...
For example, the following web.xml and geronimo-web.xml are the deployment descriptor and Geronimo deployment plan respectively, of a web application that connects to a datasource deployed on DB2 and retrieves data from a table.
| Code Block | ||||||||
|---|---|---|---|---|---|---|---|---|
| ||||||||
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<resource-ref>
<res-ref-name>jdbc/DataSource</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
<welcome-file-list>
<welcome-file>jsp/EMPdemo.jsp</welcome-file>
</welcome-file-list>
</web-app>
|
...
In geronimo-web.xml, a <dependency> element is added to make the the resource archive (RAR) visible to your application, and then a mapping is provided in <resource-ref>.
| Code Block | ||||||||
|---|---|---|---|---|---|---|---|---|
| ||||||||
<web-app xmlns="http://geronimo.apache.org/xml/ns/j2ee/web-2.0.1"
xmlns:naming="http://geronimo.apache.org/xml/ns/naming-1.2"
xmlns:sec="http://geronimo.apache.org/xml/ns/security-2.0"
xmlns:sys="http://geronimo.apache.org/xml/ns/deployment-1.2">
<sys:environment>
<sys:moduleId>
<sys:groupId>samples</sys:groupId>
<sys:artifactId>EmployeeDemo</sys:artifactId>
<sys:version>2.5</sys:version>
<sys:type>war</sys:type>
</sys:moduleId>
<sys:dependencies>
<sys:dependency>
<sys:groupId>samples</sys:groupId>
<sys:artifactId>EmployeeDatasource</sys:artifactId>
<sys:version>2.5</sys:version>
<sys:type>rar</sys:type>
</sys:dependency>
</sys:dependencies>
</sys:environment>
<context-root>/EmployeeDemo</context-root>
<naming:resource-ref>
<naming:ref-name>jdbc/DataSource</naming:ref-name>
<naming:resource-link>jdbc/EmployeeDatasource</naming:resource-link>
</naming:resource-ref>
</web-app>
|
...
In the EMPdemo.jsp, the following java code snippet is used to obtain a connection from the datasource. It reference the resource from the java:comp/env context entries.
| Code Block | ||||||||
|---|---|---|---|---|---|---|---|---|
| ||||||||
....
....
Context initContext = new InitialContext();
Context envContext = (Context)initContext.lookup("java:comp/env");
DataSource ds = (DataSource)envContext.lookup("jdbc/DataSource");
Connection con = ds.getConnection();
....
....
|
...