Context - Resources

<Context>

<Resource name="jdbc/postgres" auth="Container"

Type="javax.sql.DataSource" driverClassName="org.postgresql.Driver".

Url="jdbc:postgresql://127.0.0.1:5432/mydb".

Username="myuser" password="mypasswd" maxActive="20" maxIdle="10".

MaxWait="-1"/>.

</Context>

1. web.xml configuration.

<resource-ref>

<description>postgreSQL Datasource example</description>

<description>postgreSQL <res-ref-name>jdbc/postgres</res-ref-name>

<res-ref-name>jdbc/postgres</res-ref-name> <res-type>javax.sql.DataSource</res-type>

<res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth>

<resource-ref> </resource-ref>

________________.

InitialContext cxt = new InitialContext();.

if ( cxt == null ) {

Throw new Exception("Uh oh -- no context!");.

}.

DataSource ds = (DataSource) cxt.lookup( "java:/comp/env/jdbc/postgres" );.

if ( ds == null ) {

Throw new Exception("Data source not found!");.

}.