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UPDATE For GWT 2.6+:
You will need to reference a few more jars in your project in order for jetty to work:

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You will also need to place a "jetty-web.xml" file in your WEB-INF directory.  The contents of this file will be used to create the pool in jetty.
The file contents are given below: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd"> <Configure class="org.eclipse.jetty.webapp.WebAppContext"> <New id="website" class="org.eclipse.jetty.plus.jndi.Resource"> <Arg></Arg> <Arg>java:comp/env/jdbc/poolname</Arg> <Arg> <New class="com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource"> <Set name="Url">jdbc:mysql://hostname:3306/dbname</Set> <Set name="User">username</Set> <Set name="Password">password</Set> </New> </Arg> </New> </Configure>
There is one last thing to setup, and that is your Run/Debug configuration. In the VM arguments you will need to add:
-Djava.naming.factory.initial=org.eclipse.jetty.jndi.InitialContextFactory For GWT 2.5:

If you plan on running your GWT application on tomcat, you setup your datasource in the usual way. Normally you use a connection pool, which you setup in META-INF/context.xml

By default, GWT uses jetty when you are running your application in hosted mode.  In order to use the same code to access the database, you must configure a few things in your project.

You will need to reference a few more jars in your project in order for jetty to work:

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[Image]You will also need to place a "jetty-web.xml" file in your WEB-INF directory.  The contents of this file will be used to create the pool in jetty. The file contents are given below: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://jetty.mortbay.org/configure.dtd"> <Configure class="org.mortbay.jetty.webapp.WebAppContext"> <New id="website" class="org.mortbay.jetty.plus.naming.Resource"> <Arg>java:comp/env/jdbc/poolname</Arg> <Arg> <New class="com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource"> <Set name="Url">jdbc:mysql://hostname:3306/dbname</Set> <Set name="User">username</Set> <Set name="Password">password</Set> </New> </Arg> </New> </Configure> There is one last thing to setup, and that is your Run/Debug configuration. In the VM arguments you will need to add:
-Djava.naming.factory.initial=org.mortbay.naming.InitialContextFactory as shown below:

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