# qooxdoo

## the new era of web development

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# Java RPC

Note

This information refers to releases up to 0.7.x. It needs to be updated for the current releases 1.4.

## Building a qooxdoo test application

The Java backend comes with a `build.xml` file that generates a web application archive (WAR). (In order to use this build file, you need to have Ant installed.) The resulting WAR contains all the necessary server-side and client-side classes to experiment with the RPC mechanism.

To build the test WAR, simply follow these steps on the command line:

    cd /qooxdoo/frontend
    make build
    cd /qooxdoo/backend/java
    ant

Now deploy the WAR in a Java web server of your choice (e.g. Apache Tomcat). You can then point your browser to one of the RPC test pages (e.g. `http://localhost:8080/qooxdoo/sample/html/test/RPC_1.html`) to see the RPC mechanism in action.

Future qooxdoo releases may also include a pre-built Java backend.

## Building your own applications

You can use the supplied `build.xml` as a starting point for your own applications. For example, you can modify it to include your own applications instead of the qooxdoo examples. Or you can modify it to build a JAR with the qooxdoo RPC classes and add that to an already existing webapp of yours. In this case, you have to add a mapping for the RpcServlet in your web.xml (see `webapp/WEB-INF/web.xml` in the Java backend).

For development, you can use cross-domain calls (see below). This way, you can load HTML and script files via `file://` URLs, and only the server part needs to be packaged in a WAR. To see any client-side changes, simply reload the page. When you're ready to put the application into production, set cross-domain to false and add the client part to the WAR. There are also more sophisticated solutions (e.g. using a servlet and a custom classloader to load scripts), but these are beyond the scope of this article.