Sunday, July 19, 2009

UnsatisfiedLinkError with Surefire (on Mac OS X)

Wow, this was a needle in a hay stack. I recently needed to use LinkGrammar on my Mac OS X, and I wanted to use it via the Java Native Interfaces (JNI). I had been using LinkGrammar on my linux (ubuntu) boxes for some time. So, I was no stranger to compiling it with the java support. I even tested the compilation and install with:

nm /usr/local/lib/liblink-grammar-java.a | grep Java


However, when I was running maven, I received an UnsatisfiedLinkError. After MUCH googling I found:
http://www.nabble.com/Trouble-with-Java-Native-Libraries-td20293666.html

Simply setting the system property in maven for surefire is not sufficient, because maven changes the system property at runtime, which is too late for the VM to link to the library. Thus you need to use the following in your build section of your pom:

<plugin>
<groupid>org.apache.maven.plugins</groupid>
<artifactid>maven-surefire-plugin</artifactid>
<configuration>
<forkmode>once</forkmode>
<workingdirectory>target</workingdirectory>
<argline>-Djava.library.path=/usr/local/lib</argline>
</configuration>
</plugin>


After that, the VM will link to your libraries and surefire and all dependent tests should be able to see the java interfaces and access the necessary libraries.

3 comments: