switch to the latest cvs to stay current?
> 
> No. libgtk-java 2.4.9 [and optionally lib{gnome,glade,gconf}-java
> 2.8.3.1] are mostly fine (I've done development against them for over 6
> months now).
> 
> You will find a *slightly* greater feature set in libgtk-java 2.6.2+
> [and lib{gnome,glade,gconf}-java 2.10.1+ for that series], so upgrading
> to that is fine when it (and the enormous stack of dependencies it
> stands on) are available to you - but no rush.
[...]

As far as I know there won't be new releases for the libgtk-java 2.4.x
branch or lib{gnome,glade,gconf}-java 2.8.x branch. So, be aware that no
bug-fixes will be made available for those branches.

So, if you have a choice, my advice is to use libgtk-java 2.6.2 and
lib{gnome,glade,gconf}-java 2.10.1 (or later releases when they become
available).

Regards,
Ismael

[Java-gnome-developer] Re: starting with java-gnome

[Tom T. <tr...@re...>]

>>>>> "Tomasz" == Tomasz Mielnik <tmi...@co...> writes:

Tomasz> 1. Is it possible to use java collections (like Vector, Hashtable, etc)
Tomasz> with java-gtk/java-gnome. I ask bcoz i saw that gtk/glib is using it's
Tomasz> own list/maps implementation?

This roused my curiosity and I looked at org.gnu.glib.List and
org.gnu.glib.GListString.

Would it be useful for these to implement java.util.List?
Besides being more java-like, in 1.5 it would mean you could use one
as an argument to the new foreach construct.

Tomasz> 5. Did someone tried to use jakarta subprojects inside GTK app(commoncs
Tomasz> for instance) and compile them with gcj?

I haven't, but I don't think you'll have any real trouble doing this.
FWIW Eclipse uses gtk (not via java-gnome though) and several things
from the ASF (ant, tomcat, lucene at least) without problems.  If you
run FC4, a some of this stuff is already gcj-compiled in the distro.

Tom