Friday, October 25, 2013

BUG? GWT modules inherit: filepath vs classpath

Hi everybody,

I have the following situation

There are 3 projects. Let's call them application_project,
library_project, datatype_project.

The application_project depends on the other two. However only the
datatype_project project is supposed to be compiled to javascript. So
the there is a .gwt.xml inside the datatype_project.

Now the problem is that library_project and datatype_project have the
same package structure. So the unified tree looks like

com.company.lib.{dir1/,dir2/ from library_project, datatype/ from
datatype_project}

The gwt.xml inside datatype_project is located at com.company and has
contents
!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit
2.5.1//EN"
"http://google-web-toolkit.googlecode.com/svn/tags/2.5.1/distro-source/core/src/gwt-module.dtd">
<module>
<inherits name="com.google.gwt.user.User" />
<source path="lib"></source>
</module>

The problem is that the gwt compiler is trying to compile staff from the
library_project just because the classpath is matching
(com.company.lib). I thought that the <source path=> directive was about
files and directories and not classpath. Finally in
http://www.gwtproject.org/doc/latest/DevGuideOrganizingProjects.html#DevGuideModules
there is the following statement.

---------------------------
Source Path

Modules can specify which subpackages contain translatable /source/,
causing the named package and its subpackages to be added to the /source
path/. Only files found on the source path are candidates to be
translated into JavaScript, making it possible to mix client-side
<http://www.gwtproject.org/doc/latest/DevGuideCodingBasics.html#DevGuideClientSide>
and server-side
<http://www.gwtproject.org/doc/latest/DevGuideServerCommunication.html#DevGuideServerSide>
code together in the same classpath without conflict.
-------------------

so the behavior looks inconsistent with the documentation (bug?)

What do you think?

Vassilis Virvilis

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