Build Via the Ant Targets, maven will automatically download and install libraries from web and modbus4j-maven-local repository included in project. modbus4J.jar requires: (See pom.xml) A discussion forum for this package can be found at http://mango.serotoninsoftware.com/forum/forums/show/11.page. There is a public maven repository for downloading Modbus4J as a dependency in your project. Just add this: true ignore false modbus-data-source Modbus Dependencies https://maven.mangoautomation.net/repository/ias-release/ Use this as the dependency info: com.infiniteautomation modbus4j 3.0.3