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The only caveat is that you need to set the class loader to the portal's class loader before you invoke the JNDI lookup.

Otherwise the JNDI lookup is exactly the same as you would do it in any other application.

Thanks David  for response.
In ext.spring file i have added below property  <bean id="bean1" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName" value="java:comp/env/jdbc/db1" />
         
    </bean>
    
     <bean id="customDBDataSource" class="org.springframework.jdbc.datasource.LazyConnectionDataSourceProxy" lazy-init="true">
    <property name="targetDataSource">
        <ref bean="bean1" />
    </property>and while starting the module i am getting below error
 Invocation of init method failed; nested except
ion is javax.naming.NoInitialContextException: Cannot instantiate class: org.apache.naming.java.javaURLContextFactory [Root exception is java.lan
g.ClassNotFoundException: Unable to load class org.apache.naming.java.javaURLContextFactory]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:562)

Ok..Thanks...I was able to get the Datasource connection through the way we get in J2EE application.
InitialContext ctx = new InitialContext();