List of dependency jar files in Maven

Question

Using Maven 2, is there a way I can list out the jar dependencies as just the file names?

mvn dependency:build-classpath 

can list the jar files, but that will include the full path to their location in my local repository. What I need is essentially just a list of the file names (or the file names that the copy-dependencies goal copied).

So the list I need would be something like

activation-1.1.jar,antlr-2.7.6.jar,aopalliance-1.0.jar etc...

ideally as a maven property, but I guess, a file such as build-classpath can generate will do.

What I am trying to achieve is writing a Bundle-ClassPath to an otherwise manually maintained MANIFEST.MF file for a OSGi bundle. (You shouldn't need to understand this bit to answer the question.)

To clarify: The question is not about how to write manifest headers into the MANIFEST.MF file in a jar (that is easily googleble). I am asking about how to get the data I want to write, namely the list shown above.

Answer 1

Maven can build the classpath in your manifest automatically: http://maven.apache.org/guides/mini/guide-manifest.html

It's a configuration of the Maven archive plugin.

Answer 2

Here's the command you're asking for

$ mvn dependency:tree

For large projects it can output a lot of text. I assume that you want to check that dependency tree contains a certain dependency, so you don't need a full list.

Here's how you can filter output on Windows:

$ mvn dependency:tree | findstr javax.persistence

And here's how you can do it on Linux:

$ mvn dependency:tree | grep javax.persistence

Maven way to filter the dependency tree (works in Windows cmd, MacOS and Linux shell):

$ mvn dependency:tree -Dincludes=javax.persistence:*

Maven way (Windows PowerShell):

$ mvn dependency:tree '-Dincludes=javax.persistence:*'

Answer 3

Have you looked at the Apache Felix project? It has a whole mess of plugins, including a bundle plugin that should do what you want.

Also, have you tried the <addClasspath> tag with <manifestFile>? That should have the desired effect of merging the classpath into your manifest.

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-jar-plugin</artifactId>
  ...
  <configuration>
    <archive>
      <addClasspath>true</addClasspath>
      <manifestFile>src/main/resources/META-INF/MANIFEST.MF</manifestFile>
    </archive>
  </configuration>
  ...
</plugin>

Answer 4

This command will generate the dependencies tree of your maven project:

$ mvn dependency:tree

I am sure that you will like the result :-)

Answer 5

As best as I can tell, you can't get exactly that output, with the commas and no spaces. Both via the command line and via the pom.xml file, the maven-dependency-plugin or the CLI freaks out if you specify spaces or the '' (empty string) as a substitute with either pathSeparator or fileSeparator. So, you may be forced to reach something of a compromise. You can

    mvn dependency:build-classpath -Dmdep.pathSeparator=":" -Dmdep.prefix='' -Dmdep.fileSeparator=":" -Dmdep.outputFile=classpath

However, that should get you a full list, separated by '::' instead of just ',', but it works. If you run:

    mvn dependency:build-classpath -Dmdep.pathSeparator="@REPLACEWITHCOMMA" -Dmdep.prefix='' -Dmdep.fileSeparator="@" -Dmdep.outputFile=classpath

and attach this to the generate-resources phase and filter that resource later by setting the correct property in the process-resources phase of the lifecycle, you should be able to get just the comma.

You can see the full list of options at: http://maven.apache.org/plugins/maven-dependency-plugin/build-classpath-mojo.html

Answer 6

Here is an awk script to pipe mvn dependency:list:

mvn dependency:list | awk -f mvnfmt.awk

You can | sort if you want to sort by name, or | tr '\n' ':' to format it to a classpath.

mvnfmt.awk is:

BEGIN {
    found = 0
}

/The following files have been resolved/ {
    found = 1
    next
}

/^\[INFO\] \$/ {
    print "Empty " found
    if (found != 0) found = 0
}

{
    if (!found) next
    n = split($0, a, " ")
    if (n != 2) {
        found = 0
        next
    }
    split(a[2], a, ":")
    print a[2] "-" a[4] "." a[3]
}