I have a problem with cluster (HA) JNDI lookups in JBoss 4.0.1SP1.
We start 2 RMI based services and bind them in JNDI using the following code
| String partitionName = System.getProperty(PROP_JBOSS_PARTITION,
DEFAULT_JBOSS_PARTITION_NAME);
| InitialContext context = new InitialContext();
| // ...
| context.bind("TLDServerWorking", rmiServerWorking);
| ...
| context.bind("TLDServerLive", rmiServerLive);
|
Some other applications running in the same JBoss cluster partition should
lookup this RMI server using the following code:
| Properties props = new Properties();
| props.setProperty("java.naming.factory.initial",
"org.jnp.interfaces.NamingContextFactory");
| props.setProperty("java.naming.provider.url", "jnp://localhost:8282/");
// HA JNDI port
| InitialContext rpcContext = new InitialContext(props);
| // ...
| this.RMIServer = (FTRMIServer) rpcContext.lookup(name);
|
So we bind the services using the local JNDI tree and we do the lookup using
the HA JNDI tree. Fro all documentation we found so far, this seems to be the
way to do it in a clustered JBoss. Please correct me, if I am wrong.
We already saw this code working, but this seems to be quite instable.
Sometimes (in most cases) the lookup fails with NameNotFound.
To track down the problem we used twiddle to view the JNDI trees and this shows
very strange effects. You get different results if you call it multiple times:
First call:
| >twiddle.bat -s localhost:8382 invoke "jboss:service=JNDIView" list true
| ...
| <h1>Global JNDI Namespace</h1>
| <pre>
| +- TLDServerLive (class: com.poet.xs.tld.server.RMIServer)
| +- jmx (class: org.jnp.interfaces.NamingContext)
| | +- invoker (class: org.jnp.interfaces.NamingContext)
| | | +- RMIAdaptor (proxy: $Proxy13 implements interface
org.jboss.jmx.adaptor.rmi.RMIAdaptor,interface
org.jboss.jmx.adaptor.rmi.RMIAdaptorExt,interface
org.jboss.proxy.IClientContainer)
| | +- rmi (class: org.jnp.interfaces.NamingContext)
| | | +- RMIAdaptor[link -> jmx/invoker/RMIAdaptor] (class:
javax.naming.LinkRef)
| +- HAPartition (class: org.jnp.interfaces.NamingContext)
| | +- EC_1120654668872 (class:
org.jboss.ha.framework.server.HAPartitionImpl)
| +- HASessionState (class: org.jnp.interfaces.NamingContext)
| | +- Default (class:
org.jboss.ha.hasessionstate.server.HASessionStateImpl)
| </pre>
|
Later call:
| >twiddle.bat -s localhost:8382 invoke "jboss:service=JNDIView" list true
| ...
| <h1>Global JNDI Namespace</h1>
| <pre>
| +- TLDServerLive (class: com.poet.xs.tld.server.RMIServer)
| +- jmx (class: org.jnp.interfaces.NamingContext)
| | +- invoker (class: org.jnp.interfaces.NamingContext)
| | | +- RMIAdaptor (proxy: $Proxy13 implements interface
org.jboss.jmx.adaptor.rmi.RMIAdaptor,interface
org.jboss.jmx.adaptor.rmi.RMIAdaptorExt,interface
org.jboss.proxy.IClientContainer)
| | +- rmi (class: org.jnp.interfaces.NamingContext)
| | | +- RMIAdaptor[link -> jmx/invoker/RMIAdaptor] (class:
javax.naming.LinkRef)
| +- TLDServerWorking (class: com.poet.xs.tld.server.RMIServer)
| +- HAPartition (class: org.jnp.interfaces.NamingContext)
| | +- EC_1120654668872 (class:
org.jboss.ha.framework.server.HAPartitionImpl)
| +- HASessionState (class: org.jnp.interfaces.NamingContext)
| | +- Default (class:
org.jboss.ha.hasessionstate.server.HASessionStateImpl)
| </pre>
|
Can anybody give me an explanation for this?
Something to check in the configuration?
Thanks for any help.
/Klaus
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