8:10 a.m.
Phi GF [http://community.jboss.org/people/phiboss] created the discussion
"Mini (Stateful) EJB 3 Example using JBoss and Eclipse"
To view the discussion, visit: http://community.jboss.org/message/630901#630901
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Hello Community
(appologise I am new to JBoss 3.0)
I am looking for a simple EJB 3.0 Example using a Stateful Bean to demonstrate the
components and concepts of an application server. I have searched several forums and
googled a lot, but I have found mostly solutions to Problems I did not encounter. (I have
an EJB 2 Example, which is not applicable, because my trainees will work on EJB 3.0 or 3.1
later.)
Here my configuration:
*JBoss Application Server 7.0.1 final*
*OS: Linux Ubuntu 64 Bit (10.10)*
*Eclipse 64 Bit J2EE (indigo)*
*Java 1.6.0_26*
I have 2 Projects in my Eclipse Workbench (a Server + a Client). The Server contains 2
classes:
MyTimerRemote.java:
package ch.my.timer.server;
import javax.ejb.Remote;
@Remote
public interface MyTimerRemote {
void setRemainingSecs(int seconds);
float getRemainingSecs();
}
and MyTimer.java (also on the server):
package ch.my.timer.server;
import javax.ejb.Stateful;
/**
* Session Bean implementation class MyTimer
*/
@Stateful
public class MyTimer implements MyTimerRemote {
public MyTimer() {
this.endTimePoint = System.currentTimeMillis();
}
private long endTimePoint; // timestamp in milliseconds
@Override
public void setRemainingSecs(int seconds) {
long millis = seconds * 1000;
long now = System.currentTimeMillis();
this.endTimePoint = now + millis;
}
@Override
public float getRemainingSecs() {
long now = System.currentTimeMillis();
long diff = this.endTimePoint - now;
float secs = (float) (diff / 1000.0);
return secs;
}
}
The Client Project contains a simple Test class (MyTimerTest.java):
package ch.my.timer.client;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import ch.my.timer.server.*;
public class MyTimerTest {
public static void main(String[] args) {
try {
new MyTimerTest().top();
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
void top() throws NamingException {
Hashtable<String, String> env = new Hashtable<String, String>();
env.put(Context.INITIAL_CONTEXT_FACTORY,
"org.jnp.interfaces.NamingContextFactory");
env.put(Context.PROVIDER_URL, "localhost:1099");
env.put(Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces" );
InitialContext ctx = new InitialContext(env);
MyTimerRemote str = (MyTimerRemote)
ctx.lookup("java:module/SantisTimer");
str.setRemainingSecs(3);
float rem = str.getRemainingSecs();
System.out.println("Remaining: " + rem);
}
}
Starting the server (using "run on server -> JBoss 7.0 Runtime Server, i get the
following output:
15:05:06,995 INFO [org.jboss.modules] JBoss Modules version 1.0.1.GA
15:05:07,394 INFO [org.jboss.msc] JBoss MSC version 1.0.0.GA
...
15:05:11,026 INFO [org.jboss.as.server.deployment] (MSC service thread 1-2) Starting
deployment of "EJB_Servenull"
15:05:11,146 INFO [org.jboss.as.jpa] (MSC service thread 1-1) added javax.persistence.api
dependency to EJB_Servenull
15:05:11,237 INFO
[org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC
service thread 1-4) JNDI bindings for session bean named MyTimer in deployment unit
deployment "EJB_Servenull" are as follows:
java:global/EJB_Servenull/MyTimer!ch.my.timer.server.MyTimerRemote
java:app/EJB_Servenull/MyTimer!ch.my.timer.server.MyTimerRemote
java:module/MyTimer!ch.my.timer.server.MyTimerRemote
java:global/EJB_Servenull/MyTimer
java:app/EJB_Servenull/MyTimer
java:module/MyTimer
15:05:11,434 INFO [org.jboss.as.server.controller] (DeploymentScanner-threads - 2)
Deployed "EJB_Servenull"
Starting the client (run as Java Application) I get:
javax.naming.CommunicationException: Receive timed out [Root exception is
java.net.SocketTimeoutException: Receive timed out]
at org.jnp.interfaces.NamingContext.discoverServer(NamingContext.java:1302)
at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:1382)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:579)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:572)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at ch.my.timer.client.MyTimerTest.top(MyTimerTest.java:28)
at ch.my.timer.client.MyTimerTest.main(MyTimerTest.java:14)
Caused by: java.net.SocketTimeoutException: Receive timed out
at java.net.PlainDatagramSocketImpl.receive0(Native Method)
at java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:145)
at java.net.DatagramSocket.receive(DatagramSocket.java:725)
at org.jnp.interfaces.NamingContext.discoverServer(NamingContext.java:1272)
... 6 more
Any Ideas? What am I missing?
Thanks in advance.
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