Let's say you're using Eclipse IDE and your project folders structure is: 1. Ensure any errors in your project has gone: - Right click to simple-chat project and select Run As → Maven build - Select Main tab and set  Goals: clean install - Click run 2. On Eclipse, right click to project and select Run As → Maven build 3. Config project's run configurations Select Main tab and set: Goals: clean install Profiles: export run configurations: main tab setting Select Environment tab and set: EZYFOX_SERVER_HOME: to your ezyfox server path run configurations: environment tab setting 4. Click run 5. You need build all 4 projects - simple-chat-common - simple-chat-plugin - simple-chat-api - simple-chat-entry