how to reference native DLL from Maven repo?

Question

If a JAR is accompanied with a native DLL in Maven repo what do I need to put into my pom.xml to get that DLL into the packaging?

To be more specific take for example Jacob library. How do you make jacob-1.14.3-x64.dll go into the WEB-INF/lib folder after you run mvn package?

In our local Nexus repository we've got these definitions for JAR and DLL:

<dependency>
  <groupId>net.sf.jacob-project</groupId>
  <artifactId>jacob</artifactId>
  <version>1.16-M2</version>
</dependency>

<dependency>
  <groupId>net.sf.jacob-project</groupId>
  <artifactId>jacob</artifactId>
  <version>1.16-M2</version>
  <classifier>x64</classifier>
  <type>dll</type>
</dependency>

But putting the same dependencies to our project POM and running mvn package doesn't make DLL go to WEB-INF/lib, but JAR gets there fine.

What are we doing wrong?

PS I know that jacob 1.14 is outdated -- it's just for example — Oleg Mikheev, Jan 15 '12 at 21:59
Does [this](http://stackoverflow.com/questions/1001774/managing-dll-dependencies-with-maven) not answer the question? — eis, Jan 15 '12 at 23:07
How is the DLL stored in your repository? Does it use a classifier of DLL with packaging of POM? — Monty0018, Jan 16 '12 at 03:08
@eis unfortunately not - they decided to _remove the need for the DLL_ :) — Oleg Mikheev, Jan 16 '12 at 09:15
@eis also, that question is about loading DLL into the repository, and I'm asking how to make that DLL go from the repository to the built project package (WAR for instance) — Oleg Mikheev, Jan 16 '12 at 09:40

score 7 · Answer 1 · answered Oct 14 '13 at 14:51

Thanks to the hint from Monty0018 I was able to solve the problem. The maven code that works for me:

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-dependency-plugin</artifactId>
      <executions>
        <execution>
          <id>copy-dependencies</id>
          <phase>prepare-package</phase>
          <goals>
            <goal>copy-dependencies</goal>
          </goals>
          <configuration>
            <excludeTransitive>true</excludeTransitive>
            <includeArtifactIds>jacob</includeArtifactIds>
            <failOnMissingClassifierArtifact>true</failOnMissingClassifierArtifact>
            <silent>false</silent>
            <outputDirectory>target/APPNAME/WEB-INF/lib</outputDirectory>
            <overWriteReleases>true</overWriteReleases>
            <overWriteSnapshots>true</overWriteSnapshots>
            <overWriteIfNewer>true</overWriteIfNewer>
          </configuration>
        </execution>
      </executions>
    </plugin>
  </plugins>
 </build>

Can you tell me one thing: How does it work your solution ? Must you modify path of libararies during starting ? Must you do something else thatn modyfiying pom.xml ? — , Mar 09 '17 at 18:01

Monty0018 · Accepted Answer · 2012-01-17T05:12:49.277

6

For a DLL, you will need to use the Copy Dependencies MOJO.

You can filter out all dependencies other than the DLL and specify anywhere in your project structure to copy them to, including your target/webapp/WEB-INF/lib.

edited Jan 17 '12 at 05:12

answered Jan 17 '12 at 04:52

Monty0018

193
11

Great, thanks! Putting this mojo into `prepare-package` phase did the trick! – Oleg Mikheev Jan 17 '12 at 09:11
1

the other answer has the code, sorry I didn't notice that comment at that time – Oleg Mikheev Feb 12 '15 at 07:27

how to reference native DLL from Maven repo?

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