JBoss 4.0 automatically integrates Tomcat 5.0, so it's not just a professional EJB container, but also a professional Jsp/servlet container and Web server.
TOMCAT 5.0 is integrated in the following directory of JBoss:
Jboss_home\server\default\deploy\jbossweb-tomcat50.sar
It provides a server.xml and Web.xml file that allows you to make some basic settings for Tomcat. But JBoss's designers recommend that users not even touch the directory, let alone modify and add any files, because Tomcat is so tightly connected that all setup work can be done in JBoss's own configuration file. But I still found a place worth modifying: Change the port number in the Server.xml, for example, from the default 8080 port to 4000 port, because I found that my "Baidu down Bar" software often takes up 8080 ports, and I already have a Tomcat 5.0.
Type this:
http://localhost:4000/
Access to JBoss's Welcome page is available
This article demonstrates how a JSP page invokes an EJB component in JBoss 4.0.
General structure:
Java application/
|__EJB components/(Haiejb.jar)
| |__meta-inf/
| | | |__ejb-jar.xml
| | | |__jboss.xml
| |__ejbs/
| |__haihome.class
| |__haiclient.class
| |__haibean.class
|__web application/(Haiejb.war)
| |__haiejb.jsp
| |__web-inf/
| |__web.xml
| |__jboss-web.xml
|__meta-inf/
|__application.xml
I. Compiling java files as EJB class files
Java File compilation:
[Assuming that the javax.ejb.* package is included in the classpath of the system environment variable, the package can be found in the following places:
Jboss_home\server\default\lib\jboss-j2ee.jar
Jboss_home\client\jboss-j2ee.jar]
[Java source file directory]>:javac-classpath%classpath%-d [Output directory: EJB component Directory] *.java
Haihome.java:
Package EJBS;
Import java.io.Serializable;
Import java.rmi.*;
Import javax.ejb.*;
Public interface Haihome extends EJBHome {
Haiclient Create () throws RemoteException, createexception;
}
Haiclient.java:
Package EJBS;
Import javax.ejb.*;
Import java.rmi.RemoteException;
Public interface Haiclient extends Ejbobject {
Public String Sayhai () throws remoteexception;
}
Haibean.java:
Package EJBS;
Import javax.ejb.*;
Import javax.naming.*;
public class Haibean implements Sessionbean {
Public String Sayhai () {
Return "Hai, EJB technology!";
}
public void Ejbcreate () throws Ejbexception {}
public void Ejbremove () throws Ejbexception {}
public void Ejbpassivate () {}
public void Ejbactivate () {}
public void Setsessioncontext (Sessioncontext sc) {}
}
Second, create EJB components:
Haiejb.jar: (EJB component)
Packaging commands: [EJB component directory]>:jar CVF Haiejb.jar meta-inf/ejbs/
|__meta-inf/
| |__ejb-jar.xml
| |__jboss.xml
|__ejbs/
|__haihome.class
|__haiclient.class
|__haibean.class
Ejb-jar.xml:
! DOCTYPE Ejb-jar Public '-//sun Microsystems, Inc.//dtd Enterprise, JavaBeans 2.0//en ' http://java.sun.com/dtd/ejb-jar_2 _0.dtd ' >
Hai EJB instance.
Hai EJB
HAIEJB
EJBs. Haihome
EJBs. Haiclient
EJBs. Haibean
Stateless
Bean
Jboss.xml:
HAIEJB
HAIEJB
third, create Web applications
Haiejb.war: (Web application)
Packaging commands: [WEB application directory]>:jar CVF haiejb.war haiejb.jsp web-inf/
|__haiejb.jsp
|__web-inf/
|__web.xml
|__jboss-web.xml
HAIEJB.JSP:
<%@ page contenttype= "TEXT/HTML;CHARSET=GBK"%>
<%@ page import= "Ejbs.*,javax.ejb.*,javax.naming.*,javax.rmi.portableremoteobject,java.rmi.remoteexception"%>
<% String message = "nothing!";
try {
InitialContext IC = new InitialContext ();
Object ObjRef = Ic.lookup ("HAIEJB");
Haihome home = (haihome) portableremoteobject.narrow (OBJREF,EJBS. Haihome.class);
Haiclient hairemote = Home.create ();
message = Hairemote.sayhai ();
catch (RemoteException re) {
Re.printstacktrace ();
catch (createexception CE) {
Ce.printstacktrace ();
catch (Namingexception ne) {
Ne.printstacktrace ();
}
%>
<%=message%>
Xml:
! DOCTYPE Web-app Public '-//sun Microsystems, INC.//DTD Web Application 2.3//en ' ' Http://java.sun.com/dtd/web-app_2_3.dtd '
HAIEJB
Session
EJBs. Haihome
EJBs. Haiclient
Jboss-web.xml:
HAIEJB
HAIEJB
Four, create the Java EE application
Haiejb.ear: (Java EE application)
Copy the Haiejb.jar and Haiejb.war packages you created above to the Java EE Application Home directory you created, create a new Meta-inf directory and make application.xml files inside:
Packaging commands: [Java application directory]>:jar CVF haiejb.ear haiejb.jar Haiejb.war meta-inf/
|__haiejb.jar
|__haiejb.war
|__meta-inf/
|__application.xml
Application.xml:
HAIEJB Java Application
Haiejb.war
/HAIEJB
Haiejb.jar
v. Deployment of Java application:
Copy the Haiejb.ear to the jboss_home\server\default\deploy\.
Start JBoss 4.0, notice if there are any exceptions in the Command Line window, and check the log file if there are any exceptions:
Jboss_home\server\default\log\server.log
Find out where to analyze the problem, and then correct it until no exceptions appear
Finally, in the browser address bar, type:
http://localhost:8080/haiejb/haiejb.jsp
Results:
Hai, EJB technology!
Good luck!
