Red Hat Summit Red Hat SummitSupportoConsoleSviluppatoriInizia una provaContatti

Questo contenuto non è disponibile nella lingua selezionata.

23.4. Stateful Session Bean in EJB 2.x

Clustering stateful session beans is more complex than clustering their stateless counterparts since JBoss needs to manage the state information. The state of all stateful session beans are replicated and synchronized across the cluster each time the state of a bean changes. The JBoss Enterprise Application Platform uses the HASessionStateService bean to manage distributed session states for clustered EJB 2.x stateful session beans. In this section, we cover both the session bean configuration and the HASessionStateService bean configuration.

23.4.1. The EJB application configuration
Copia collegamento

In the EJB application, you need to modify the jboss.xml descriptor file for each stateful session bean and add the <clustered> tag. 
<jboss>    
  <enterprise-beans>
    <session>        
      <ejb-name>nextgen.StatefulSession</ejb-name>
      <jndi-name>nextgen.StatefulSession</jndi-name>
      <clustered>True</clustered>
      <cluster-config>
        <partition-name>DefaultPartition</partition-name>
        <home-load-balance-policy>org.jboss.ha.framework.interfaces.RoundRobin</home-load-balance-policy>
        <bean-load-balance-policy>org.jboss.ha.framework.interfaces.FirstAvailable</bean-load-balance-policy>          
        <session-state-manager-jndi-name>/HASessionState/Default</session-state-manager-jndi-name>        
      </cluster-config>
    </session>
  </enterprise-beans>
</jboss>
Copy to Clipboard Toggle word wrap
In the bean configuration, only the <clustered> tag is mandatory to indicate that the bean works in a cluster. The <cluster-config> element is optional and its default attribute values are indicated in the sample configuration above.
The <session-state-manager-jndi-name> tag is used to give the JNDI name of the HASessionStateService to be used by this bean.
The description of the remaining tags is identical to the one for stateless session bean. Actions on the clustered stateful session bean's home interface are by default load-balanced, round-robin. Once the bean's remote stub is available to the client, calls will not be load-balanced round-robin any more and will stay "sticky" to the first node in the list.
Torna in cima
Red Hat logoGithubredditYoutubeTwitter

Formazione

Prova, acquista e vendi

Community

Informazioni sulla documentazione di Red Hat

Aiutiamo gli utenti Red Hat a innovarsi e raggiungere i propri obiettivi con i nostri prodotti e servizi grazie a contenuti di cui possono fidarsi. Esplora i nostri ultimi aggiornamenti.

Rendiamo l’open source più inclusivo

Red Hat si impegna a sostituire il linguaggio problematico nel codice, nella documentazione e nelle proprietà web. Per maggiori dettagli, visita il Blog di Red Hat.

Informazioni su Red Hat

Forniamo soluzioni consolidate che rendono più semplice per le aziende lavorare su piattaforme e ambienti diversi, dal datacenter centrale all'edge della rete.

Theme

© 2025 Red Hat