Thanks for all help so far Lasantha!
However, I have not been able to get my test case work yet. More questions:
OK, I understand the concept of writing EJBs and then tell the EJB
container about how to run the EJBs by providing that kind of information
in XML-files specifying names, URL-access-paths and other stuff. In that
way one single application can run in many different EJB containers (or
applications servers) just by modifying the XML-files not the program code.
In your example here you have changed the servlet code to include imports
of the home and remote interface:
import com.test.ejb.MyTest;
import com.test.ejb.MyTestHome;
They appears as part of the com.test.ejb package. Note, I never put my EJB
nor the interfaces in a package. Is the package necessary?
You never wrote the content of the application.xml file. What should the
contents of the
applications.xml file be?
What is correct, to have one web.xml or one geronimo-web.xml or both?
What's the difference between web.xml and geronimo-web.xml? What is correct
about application.xml and geronimo-application.xml
In the servlet I use
Object objref = initial.lookup("java:comp/env/ejb/MyTest");
I guess that "java:comp/env/ejb/MyTest" is some sort of URL that the
container will use to return the right object (in this case an interface).
Now, what are the rules of the lookup-string? In a normal web-url eg.
http://www.freefarm.se/foo/bar/test.html the http:// part is the protocol,
<http://www.freefarm.se/>www.freefarm.se is the domain, foo/bar corresponds
to directories and test.html is the file to ret rive and show in the users
browser. But what is "java:" in java:comp/env/ejb/MyTest?? What is
env/ejb?? Is that supposed to correspond to something we have put in one of
the different xml files? Or is it part of the package com.test.ejb ? MyTest
is probably the name of the remote interface. But why the name of the
remote interface, why not the name of the home interface? Or is MyTest
refering to somwthing in the XML-files?
Now I am going to have a look at
<http://cwiki.apache.org/GMOxDOC11/deployment-plans-level-1.html>http://cwiki.apache.org/GMOxDOC11/deployment-plans-level-1.html
and see if that can put me on the right track. But I am looking forward to
your response Lasantha!
Best regards // Mattias
At 09:06 2006-09-13, you wrote:
Hi Mattias,
Following are my comments regarding this sample. I think step 1 to 3 you
might have already done. Anyway I am going to put it to clarity.
1. web.xml
You need to add ejb-ref element to the given web.xml as given in below.
Missing geronimo-web.xml in will give a warning. But anyway it will work. :)
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";
version="2.4">
<servlet>
<display-name>MyTestServlet</display-name>
<servlet-name>MyTestServlet</servlet-name>
<servlet-class>MyTestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyTestServlet</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
<ejb-ref>
<ejb-ref-name>ejb/MyTest</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>MyTestHome</home>
<remote>MyTest</remote>
<ejb-link>MyTestBean</ejb-link>
</ejb-ref>
</web-app>
2. Can't find openejb-jar.xml and ejb-jar.xml in your document.
I can't find the openejb-jar.xml and ejb-jar.xml for the ejb.jar file. It
would be some thing like this given in the below.
openejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<openejb-jar xmlns="http://www.openejb.org/xml/ns/openejb-jar-2.1";>
<dep:environment xmlns:dep="http://geronimo.apache.org/xml/ns/deployment-1.1";>
<dep:moduleId>
<dep:groupId>samples</dep:groupId>
<dep:artifactId>my-test-ejb</dep:artifactId>
<dep:version>1.0</dep:version>
<dep:type>car</dep:type>
</dep:moduleId>
<dep:dependencies/>
<dep:hidden-classes/>
<dep:non-overridable-classes/>
</dep:environment>
<enterprise-beans>
<session>
<ejb-name>MyTestBean</ejb-name>
<jndi-name>MyTestBean</jndi-name>
</session>
</enterprise-beans>
</openejb-jar>
ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd"; version="2.1">
<display-name>Generated by XDoclet</display-name>
<enterprise-beans>
<!-- Session Beans -->
<session >
<description>Test EJB </description>
<ejb-name>MyTestBean</ejb-name>
<home>MyTestHome</home>
<remote>MyTest</remote>
<ejb-class>MyTestBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
</ejb-jar>
3. Create JAR files.
Hope EJB jar file would have a package structure something similar here.
my-test-ejb.jar
|-META-INF/ openejb-jar.xml
|-META-INF/ ejb-jar.xml
|- <ejb classes>
4. Create an EAR with following structure. Note I have changed WAR archive
as my-test-web.war. ;)
my-test.ear
|- META-INF/ application.xml
my-test-web.war
my-test-ejb.jar
application.xml
5. Refer EJB from Servlet as given below. (Casting to PortableRemoteObject
is unnecessary. Anyway I am leaving it as you given)
MyTestServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.test.ejb.MyTest;
import com.test.ejb.MyTestHome;
public class MyTestServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("This is a test, time in servlet =" + new
java.util.Date().toString() + "<p>");
// Put the code here that can get the time from the EJB
// That code might look somthing like this?
try {
Context initial = new InitialContext();
Object objref = initial.lookup("java:comp/env/ejb/MyTest");
MyTestHome home = (MyTestHome)PortableRemoteObject.narrow(objref,
MyTestHome.class);
MyTest test = home.create();
String newtime = test.getTime();
out.println("This is a new test, time from EJB =" + newtime + "<p>");
} catch (Exception e) {
e.printStackTrace();
out.println("Faild to get time from EJB<p>");
}
}
}
Hope this will help.
BR,
Lasantha Ranaweera
Mattias Malmgren wrote:
Hi!
I have prepared something for you here:
http://www.freefarm.se/geronimohelp.htm
Best regards / Mattias
At 15:01 2006-09-12, you wrote:
Hi Mattias,
I would like to help you on this matter. Post your files to the community.
Regards,
Lasantha Ranaweera
Mattias Malmgren wrote:
Hello!
I have coded Java for 10 years, I know who to write Servlets and so on.
Now I would like to write som EJBs and depoy them on geronimo. I can
compile my EJBs, but the hard task is to make a ear-file and deploy. I
have looked at the Bank-exemaple in the documentation, but it is to
compex. Is there a more minimalistic example?
Best regards / Mattias
