The JavaScript functions generated corresponding
to Java class methods have a callback function as one of the parameters.
The remote methods are invoked in the browser using a callback function
and the request is sent to the server using Ajax. When the request is
complete a response is returned to the browser using Ajax. The callback
function specified in the remote method gets invoked with the data
returned from the server and the web page may be updated with the server
response.
5.2 Setting the Environment
Download the DWR1 1.1.4 JAR file dwr.jar. DWR is supported on most
browsers. We shall be using Internet Explorer 6. DWR requires JDK 1.3 or
later and a servlet container that support servlet specification 2.2 or later.
Install a JDK if not already installed. JDK 1.5.0_13 was used in this
chapter. DWR has been tested on the following web servers: Tomcat,
WebLogic, WebSphere, JBoss, Jetty, Resin, Sun ONE, and Glassfish. We
1 Download DWR-http://getahead.org/dwr
90 5 Ajax with Java-DWR
shall be using JBoss 4.x2; install JBoss 4.x if not already installed. We
shall be using MySQL3 database as the database for the DWR application,
therefore, install MySQL 5.0. Create a database table UserTable in the
MySQL database using the following script.
CREATE TABLE UserTable(userid VARCHAR(25)
PRIMARY KEY, password VARCHAR(25));
INSERT INTO UserTable VALUES('dvohra', 'ajaxdwr');
INSERT INTO UserTable VALUES('jsmith', 'smith');
Next, configure JBoss with MySQL.
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