Example of cross-GWT application communication running cd ./plugincommon mvn clean install cd ./pluginserver mvn clean install cd ./plugin mvn clean install deploy ./plugin/target/plugin-0.0.1-SNAPSHOT.war deploy ./pluginserver/target/server-0.0.1-SNAPSHOT.war browse to http://localhost:8080/server-0.0.1-SNAPSHOT/ (or whatever port your web-server is configured to use)