Hi Mattaias,
Please read my in line comments.
Regards,
Lasantha Ranaweera
Mattias Malmgren wrote:
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?
Not at all. Actually I have tested your classes creating a simple
project. So I created those packages for my work. You can test your
sample application without putting it in to a package. :-)
You never wrote the content of the application.xml file. What should
the contents of the
applications.xml file be?
Well... it is another mistake. Please use given context for the
application.xml.
<?xml version="1.0" encoding="UTF-8"?>
<application
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/application_1_4.xsd";
version="1.4">
<module>
<ejb>my-test-ejb.jar</ejb>
</module>
<module>
<web>
<web-uri>my-test-web.war</web-uri>
<context-root>/Test</context-root>
</web>
</module>
</application>
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
Having web.xml only for your web application is enough. But when you are
developing a commercial application I am sure it is not going to be
enough. So I would recommend you to get familiar with geronimo-*.xml
files too. If you need to take Geronimo application specific
information, only you have to use geronimo-*.xml files.
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
Yes it looks this is more simpler sample than the one I have given to
you :-) .
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
