[EJB3] - Singleton in clustered JBoss AS 6 Final
by Dan Osterrath
Dan Osterrath [http://community.jboss.org/people/DanOsterrath] created the discussion
"Singleton in clustered JBoss AS 6 Final"
To view the discussion, visit: http://community.jboss.org/message/583084#583084
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Hello to everyone,
I have a singleton session bean that handles some nightly database cleanup and import. This is done via @Singleton and @Schedule annotation. Unfortunately when deploying in a cluster this bean is executed on all nodes.
package session;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Date;
import javax.ejb.Schedule;
import javax.ejb.Singleton;
import org.jboss.ejb3.annotation.Clustered;
@Singleton
@Clustered
public class MyScheduler {
@Schedule(second = "*/20", minute = "*", hour = "*", persistent = false)
public void printTime() {
System.out.println(getHostName() + ": " + new Date());
}
private String getHostName() {
try {
InetAddress addr = InetAddress.getLocalHost();
return addr.getHostName();
} catch (UnknownHostException e) {
}
return "";
}
}
This example prints the hostname and the current time on all nodes.
That behaviour seems to fit the EJB 3.1 requirements but is quite useless for me (and probably others). So how can I implement an high available singleton in a cluster? If there is no way how can I block the other nodes singleton instances so that only one gets executed?
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15 years, 2 months
[jBPM] - Problem with Orchestration projects
by Dnyanesh ginde
Dnyanesh ginde [http://community.jboss.org/people/dnyanesh.ginde] created the discussion
"Problem with Orchestration projects"
To view the discussion, visit: http://community.jboss.org/message/583203#583203
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Hello,
I am using Jboss AS 5.1.0GA(jdk 6 version) and Jboss ESB-4.9. I have deployed Jboss ESB on the Jboss AS. I have changed the database from hsql DB to Oracle. Everything seems to be fine when I start the server. All the .esb are deployed in the default server profile. All the ESB and JBPM tables are created in the Oracle DB. There are no exceptions on server startup.
When I try to run the Orchestration projects given in the samples directory of the Jboss-4.9 distribution the following happens
1) ant deploy process runs fine.
2) ant deployProcess runs fine.
3) The ant startProcess fails with the following exception:
03:45:15,377 ERROR [GraphElement] action threw exception: null
java.lang.NullPointerException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.jbpm.instantiation.Delegation.instantiate(Delegation.java:162)
at org.jbpm.instantiation.Delegation.getInstance(Delegation.java:126)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(Ja
vassistLazyInitializer.java:197)
at org.jbpm.instantiation.Delegation_$$_javassist_57.getInstance(Delegat
ion_$$_javassist_57.java)
at org.jbpm.graph.def.Action.execute(Action.java:136)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(Ja
vassistLazyInitializer.java:197)
at org.jbpm.graph.def.Action_$$_javassist_80.execute(Action_$$_javassist
_80.java)
at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:280)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(Ja
vassistLazyInitializer.java:197)
at org.jbpm.graph.def.Node_$$_javassist_127.executeAction(Node_$$_javass
ist_127.java)
at org.jbpm.job.ExecuteActionJob.execute(ExecuteActionJob.java:33)
at org.jbpm.job.executor.JobExecutorThread.executeJob(JobExecutorThread.
java:172)
at org.jbpm.job.executor.JobExecutorThread.run(JobExecutorThread.java:63
)
The process is deployed in the database and I can view the process in the jbpm-console.
Can anybody kindly help me with this error? I am a newbie to Jboss ESB.
Thanks & Regards,
Dnyanesh Ginde
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15 years, 2 months