Hello ! The problem of JNDI access through JSP !

[jonathan78wong]

Dear all ,
Hello ! I create and deploy a jar in JBoss-3.2.1 (without Tomcat) . I have a JSP as follow :

<%@ page
session="false"
isThreadSafe="true"
isErrorPage="false"
import="javax.naming.*, com.sample.*, javax.rmi.PortableRemoteObject, java.util.*, java.io.*, javax.net.*"
%>

<h4>test</h4>
test
<%
try {

Properties properties = new Properties();
properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
properties.put(Context.PROVIDER_URL, "127.0.0.1:1099");
properties.put(Context.URL_PKG_PREFIXES, "org.JBoss.naming:org.jnp.interfaces");

InitialContext lContext = new InitialContext(properties);
Object objref = lContext.lookup("HelloWorldRef");
HelloWorldHome lHome = (HelloWorldHome) PortableRemoteObject.narrow(objref, HelloWorldHome.class);
HelloWorld lSession = lHome.create();
String fromEJB = lSession.hello();
out.println( "" + fromEJB);
}
catch( Exception e ) {
out.println( "Caugth exception: " + e.getMessage() );
e.printStackTrace();
}

and the web.xml in :

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

<web-app>
<display-name>Welcome to EJB</display-name>
<ejb-ref>
<ejb-ref-name>HelloWorld</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
com.sample.HelloWorldHome
come.samlpe.HelloWorld
<ejb-link>HelloWorld</ejb-link>
</ejb-ref>

</web-app>

and the jboss.xml in jar :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss-web
PUBLIC "-//JBoss//DTD Web Application 2.3//EN"
"http://www.jboss.org/j2ee/dtds/jboss-web_3_0.dtd">


<enterprise-beans>

<ejb-name>HelloWorld</ejb-name>
<jndi-name>jb/HelloWorldHome</jndi-name>

</enterprise-beans>


and the ejb-jar.xml in jar :

<?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>
JBoss Hello World Application
<display-name>Hello World EJB</display-name>
<enterprise-beans>

<ejb-name>HelloWorld</ejb-name>
com.sample.HelloWorldHome
com.sample.HelloWorld
<ejb-class>com.sample.HelloWorldBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>

</enterprise-beans>
</ejb-jar>

I place the web.xml in WEB-INF and EJBs in WEB-INF\classes

However , Tomcat says :

Caugth exception: HelloWorldRef not bound

Therefore , what should I do to correct it ? Thank you !

[haraldgliebe]

Hi,

if you use an ejb-ref to reference an EJB in a web application you have to prepend "java:comp/env/" to the ejb-ref-name. Therefore your lookup should be
Object objref = lContext.lookup("java:comp/env/HelloWorldRef");
You also shouldn't give any properties to the constructor of InitialContext when accessing "java:comp/env", since this namespace is managed by the container .


Regards,
Harald

[jonathan78wong]

Dear Harald ,
Hello ! Thank you for your suggestion . I change my JSP as follow :

<%@ page
session="false"
isThreadSafe="true"
isErrorPage="false"
import="javax.naming.*, com.sample.*, javax.rmi.PortableRemoteObject, java.util.*, java.io.*, javax.net.*"
%>

<h4>test</h4>
test
<%

try {
InitialContext lContext = new InitialContext();
Object objref = lContext.lookup("java:comp/env/HelloWorldRef");
HelloWorldHome lHome = (HelloWorldHome) PortableRemoteObject.narrow(objref, HelloWorldHome.class);
HelloWorld lSession = lHome.create();
String fromEJB = lSession.hello();
out.println( "" + fromEJB);
}
catch( Exception e ) {
out.println( "Caugth exception: " + e.getMessage() );
e.printStackTrace();
}
%>

And the jboss.xml in jar :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss-web
PUBLIC "-//JBoss//DTD Web Application 2.3//EN"
"http://www.jboss.org/j2ee/dtds/jboss-web_3_0.dtd">


<enterprise-beans>

<ejb-name>HelloWorld</ejb-name>
<jndi-name>HelloWorld</jndi-name>

</enterprise-beans>


And ejb-jar.xml in jar :

<?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>
JBoss Hello World Application
<display-name>Hello World EJB</display-name>
<enterprise-beans>

<ejb-name>HelloWorld</ejb-name>
com.sample.HelloWorldHome
com.sample.HelloWorld
<ejb-class>com.sample.HelloWorldBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>

</enterprise-beans>
</ejb-jar>

And web.xml in WEB-INF :

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

<web-app>
<display-name>Welcome to EJB</display-name>
<ejb-ref>
<ejb-ref-name>HelloWorldRef</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
com.sample.HelloWorldHome
come.samlpe.HelloWorld
<ejb-link>HelloWorld</ejb-link>
</ejb-ref>

</web-app>

I redeployed the jar in JBoss-3.2.1 (without Tomcat) . However , the Tomcat says :

Caugth exception: Name HelloWorld is not bound in this Context

Therefore , what futher should I have . Thank you !

[haraldgliebe]

Oh, I didn't notice that you deploy your webapp on a standalone Tomcat. In that case it doesn't work with the ejb-name, since Tomcat can't see from the name of the ejb where it is deployed. I don't know if and how you could pass this information to tomcat.

But you can lookup the bean directly from the jboss jndi. To do that specify the jndi.properties as in your first post to get an InitialContext for the jndi tree of jboss and then lookup the EJB with the name specified in the jboss.xml:


Properties properties = new Properties();
properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
properties.put(Context.PROVIDER_URL, "127.0.0.1:1099");
properties.put(Context.URL_PKG_PREFIXES, "org.JBoss.naming:org.jnp.interfaces");

InitialContext lContext = new InitialContext(properties);
Object objref = lContext.lookup("jb/HelloWorldHome");

Regards,
Harald