4:40 p.m.
Daniel Bevenius [http://community.jboss.org/people/beve] created the discussion
"Re: JMS module (HornetQ) can't find my class from WAR"
To view the discussion, visit: http://community.jboss.org/message/635654#635654
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Hi,
I'm not sure I've got the full picture of your application. Does your applications
consist on a single war, that is it is both producing messages and consuming messages?
I've seen a similar issue but in my case I had an ear, consisting of a war and an ejb.
The war posted a ObjectMessage to a queue that an MDB, located in the ejb, listened to.
The Object being posted was located in the war.
When the MDB called objMessage.getObject() I got the following exception:
08:16:27,282 ERROR [stderr] (Thread-5 (group:HornetQ-client-global-threads-2068899844))
javax.jms.JMSException: se.rl.domain.User from [Module "org.hornetq:main" from
local module loader @508aeb74 (roots:
/work/jboss/as/as7/jboss-as/build/target/jboss-as-7.1.0.Alpha2-SNAPSHOT/modules)]
08:16:27,282 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
08:16:27,283 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:485)
08:16:27,283 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:444)
08:16:27,283 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:421)
08:16:27,284 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:143)
08:16:27,284 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
java.lang.Class.forName0(Native Method)
08:16:27,284 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
java.lang.Class.forName(Class.java:247)
08:16:27,285 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:603)
08:16:27,285 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
org.hornetq.utils.ObjectInputStreamWithClassLoader.resolveClass(ObjectInputStreamWithClassLoader.java:71)
08:16:27,286 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1574)
08:16:27,286 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
08:16:27,286 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
08:16:27,286 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
08:16:27,287 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
08:16:27,287 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
org.hornetq.jms.client.HornetQObjectMessage.getObject(HornetQObjectMessage.java:158)
08:16:27,288 ERROR [stderr] (Thread-5
(group:HornetQ-client-global-threads-2068899844)) at
se.rl.migrate.mdb.GreeterMDB.onMessage(GreeterMDB.java:42)
In my case, I was getting this because when trying to locate the class the ThreadContext
classloader is first used. The ThreadContext classloader of the mdb module does not have
any knowledge of classes in the war, so the code will fallback and try using the
'org.hornetq:main' module and then throw the error displayed above.
I was able to add an explicit dependency from my ejb to my war by adding a manifest header
to the ejbs manifest.mf:
Dependencies: deployment.earName.ear.warName.war
This is only for testing and I'd probably extract the objects into a separate jar and
add them to the lib directory of the ear.
Not sure if this helps you at all but thought I'd post it just in case.
Regards,
/Daniel
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8:38 p.m.
New subject: [JBoss AS 7 Development] - Re: JMS module (HornetQ) can't find my class from WAR
jaikiran pai [http://community.jboss.org/people/jaikiran] created the discussion
"Re: JMS module (HornetQ) can't find my class from WAR"
To view the discussion, visit: http://community.jboss.org/message/637914#637914
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I believe Daniel already has figured out the real issue. i.e. the classes in the .war are
isolated (as per spec) and aren't visible to the MDB (which is in a separate EJB
deployment even though the same .ear).
But a side issue here is that the exception stacktrace is misleading (unless one goes and
looks into the ObjectInputStream code). That stacktrace gives an impression that it is
using a wrong module to load the object's class but doesn't give any indication
that it's using that as a fallback mechanism because it failed to resolve that on the
first attempt while using the (correct) deployment classloader.
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10:42 p.m.
New subject: [JBoss AS 7 Development] - Re: JMS module (HornetQ) can't find my class from WAR
ronorato [http://community.jboss.org/people/ronorato] created the discussion
"Re: JMS module (HornetQ) can't find my class from WAR"
To view the discussion, visit: http://community.jboss.org/message/637942#637942
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Do I need to do any thing special to get this working if I have my objects in a JAR file
that is located in the lib directory of the EAR? It seems that my webapp (located in a
war file inside the ear file) is able to publish events to a HornetQ topic, but my EJB,
also located in the ear, is not able to receive the messages. It fails during the
deserialization process. I see the onMessage getting called which then calls a private
method that does the deserialization. It is in this method that I get the exception.
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11:06 p.m.
New subject: [JBoss AS 7 Development] - Re: JMS module (HornetQ) can't find my class from WAR
jaikiran pai [http://community.jboss.org/people/jaikiran] created the discussion
"Re: JMS module (HornetQ) can't find my class from WAR"
To view the discussion, visit: http://community.jboss.org/message/637946#637946
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ronorato wrote:
It seems that my webapp (located in a war file inside the ear file) is able to publish
events to a HornetQ topic, but my EJB, also located in the ear, is not able to receive the
messages. It fails during the deserialization process.
The important part is that
the EJB jar will not have access to any classes in the .war. So if the object hierarchy
that you are publishing as a ObjectMessage has any reference to such class(es) then it
will fail. The right thing to do in such cases is package such classes in a .jar and place
them in the .ear/lib so that they are accessible to both the .war and the EJB modules.
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12:07 p.m.
New subject: [JBoss AS 7 Development] - Re: JMS module (HornetQ) can't find my class from WAR
ronorato [http://community.jboss.org/people/ronorato] created the discussion
"Re: JMS module (HornetQ) can't find my class from WAR"
To view the discussion, visit: http://community.jboss.org/message/638047#638047
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I add a subscriber to the WAR file for the same topic and it seems to have the same
issue. At this point I am at a loss for how to get this to work. Here is how I have my
project setup.
Here is the EAR manifest:
Ant-Version: Apache Ant 1.8.2
Created-By: 1.6.0_24-b07 (Sun Microsystems Inc.)
Built-By: SCM
Specification-Title: App
Specification-Version: 0.1
Specification-Vendor: Test
Implementation-Title: Application
Implementation-Version: 0.1 November 23 2011
Implementation-Vendor: Application
Dependencies: org.slf4j
Here is the EAR lib contents (This JAR contains the classes that are serialized onto the
JMS):
lib/TAppEvent.jar
At the root level I have my WAR file and the Jar file containing the EJBs.
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4 comments
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participants (3)
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Daniel Bevenius -
jaikiran pai
-
ronorato