It all started with wanting to look at the MQ configuration within MQWEB and z/OS Connect. I could not find a way of displaying the Liberty configuration information. I could look at the *.xml files, but this did not give me the information which is not in the configuration files. I thought about writing a Liberty feature which printed out the configuration, but then I stumbled across OSGI and the ability to query configuration information from outside of Liberty.
What is OSGI ?
The OSGi specification describes a modular system and a service platform for the Java programming language that implements a complete and dynamic component model, something that does not exist in standalone Java/VM environments. Applications or components, coming in the form of bundles for deployment, can be remotely installed, started, stopped, updated, and uninstalled without requiring a reboot; management of Java packages/classes is specified in great detail. Application life cycle management is implemented via APIs that allow for remote downloading of management policies. The service registry allows bundles to detect the addition of new services, or the removal of services, and adapt accordingly.Wikipedia
OSGI uses the term “bundle”. It looks like a bundle is a jar file, and the facilities within it. Listing one bundle had com.ibm.ws.ssl_1.3.41.cl200620200528-0414  in it.
- com.ibm.ws.ssl_1.3.41 is a jar file com.ibm.ws.ssl_1.3.41.jar
- many files had cl200620200528-0414
-  this was for bundle 72.
How does it work?
Each program package(jar file) contains a manifest.mf file. For example
Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-Name: MyService bundle Bundle-SymbolicName: com.sample.myservice Bundle-Version: 1.0.0 Bundle-Activator: com.sample.myservice.Activator Import-Package: org.apache.commons.logging;version="1.0.4" Export-Package: com.sample.myservice.api;version="1.0.0"
This gives information on
- Information about your package (including its version number).
- The entry point for the bundle.
- What services it provide to other packages (com.sample.myservice.api).
- What services it needs from other packages in order for it to work (com.sample.myservice.api).
OSGI sorts out all of these dependencies, provides access to the configuration in the *.xml files and additional configuration data hidden within the packages.
How can I use it to display configuration?
This is not very well documented. I think it is dangerous, as the osgi port allows unauthenticated access to start and stop services. I have not been able to restrict it to authorised users, or control what users have access to.
I found the following….
You need to specify in your Liberty *.xml files
in the bootstrap.properties file. For example osgi.console=10.1.3.10:5471 . I found a reference to osgi.console.ssh=ip:port, but this port was not opened during liberty startup.
If you specify osgi.console=5471, this uses the localhost 127.0.0.1, so you can only access it from the local machine. For example TSO TELNET 127.0.0.1 5471. Telnet from TSO is not very usable – it is better to use a telnet session from off z/OS, for example Linux.
From Linux I used:
telnet 10.1.3.10 5471 |tee -i osgi.log
This allowed me to issue interactive commands, and have the output written to the osgi.log file.
There are a variety of commands to display, start stop etc.
The list bundle command lb gave over 200 entries like
177|Active | 12|com.ibm.ws.messaging.jmsspec.common... 178|Active | 12|com.ibm.websphere.javaee.jms.2.0 ... 179|Active | 12|WMQ Resource Adapter ...
The command bundle 179 gave information about the WMQ Resource Adapter above.
I used the bundles command to list all information about all bundles. I then used some python script to process the log file and write information about each bundle to its own file. From the jca file I could see com.ibm.ws.jca.service.ConnectionFactoryService has properties
jndiName=jms/cf1 properties.0.CCSID=819 properties.0.cleanupLevel=SAFE properties.0.cloneSupport=DISABLED properties.0.config.referenceType=com.ibm.ws.jca.properties.wmqJms.jmsConnectionFactory properties.0.connectionfactory-interface=javax.jms.ConnectionFactory properties.0.failIfQuiesce=true properties.0.headerCompression=NONE properties.0.managedconnectionfactory-class=com.ibm.mq.connector.outbound.ManagedConnectionFactoryImpl properties.0.messageCompression=NONE properties.0.messageSelection=CLIENT properties.0.port=1414 properties.0.providerVersion=unspecified properties.0.pubAckInterval=25 properties.0.queueManager=CSQ9 properties.0.rescanInterval=5000 properties.0.resourceAdapterConfig.id=wmqJms properties.0.shareConvAllowed=true properties.0.sparseSubscriptions=false properties.0.sslResetCount=0 properties.0.statusRefreshInterval=60000 properties.0.subscriptionStore=BROKER properties.0.targetClientMatching=true properties.0.transportType=BINDINGS properties.0.wildcardFormat=TOPIC
and I could see the key properties for the queue manager connection.
For my MQ queue I could see
jndiName=jms/stockRequestQueue properties.0.CCSID=1208 properties.0.adminobject-class=com.ibm.mq.connector.outbound.MQQueueProxy properties.0.adminobject-interface=javax.jms.Queue properties.0.arbitraryProperties= properties.0.baseQueueManagerName= properties.0.baseQueueName=STOCK_REQUEST properties.0.config.referenceType=com.ibm.ws.jca.properties.wmqJms.jmsQueue properties.0.encoding=NATIVE properties.0.expiry=APP properties.0.failIfQuiesce=true properties.0.persistence=APP properties.0.priority=APP properties.0.putAsyncAllowed=DESTINATION properties.0.readAheadAllowed=DESTINATION properties.0.readAheadClosePolicy=ALL properties.0.receiveConversion=CLIENT_MSG properties.0.resourceAdapterConfig.id=wmqJms properties.0.targetClient=MQ
and finally I found the connection pool information I was looking for:
connectionTimeout=30 id=ConMgr1 maxIdleTime=1800 maxPoolSize=5 purgePolicy=EntirePool reapTime=180
Phew – what a lot of work to get this information.