This chapter includes the following sections:
Understanding JMS System Modules and Subdeployments
A JMS system module is described by the
jms-system-resource MBean in the
Basic components of a
jms-system-resource MBean are:
name: Name of the module.
target: Server, cluster, or migratable target the module is targeted to.
sub-deployment: A mechanism by which JMS system module resources (such as queues, topics, and connection factories) are grouped and targeted to a server resource (such as a JMS server instance, WebLogic Server instance, or cluster).
descriptor-file-name: Path and file-name of the system module file.
The JMS resources of a system module are located in a module descriptor file that conforms to the
weblogic-jmsmd.xml schema. In Figure 6-1, the module is named
myModule-jms.xml and it contains JMS system resource definitions for a connection factory and a queue. The
sub-deployment-name element is used to group and target JMS resources in the
-jms.xml file to
targets in the
config.xml. You have to provide a value for the
sub-deployment-name element when using WLST. For more information on subdeployments, see JMS System Module and Resource Subdeployment Targeting. In Figure 6-1, the
sub-deployment-name DeployToJMSServer1 is used to group and target the connection factory
CConfac and the queue
CQueue in the
For more information about how to use JMS resources, see What Are JMS Configuration Resources?.
Figure 6-1 Subdeployment Architecture
Description of "Figure 6-1 Subdeployment Architecture"
How to Create JMS Servers and JMS System Module Resources
Creating JMS servers and JMS system module resources using WLST include the basic tasks of starting an edit session, creating a JMS system module, and creating a JMS server resource.
After you have established an edit session, use the following steps to configure JMS servers and system module resources:
- Get the WebLogic Server MBean object for the server that you want to configure resources. For example:
servermb=getMBean("Servers/examplesServer") if servermb is None: print '@@@ No server MBean found'
- Create your system resource. For example:
jmsMySystemResource = create(myJmsSystemResource,"JMSSystemResource")
- Target your system resource to a WebLogic Server instance. For example:
- Get your system resource object. For example:
theJMSResource = jmsMySystemResource.getJMSResource()
- Create resources for the module, such as queues, topics, and connection factories. For example:
connfact1 = theJMSResource.createConnectionFactory(factoryName) jmsqueue1 = theJMSResource.createQueue(queueName)
- Configure resource attributes. For example:
- Create a subdeployment name for system resources. See Understanding JMS System Modules and Subdeployments. For example:
- Create a JMS server. For example:
jmsserver1mb = create(jmsServerName,'JMSServer')
- Target your JMS server to a WebLogic Server instance or cluster. For example:
- Create a subdeployment object using the
value you provided for the sub-deployment-nameelement. This step groups the system resources in
module to a sub-deployment
element in the config.xml. For example:
subDep1mb = jmsMySystemResource.createSubDeployment('DeployToJMSServer1')
- Target the subdeployment to a server resource such as a JMS server instance, WebLogic Server instance, or cluster. For example:
Example 6-1 WLST Script to Create JMS System Resources
""" This script starts an edit session, creates a JMS Server, targets the jms server to the server WLST is connected to and creates a JMS System module with a jms queue and connection factory. The jms queues and topics are targeted using sub-deployments. """ import sys from java.lang import System print "@@@ Starting the script ..." myJmsSystemResource = "CapiQueue-jms" factoryName = "CConFac" jmsServerName = "myJMSServer" queueName = "CQueue" url = sys.argv usr = sys.argv password = sys.argv connect(usr,password, url) edit() startEdit() //Step 1 servermb=getMBean("Servers/examplesServer") if servermb is None: print '@@@ No server MBean found' else: //Step 2 jmsMySystemResource = create(myJmsSystemResource,"JMSSystemResource") //Step 3 jmsMySystemResource.addTarget(servermb) //Step 4 theJMSResource = jmsMySystemResource.getJMSResource() //Step 5 connfact1 = theJMSResource.createConnectionFactory(factoryName) jmsqueue1 = theJMSResource.createQueue(queueName) //Step 6 connfact1.setJNDIName(factoryName) jmsqueue1.setJNDIName(queueName) //Step 7 jmsqueue1.setSubDeploymentName('DeployToJMSServer1') connfact1.setSubDeploymentName('DeployToJMSServer1') //Step 8 jmsserver1mb = create(jmsServerName,'JMSServer') //Step 9 jmsserver1mb.addTarget(servermb) //Step 10 subDep1mb = jmsMySystemResource.createSubDeployment('DeployToJMSServer1') //Step 11 subDep1mb.addTarget(jmsserver1mb) . . .
How to Modify and Monitor JMS Servers and JMS System Module Resources
You can modify or monitor JMS objects and attributes by using the appropriate method available from the MBean.
Modify JMS objects and attributes using the set, target, untarget, and delete methods.
Monitor JMS runtime objects using get methods.
Example 6-2 shows a sample WLST script to modify JMS objects.
See Navigating MBeans (WLST Online) in Understanding the WebLogic Scripting Tool.
Example 6-2 WLST Script to Modify JMS Objects
. . print '@@@ delete system resource' jmsMySystemResource = delete("CapiQueue-jms","JMSSystemResource") print '@@@ delete server' jmsserver1mb = delete(jmsServerName,'JMSServer') . . .
Best Practices When Using WLST to Configure JMS Resources
Learn about best practices when using WLST to configure JMS servers and JMS system module resources.
Trap for Null MBean objects (such as servers, JMS servers, modules) before trying to manipulate the MBean object.
Use a meaningful name when providing a subdeployment name. For example, the subdeployment name DeployToJMSServer1 tells you that all subdeployments with this name are deployed to JMSServer1.