NB Application build by maven and 'may be multiply loaded by modules'

[Kutschera Peter]

Hello out there!

I just got an 'interesting' problem when running my maven-generated NB Application.

I found a lot of information about this problem and NOT maven-based applications on the internet, but not for maven-based projects.


My problem is as follows:

There are two mvn artifacts x-api and x-impl, where x-impl depends on x-api. Both of them are outside netbeans.

Now I have a NB RCP Application with two modules:
xfilesupport (depending on x-impl)
xfileviewer (depending on x-impl)

When starting the application I get a lot of warnings for x-impl, x-api and all artefacts x-impl and x-api are depending on.

WARNUNG [org.netbeans.core.startup.NbEvents]: The extension ..x-api-1.0-SNAPSHOT.jar may be multiply loaded by modules: [...-xfilesupport.jar, ...-xfileviewer.jar]; see: http://www.netbeans.org/download/dev/javadoc/org-openide-modules/org/openide/modules/doc-files/classpath.html#class-path

It seems to me this link is non-maven specific, I am not sure if and how I can use this in information.

The interesting thing is that both, xfilesupport and xfileviewer depends on e.g. org-openide-util but there are no warnings about the org-openide-util artefact.

I tried the following:
Since xfileviewer depends on xfilesupport I removed the direct dependency to x-impl in pom.xml.
There is NO dependency to x-api in the pom.xml!
This results in
Adding on module's Class-Path:
..x-api:jar:1.0-SNAPSHOT
.. some artefacts x-api depends on ..
Private classes referenced from module: [...x_impl.SomeClassImpl]
[ERROR]Project depends on packages not accessible at runtime in module ...xfilesupport:jar:1.0-SNAPSHOT

So what can I do?
* Should I add the x-impl and x-api packages as public packages to xfilesupport?
* I already tried to move all dependencies to external artifacts in one nbm "extArtifacts" and depending on this in my other nbms, but this did not help, but maybe IU did something wrong, I am sot sure about this.
* And I don't want to put all of my code within 1 (one) nbm, but this seems to be the next thing to try on monday morning :-(


Any help will be welcome.

Thanks in advance and have a nice weekend
Peter Kutschera

[mkleint]

Kutschera Peter wrote: