Add lbj maven plugin to your maven project

  <build>
     <plugins>
       <plugin>
         <groupId>edu.illinois.cs.cogcomp</groupId>
         <artifactId>lbjava-maven-plugin</artifactId>
         <version>2.0</version>
         <configuration>
           <dFlag>lbjava/class/output/</dFlag>
           <gspFlag>path/to/intended/lbjavasrc/output</gspFlag>
           <sourcepathFlag>path/to/src</sourcepathFlag>
           <lbjavaInputFileList>
            <param>path/to/lbjavafile.lbj</param>
            <param>path/to/second/lbjavafile2.lbj</param>
            <param>etc/etc.lbj</param>
           </lbjavaInputFileList>
         </configuration>
       </plugin>
     </plugins>
  </build>