Use Ant to download dependencies from Maven repositories.

build.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- ====================================================================== 

     Dependency download
     Downloads dependencies from Maven repositories.

     Maven-ant-tasks jar:
     http://www.apache.org/dyn/closer.cgi/maven/ant-tasks/2.1.3/binaries/maven-ant-tasks-2.1.3.jar

     Tasks documentation:
     http://maven.apache.org/ant-tasks/
                   
     ====================================================================== -->
<project name="MyProject"
         xmlns:mvn="antlib:org.apache.maven.artifact.ant">

  <typedef resource="org/apache/maven/artifact/ant/antlib.xml"
           uri="antlib:org.apache.maven.artifact.ant"
           classpath="lib/maven-ant-tasks-2.1.3.jar" />

  <!-- ================================= 
       target: download-deps
       ================================= -->
  <target name="download-deps"
          description="Downloads dependencies from Maven repositories.">
    <mvn:dependencies filesetId="dependency.classpath">
      <!--
        List your dependencies here. Remember to set the scope accordingly.
        -->
      <dependency groupId="org.mockejb"
              artifactId="mockejb"
              version="0.6-beta2"
              scope="compile"/>

    </mvn:dependencies>
    <copy todir="lib/">
      <fileset refid="dependency.classpath" />
    </copy>
  </target>
</project>