Re: Modular rpc blues

Coelho Thu, 23 Dec 2010 01:42:51 -0800

I checked the content and I have the servlet tag in a the module descriptor
            ( Check the contents of the .jar file. Does it contain the module 
descriptor? Does the module descriptor contain <servlet> tags for the RPCs? )

I wonder if it is not a matter of gwt-maven-plugin version
because the all sample compiles once and the version was 1.3-SNAPSHOT , if my
memory is not failing

then I had compilation problems ( not with thi project I think )
so I cleared my maven local repository
then from this moment on It complained about 1.3-SNAPSHOT that could not be
found
so I changed to 2.1.0-1

this morning I reversed back to 1.3-SNAPSHOT : it compiles again ! an runs

why not with 2.1.0-1 ?

Thanks for reading
Patrick

----- Original Message -----
From: Andreas Horst
To: [email protected]
Sent: Wednesday, December 22, 2010 6:55 PM
Subject: Re: Modular rpc blues

Don't worry.

I know this is not a trivial but nonetheless vital aspect of efficient
development of reusable GWT modules. I also think that these topics are not
well documented, at least at the time I found myself struggling with GWT module
inheritance (+ Maven).

2010/12/22 Coelho <[email protected]>

I'll Check and let you know
sorry for the trouble

Patrick
----- Original Message -----
From: Andreas Horst
To: [email protected]
Sent: Wednesday, December 22, 2010 6:41 PM
Subject: Re: Modular rpc blues

Alright, now I get it!

To bundle RPC functionality in a reusable (.jar) GWT module you only need
to declare any RPC servlet in the module's module descriptor. That's all.
"gwt:mergewebxml" will create appropriate servlet mappings in the target
web.xml. It's really that easy.

Make sure the .jar really contains the module descriptor (*.gwt.xml) and
that the RPC servlets are actually declared in it. If you try it with a module
that used to be an application and only declared its RPC servlets directly in
its web.xml you won't be able to use them via "gwt:mergewebxml" AFAIK.

Check the contents of the .jar file. Does it contain the module
descriptor? Does the module descriptor contain <servlet> tags for the RPCs?

2010/12/22 Metronome / Basic <[email protected]>

In fact I simply want to be able to use a jar containing GWT-RPC code
in any webapp

As I had no succes with my code

I tried to rely on "maven-googlewebtoolkit2-sample"
that is a HelloWorld RPC example with code in different modules.

here is the parent pom

I did'nt change the code , I just modified the poms

----- Original Message -----
From: Andreas Horst
To: [email protected]
Sent: Wednesday, December 22, 2010 1:52 PM
Subject: Re: Modular rpc blues

I just took a look at your configuration files.

Actually I can't tell much from just them especially since I don't
have the parent POM. Anyway I'm a bit confused about what you are trying to do.

Are you only trying to compile the sample project or are you trying
to reuse something of it? What exactly do you mean with "project war rpc and
server" or "war server"? A project that packages to a .war file (like GWT
applications) or a .war file you are trying to include via module inheritance?
I'm sorry but it's really not clear to me.

2010/12/22 Metronome / Basic <[email protected]>

Hello
Thanks for trying to help me !

One of my tries is : compile the "maven-googlewebtoolkit2-sample"
using gwt-maven-plugin
it was a three modules project war rpc and server
I reduced it to war server , by merging rpc and server

I join the pom and web.xml of the war

mvn package report

ERROR] Failed to execute goal
org.codehaus.mojo:gwt-maven-plugin:2.1.0-1:mergewebxml (default) on
project
maven-googlewebtoolkit2-sample-war: Unable to merge web..xml:
NullPointerException -> [Help 1]

----- Original Message -----
From: Andreas Horst
To: [email protected]
Sent: Wednesday, December 22, 2010 12:26 AM
Subject: Re: Modular rpc blues

Another question just coming to my mind:

Where in the inherited module are you declaring the RPC servlet?

If you declare it in the inherited module's web.xml then make
sure the Maven GWT plugin parameter "webXml" properly points to it (Not sure
how one would do this - never did it myself - especially since inherited
modules usually come as a .jar. If so does yours include the web.xml?).

If you declare it in the inherited module's module descriptor
(a..k.a. *.gwt.xml) all should be fine. Hence I assume you do not declare it
there? Look here for details about the module descriptor, note the <servlet>
tag.

My 2cents: Use the second option.

Why? Because obviously your inherited module realizes
functionality that is to be reused. It is hence some sort of library and not
(only?) an application or even a .war packed web application. All our inherited
modules are _library_ modules, they don't get deployed on an _application_
server on their own. Now if one of those features functionality through RPC (we
have some of those) we thankfully use the above mentioned <servlet> tag in the
module descriptor and let the Maven GWT plugin do its job. IMHO on the one hand
a web.xml does not belong into a common not "runnable" module and on the other
one a (.war packed) application is not best suitable for inheriting
functionality.

Regards

2010/12/21 Andreas Horst <[email protected]>

2010/12/21 Thomas Broyer <[email protected]>

On Tuesday, December 21, 2010 9:51:38 AM UTC+1, coelho wrote:
Hello

What seems to me great in GWT is that it's easy to build
client code and server code that can communicate
through GWT-RPC.

What 's great too is that you can write modules
and your webapp can use those modules.

Then why is it so complicated ( is it possible ? ) to have
a module with GWT-RPC code
( implementation and interfaces )
that could be used in a webapp

And by "so complicated" you mean adding half a dozen lines to
your web.xml file, right?

Actually the goal gwt:mergewebxml is really ALL you need
(believe me, we use it just like that for exactly what you are trying to).
Please clarify what you mean with "web.xml refers to external module". I assume
either your web.xml gets or already is troubled or your POM is not configured
properly.

I tried many things in eclipse
I tried many things with maven
( gwt-maven-plugin : goal mergewebxml ) fails when
web.xml refers to external module

still no success !

Have a look at the cargo maven plugin (I haven't tried it
though)

I wondered if there is such a project already done

Is there somewhere a jar , ready made , with GWT-RPC
included that I could use as a reference ?

or is hopeless ?

I believe that's what web-fragments in Servlets 3.0 are meant
to solve:

http://java.sun.com/developer/technicalArticles/JavaEE/JavaEE6Overview_Part2.html#webfrags

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Re: Modular rpc blues

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