Cannot access WL6.1 SP3 server
Dear All,
For some reason I'm getting a NoSuchFieldError thrown everytime I attempt to access be Weblogic 6.1 SP3 server. This exception gets thrown once on an attempt to access the service via HTTP. A second request crashes the WL JVM.
I notice a CR has been released for this problem and fixed in SP6. Unfortunately, due to problems with licensing I'm stuck with SP3. Is there a work-around for this?
Kind regards
-- Ricardo <[email protected]>
####<09-Nov-04 11:12:19 GMT> <Info> <NT Performance Pack> <LON-OTP-DES-172> <testserver> <ExecuteThread: '14' for queue: 'default'> <> <> <000000> <Allocating: '2' NT reader threads>
####<09-Nov-04 11:12:19 GMT> <Error> <NT Performance Pack> <LON-OTP-DES-172> <testserver> <ExecuteThread: '12' for queue: 'default'> <> <> <000000> <failure in processSockets() - GetData: 'weblogic.socket.NTSocketMuxer$GetData - native pointer: '0', numBytes: '0''>
java.lang.NoSuchFieldError: fd
at weblogic.socket.NTSocketMuxer.getNextSocket(Native Method)
at weblogic.socket.NTSocketMuxer.processSockets(NTSocketMuxer.java:589)
at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:24)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120
best guess would be to disable native IO.
- Anders M.
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Any feedback would be greatly appreciated. THANKS!
-Alan May
Scenario:
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I stopped server a, removed the fouled connection factories on server
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Any recommendations? Please let me know if it would be helpful for me to
clarify any points.
Server a's original error:
weblogic.jms.common.InvalidClientIDException: Client id, Parser.topicPrime,
is in use
Start server side stack trace:
weblogic.jms.common.InvalidClientIDException: Client id, Parser.topicPrime,
is in use
at
weblogic.jms.frontend.FEConnection.setClientId(FEConnection.java:918)
at weblogic.jms.frontend.FEConnection.<init>(FEConnection.java:178)
at
weblogic.jms.frontend.FEConnectionFactory$1.run(FEConnectionFactory.java:319
at weblogic.management.internal.Helper.doLocally(Helper.java:1656)
at
weblogic.jms.frontend.FEConnectionFactory.connectionCreate(FEConnectionFacto
ry.java:316)
at weblogic.jms.frontend.FEConnectionFactory_WLSkel.invoke(Unknown
Source)
at
weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:305)
at
weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java
:93)
at
weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:274)
at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:2
2)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
End server side stack trace
Hi Alan,
Lots of questions in one message! I'm going to
try and answer them using the shotgun approach -- let
me know if I miss.
(1) It is good practice to close JMS resources when you are done
with them, even if the destination host server crashes. The reason
is that the connection resource may be hosted on a different
WL server than the destination.
(2) Creating a session/producer per message is heavy-weight
in terms of CPU and network - if your app is performance
sensitive is is better to cache these resources for re-use.
See the JMS Performance Guide for details.
(3) From your description I can't tell which two
clients are conflicting. If what I'm writing here
doesn't help, please try to narrow it down and repost.
(4) Make sure that the connection factory does not have
a "client-id" configured for it. Otherwise only one client
can use the connection factory - instead have individual
clients dynamically set their ids.
(5) Note that client-ids are usually only useful for
durable subscriber access, as other types of clients
generally don't need exclusive connections, and therefore
don't need client-ids.
(6) The attached notes, which are for MDBs, may help you
understand durable subscriptions and client-id's better in general.
Tom
Alan May wrote:
> Any feedback would be greatly appreciated. THANKS!
>
> -Alan May
>
>
> Scenario:
>
> Two weblogic 6.1 sp3 instances running on two separate Solaris 8 boxes.
>
> Server a - a message producer(client) for a number of topics and queues on b
>
> Server b - hosts JMS services including all the topics and queues, has both
> message producers and mdb consumers for a number of topics and queues
>
> What I've set up: a durable connection factory for topics for server a,
> topics for server b, queues for server a, and queues for server b (all
> targeted to server b)
>
> I have a singleton on each server that has methods to retrieve the queue
> connection or topic connection appropriate for that server(a single
> connection is
> shared for all topic producers and a separate connection is share for all
> queue producers for each server)
>
> I have each producer open and close a new session every time. However, the
> topic and queue connections are shared for all producers for that JVM. This
> seemed to be the approach recommended by the JMS spec, but do you feel this
> is the appropriate granularity given the above scenario? I am not currently
> closing my jms connection as part of a weblogic shutdown class. Is that
> essential in that case? If the server crashes - are there any
> recommendations on how to handle(if closing the connection is the issue)?
>
> I've confirmed that my JMS clients running with server b are not using the
> connection factories setup for a's use.
>
> Issue:
> ------
> Everything works on server b as expected.
>
> Server a's connections seemed to be fouled. I was getting that the clientid
> was in use(stack trace included below) while trying to fetch the connection.
>
> I stopped server a, removed the fouled connection factories on server
> b(dedicated for server a's use), and created new connection factories for
> a's use. I stopped server b and deleted everything from the two JMSState
> and JMSStore tables, restarted a then b, and tried the test again. This
> time the singleton code could fetch the connection without receiving a
> JMSException, but I was getting an exception when I tried to open a session
> from the connection.
>
> If worst comes to worse, I can stick a stateless session bean on b, to act
> as a delegate producer on behalf of server a, but I'd like to avoid it if
> possible.
>
> Any recommendations? Please let me know if it would be helpful for me to
> clarify any points.
>
>
>
> Server a's original error:
> weblogic.jms.common.InvalidClientIDException: Client id, Parser.topicPrime,
> is in use
>
> Start server side stack trace:
> weblogic.jms.common.InvalidClientIDException: Client id, Parser.topicPrime,
> is in use
> at
> weblogic.jms.frontend.FEConnection.setClientId(FEConnection.java:918)
> at weblogic.jms.frontend.FEConnection.<init>(FEConnection.java:178)
> at
> weblogic.jms.frontend.FEConnectionFactory$1.run(FEConnectionFactory.java:319
> )
> at weblogic.management.internal.Helper.doLocally(Helper.java:1656)
> at
> weblogic.jms.frontend.FEConnectionFactory.connectionCreate(FEConnectionFacto
> ry.java:316)
> at weblogic.jms.frontend.FEConnectionFactory_WLSkel.invoke(Unknown
> Source)
> at
> weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:305)
> at
> weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java
> :93)
> at
> weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:274)
> at
> weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:2
> 2)
> at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
> End server side stack trace
>
>
A durable topic subscriber MDB uses its name to generate its client-id.
Since JMS enforces uniqueness on this client-id, this means that if a durable
subscriber MDB is deployed to multiple servers only one server will be able
to connect. Some applications want a different behavior where
each MDB pool on each server gets its own durable subscription.
The MDB durable subscription id, which must be unique on its topic, comes from:
1) <jms-client-id>MyClientID</jms-client-id>
(the weblogic dtd)
2) if (1) is not set then the client-id
comes from the ejb name.
The durable subscription is uniquely identified within a cluster by a
combination of "connection-id" and "subscription-id". Only one active
connection may use a particular "connection-id" within a WebLogic cluster.
The connection id comes from:
1) The "ClientId" attribute configured on the WebLogic connection factory.
This defaults to null. Note that if the ClientId is set on a connection
factory, only one connection created by the factory
may be active at a time.
2) If (1) is not set, then, as with the subscriber-id,
the connection-id is derived from jms-client-id descriptor attribute:
<jms-client-id>MyClientID</jms-client-id>
(the weblogic dtd)
3) If (1) and (2) are not set, then, as with the subscriber-id,
the connection-id is derived from the ejb name.
Work-around:
A) Create a custom connection-factory for each server:
1) configure "JNDIName" to the same value across all servers
("myMDBCF" in this example)
2) configure "ClientId" to a unique value per server
3) enable "UserTransactionsEnabled"
4) enable "XAConnectionFactoryEnabled"
5) set "AcknowledgePolicy" to "ACKNOWLEDGE_PREVIOUS"
6) target the CF at a single WebLogic server
(Number 5 is required for non-transactional topic MDBs)
B) In the MDB's weblogic-ejb-jar.xml descriptor, set the MDB's connection
factory to the JNDI name of the custom connection factories configured in
(A). Optionally, also specify the subscriber-id via the jms-client-id
attribute.
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>exampleBean</ejb-name>
<message-driven-descriptor>
<connection-factory-jndi-name>myMDBCF</connection-factory-jndi-name>
<jms-client-id>myClientID</jms-client-id>
</message-driven-descriptor>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
C) Target the application at the same servers that have the custom connection
factories targeted at them.
Notes/Limitations:
1) If the MDB is moved from one server to another, the MDB's corresponding
connection-factory must be moved with it.
2) This work-around will not work if the destination is not in the same
cluster as the MDB. (The MDB can not use the local connection factory, which
contains the connection-id, as connection factories do not work unless they
are in the same cluster as the destination.)
3) This work-around will not work for non-WebLogic JMS topics.
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