To add a new JNDI data source resource, you must also make an entry for the resource in the context.xml file located in SYBASE\tomcat\conf. An entry in this file makes the data source you created in server.xml available to all Web applications. Here is an example for PortalDB:
<ResourceLink global="jdbc/portaldb" name="jdbc/portaldb" type="javax.sql.DataSource"/>
Instead, you could set up a data source for a particular Web application using the Web application’s ...\META-INF\context.xml file. This is described in the JNDI resource instructions.
