env-entry tag

[aakash bhatt]

What is the use of env-entry tag in deployment descriptor. Can i have an example

Thanks,
aakash

[Jason Hunt]

with env-entry tag, the bean providers don't need to hard code some value in their bean code. for example if they want to get the tax rate of current year, they can creat a env-entry in the DD and in the bean code, they just do a jndi lookup to get the value.

[aakash bhatt]

Hi Jason,

Thanks for the reply.
Could you pl elaborate more, or give a code example on this.

Thanks,
aakash

[Ryan P. Kane]

Here's an example from an assignment I had to do for class last week. I used the env-entry to provide JDBC info, so I didn't have to hard code it.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC 
          "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" 
          "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
 
<ejb-jar>
    <enterprise-beans>
        <session>
            <ejb-name>RegistrationStatus</ejb-name>
            <home>kanerp.StatusHome</home>
            <remote>kanerp.Status</remote>
            <local-home>kanerp.StatusLocalHome</local-home>
            <local>kanerp.StatusLocal</local>
            <ejb-class>kanerp.StatusEJB</ejb-class>
            <session-type>Stateless</session-type>
            <transaction-type>Container</transaction-type>
            <env-entry>
        <env-entry-name>jdbcDriver</env-entry-name>
  <env-entry-type>java.lang.String </env-entry-type>
  <env-entry-value>COM.cloudscape.core.JDBCDriver</env-entry-value>
            </env-entry>
            <env-entry>
        <env-entry-name>jdbcUrl</env-entry-name>
  <env-entry-type>java.lang.String</env-entry-type>
  <env-entry-value>jdbc:cloudscape:C:\cloudscape364\databases\JHU</env-entry-value>
            </env-entry>
            <env-entry>
        <env-entry-name>jdbcUsername</env-entry-name>
  <env-entry-type>java.lang.String</env-entry-type>
  <env-entry-value>cloudscape</env-entry-value>
            </env-entry>
            <env-entry>
        <env-entry-name>jdbcPassword</env-entry-name>
  <env-entry-type>java.lang.String</env-entry-type>
  <env-entry-value>cloudscape</env-entry-value>
            </env-entry>
        </session>
    </enterprise-beans>
    <assembly-descriptor>
        <container-transaction>
            <method>
                <ejb-name>RegistrationStatus</ejb-name>
                <method-name>*</method-name>
            </method>
            <trans-attribute>Supports</trans-attribute>
        </container-transaction>
    </assembly-descriptor>
</ejb-jar>

In my java code, I did the following:

    private void setDatabaseInformation() throws NamingException {
            Context initCtx = new InitialContext();
            
            jdbcDriver   = (String) initCtx.lookup("java:/comp/env/jdbcDriver");
            jdbcUrl      = (String) initCtx.lookup("java:/comp/env/jdbcUrl");
            jdbcUsername = (String) initCtx.lookup("java:/comp/env/jdbcUsername");
            jdbcPassword = (String) initCtx.lookup("java:/comp/env/jdbcPassword");
            
            JNDIUtilities.close(initCtx);
    }

Hope that helps,
Ryan
[ August 05, 2004: Message edited by: Ryan P. Kane ]