Hey folks, I've run into a problem (otherwise I wouldn't be posting here, eh). I am using the HashCodeBuilder of http://commons.apache.org/lang/. I am referencing it as library which I am including my plugin, but as soon as I am trying to run the plugin, I am getting the ClassNotFoundException Code:java java.lang.ClassNotFoundException: org.apache.commons.lang3.builder.HashCodeBuilder as soon as I am trying to create a new instance of it Code:java new HashCodeBuilder(); (which means it is found when compiled, but not when running). I've been using google to find a solution, but none of them leaded to success yet. I tried including the class-path in my manifest file, but that didn't work either. My project structure is like this: src/ libs/ <- the commons-lang3-3.1.jar is in there, I am referencing that ... and I am exporting all of it. Any ideas? Bump. EDIT by Moderator: merged posts, please use the edit button instead of double posting.