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From Thomas Sundberg <>
Subject Re: using maven modules
Date Fri, 04 May 2012 05:21:12 GMT
On Fri, May 4, 2012 at 3:36 AM, Billy Newman <> wrote:
> A while back I had some questions about building some jars that only differ
> in the properties files stored in the jar.  I was going to use classifiers
> to differentiate the jars but was advised against it.
> My company has many, many different deployments and for these jars they
> want to keep the properties file packaged with the jars.
> I was think about maybe having a parent project that contains the java
> source (since the code is the same for each jar).  Then maybe child modules
> that have the properties files in the resources directory.  Then each child
> module can build the java code and throw in the properties file ( i dont
> really care that if I build the same byte code many time as the build is
> very fast).  This idea came to mind because I have unit tests for the jar
> files that test the code against the different properties files.  I.E. when
> I build the source and throw in the properties the unit test will run).  So
> each module will run the unit tests against its property file.
> Unfortunately my idea only really works in my head.  My problem is that the
> parent module cannot contain the java source code as the parent module
> needs to be a pom.

If I were to build something similar to what you described, I would
keep the production java source in one module that produces a jar. The
modules with the properties would then be dependent on the production
code jar module and produce the jars with the property file and
include the production jar. I would probably keep the test classes
with each property module. I assume the with different properties,
there will be different result for the tests.

All modules could reside on the same level in a multi module project
or you could have some kind of hierarchy with the property modules
separated. It really doesn't matter from a Maven perspective.

Explore the maven-assembly-plugin [1] for more inspiration on how to
include a jar within a jar. I wrote an example about how to create an
executable jar from Maven a while ago [2], it is similar in the sense
that packages all it's dependencies in the resulting jar.

Maybe this can inspire you to a new idea?

> Any one have any ideas on how I can setup my maven project hierarchy such
> that the code lives in one place and the resources live in another (maybe a
> child module).  Such that when I build I build from the same source each
> time but insert a different properties file, then test each one.
> I think they can all live in one group, but have different artifactids:
> ie. group - com.test.module
> artifacts - module-type1.jar, module-type2.jar, module-type3.jar
> Thanks in advance for any ideas.

Thomas Sundberg
M. Sc. in Computer Science

Mobile: +46 70 767 33 15
Twitter: @thomassundberg

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