Phantom JMS Queues with WLST

Question

Hello,
I just started using WLST, and I've written a rather long script that creates
a JMS server and some queues, among other things.
I based my code on the JMS server creation example, and it works perfectly as
long as the JMS server doesn't already exist. If it does, I get output like this:
JMS Server already exists.
[Caching Stub]Proxy for mydomain:Name=myjs,Type=JMSServer
*** JMSQueue with name 'myAuditQ' has been created successfully.
JMS destination is already parented
Setting Type
Setting JNDIName
Traceback (innermost last):
File "<input>", line 1, in ?
File "loaddm.py", line 16, in doit
File "setupServer.py", line 274, in ?
File "<iostream>", line 145, in set
WLSTException: 'Error occured while performing set : Unknown Error. Use dumpStack()
to view the error stack trace'
The line I put the *** by is interesting because the queue that was just created
already exists, yet the create() does not throw any exceptions.
Once this happens, I can do something like the following to add to the confusion:
wls:/mydomain/config> cd('JMSQueue/myAuditQ')
wls:/mydomain/config/JMSQueue/myAuditQ> ls()
Traceback (innermost last):
File "<input>", line 1, in ?
File "<iostream>", line 176, in ls
WLSTException: 'Error occured while performing ls : Could not find an MBean
instance while doing getAttribute. Use dumpStack() to view the error stack trace'
wls:/mydomain/config/JMSQueue/myAuditQ> dumpStack()
javax.management.InstanceNotFoundException: mydomain:Name=myAuditQ,Type=JMSQueue
at weblogic.rjvm.BasicOutboundRequest.sendReceive(BasicOutboundRequest.j
ava:108)
at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:138)
at weblogic.management.internal.RemoteMBeanServerImpl_812_WLStub.getMBea
nInfo(Unknown Source)
at weblogic.management.scripting.InformationHandler.getAllAttributes(Inf
ormationHandler.java:754)
at weblogic.management.scripting.InformationHandler.la(InformationHandle
r.java:538)
at weblogic.management.scripting.InformationHandler.ls(InformationHandle
r.java:146)
at weblogic.management.scripting.WLScriptContext.ls(WLScriptContext.java
:387)
The code that generates this error is like this:
try:
r=create(cNode+'js','JMSServer')
except Exception:
print "JMS Server already exists."
r=getTarget('JMSServer/'+cNode+'js')
if clustered:
target=getTarget('Server/'+cNode)
try:
r.addTarget(target)
except Exception:
print "JMS server is already targeted."
print r
for dest,attr in jms.items():
try:
q=create(dest+suffix,'JMS'+attr['Type'])
except Exception:
print "JMS Destination already exists."
q=
getTarget('JMS'+attr['Type']+'/'+dest+suffix)
try:
q.setParent(r)
except Exception:
print "JMS destination is already parented"
cd('JMS'+attr['Type']+'/'+dest+suffix)
for att, val in attr.items():
print "Setting "+att
if att != 'Type':
set(att,val)
cd('/')

Answer 1

This seems to be a larger problem that I initially thought. Ideally
weblogic server will not allow you to create an MBean with same name
since it will collide with the unique object name for that MBean in the
MBeanServer. From your posting I did not understand if you were able to
create an MBean with the same name and did not get a
InstanceAlreadyExists Exception. If you did get it then seems like there
is a problem in the way the server is persisting the config.xml. There
shouldn't be duplicate entries. Please file a support case [email protected].
Thanks,
-satya
Justin Dossey wrote:
(top replying because of the long post)
It looks like this was caused by Weblogic 8 allowing WLST to create invalid domain
configuration (config.xml). I opened config.xml up in an editor and found that
even though I had been using Try: create(foo)/ except Exception: (getTarget(foo)),
there were (many) duplicate entries for MBeans in config.xml. For instance, one
Server was in there four times. Almost every Server had four or more SSL entries
in config.xml. There were many unparented JMS Queues defined, as well-- this
is what I believe caused my problem.
So why does the try create actually create duplicate when an instance already
exists?
"Justin Dossey" <[email protected]> wrote:
Hello,
I just started using WLST, and I've written a rather long script that
creates
a JMS server and some queues, among other things.
I based my code on the JMS server creation example, and it works perfectly
as
long as the JMS server doesn't already exist. If it does, I get output
like this:
JMS Server already exists.
[Caching Stub]Proxy for mydomain:Name=myjs,Type=JMSServer
*** JMSQueue with name 'myAuditQ' has been created successfully.
JMS destination is already parented
Setting Type
Setting JNDIName
Traceback (innermost last):
File "<input>", line 1, in ?
File "loaddm.py", line 16, in doit
File "setupServer.py", line 274, in ?
File "<iostream>", line 145, in set
WLSTException: 'Error occured while performing set : Unknown Error. Use
dumpStack()
to view the error stack trace'
The line I put the *** by is interesting because the queue that was just
created
already exists, yet the create() does not throw any exceptions.
Once this happens, I can do something like the following to add to the
confusion:
wls:/mydomain/config> cd('JMSQueue/myAuditQ')
wls:/mydomain/config/JMSQueue/myAuditQ> ls()
Traceback (innermost last):
File "<input>", line 1, in ?
File "<iostream>", line 176, in ls
WLSTException: 'Error occured while performing ls : Could not find
an MBean
instance while doing getAttribute. Use dumpStack() to view the error
stack trace'
wls:/mydomain/config/JMSQueue/myAuditQ> dumpStack()
javax.management.InstanceNotFoundException: mydomain:Name=myAuditQ,Type=JMSQueue
at weblogic.rjvm.BasicOutboundRequest.sendReceive(BasicOutboundRequest.j
ava:108)
at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:138)
at weblogic.management.internal.RemoteMBeanServerImpl_812_WLStub.getMBea
nInfo(Unknown Source)
at weblogic.management.scripting.InformationHandler.getAllAttributes(Inf
ormationHandler.java:754)
at weblogic.management.scripting.InformationHandler.la(InformationHandle
r.java:538)
at weblogic.management.scripting.InformationHandler.ls(InformationHandle
r.java:146)
at weblogic.management.scripting.WLScriptContext.ls(WLScriptContext.java
:387)
The code that generates this error is like this:
try:
r=create(cNode+'js','JMSServer')
except Exception:
print "JMS Server already exists."
r=getTarget('JMSServer/'+cNode+'js')
if clustered:
target=getTarget('Server/'+cNode)
try:
r.addTarget(target)
except Exception:
print "JMS server is already targeted."
print r
for dest,attr in jms.items():
try:
q=create(dest+suffix,'JMS'+attr['Type'])
except Exception:
print "JMS Destination already exists."
q=
getTarget('JMS'+attr['Type']+'/'+dest+suffix)
try:
q.setParent(r)
except Exception:
print "JMS destination is already parented"
cd('JMS'+attr['Type']+'/'+dest+suffix)
for att, val in attr.items():
print "Setting "+att
if att != 'Type':
set(att,val)
cd('/')