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I am developing a project with Errai 4 and as usual I can run "mvn gwt:run" and hot reload just works, i.e. I change models or views and I only need to refresh the browser.

Now I need that but running my Errai application on top of Tomcat 7.

The project with the Tomcat is similar to https://github.com/stbland/errai-tutorial-tomcat

The question is how to make hot reload work with Tomcat 7 when I am only making changes in the front-end using only mvn gwt:run or similar.

Step by step final solution:

Info for solve this:

• How can hot reload be enabled when running Errai on Tomcat?
• Errai 4 running on Tomcat (first answer)

Install the original project

For this example we will use the errai-tutorial

• git clone https://github.com/Tlaloc-Es/errai-tutorial.git --single-branch --branch develop
• cd errai-tutorial
• mvn install

Run on Tomcat

• git clone https://github.com/Tlaloc-Es/errai-tutorial-tomcat.git --single-branch --branch develop
• cd errai-tutorial-tomcat
• mvn tomcat7:run-war

Listening changes

• cd errai-tutorial
• mvn gwt:compile
• mvn gwt:run

Now you can open http://localhost:8080/errai-tutorial/ in your web browser

For do hot reload you will need import this class in your project:

• https://gist.github.com/ibaca/1dc87a58ee542840a5f90c5ff2931329

and call it in a shorcut of this way (SuperDevModeHelper.devModeOn()) like this:

• https://github.com/Tlaloc-Es/errai-tutorial/blob/develop/src/main/java/org/jboss/errai/demo/client/local/ContactListPage.java