The use of Raspberry PI on automation is a well-recognized and economic option to develop control tasks. Pi is a single-board computer with a powerful CPU that can combined with hundreds of expansion boards that make this hardware ideal to resolve automation problems from simple light control to complex bioreactors. Sometimes is difficult to find open source projects for Raspberry Pi in Java. We show the use of a combination of several open source java projects to resolve embedded applications for automation purposes, using Apache Tomcat as web server, Vaadin as web application framework and Pi4j project for interoperation with GPIO of Raspberry PI. Putting together these projects we can build applications for interoperate with real world through embedded web applications to resolve complex automation tasks. We can use this combination for home automation, weather monitor, bioreactors control and much more.