IBM MQ V8 annd JMS 2.0

© 2014 IBM Corporation
IBM Software Group WebSphere Software
IBM MQ v8 and JMS 2.0
An Introduction
Luke Saker
sakerl@uk.ibm.com
http://www.slideshare.net/calanais/ibm-mq-v8-and-jms-20

IBM Software Group | WebSphere software
WebSphere MQ
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Therefore, no assurance can be given that an individual user will achieve results
similar to those stated here.

© 2014 IBM Corporation3 WebSphere MQ
IBM MQ V8 delivering best in class enterprise messaging
Platforms &
Standards
Security Scalability System z exploitation
64-bit for all
platforms
Userid authentication
via OS & LDAP
Multiplexed client
performance
64-bit buffer pools in MQ for
z/OS means less paging, more
performance
Support for JMS 2.0
User-based
authorisation for
Unix
Queue manager
vertical scaling
Performance and capacity
Improved support for
.Net and WCF
AMS for IBM i & z/OS
Publish/Subscribe
improvements
Performance enhancements
for IBM Information
Replicator (QRep)
Changes to runmqsc
DNS Hostnames in
CHLAUTH records
Routed
publish/subscribe
Exploit zEDC compression
accelerator
SHA-2 for z, i & NSS
Multiple certificates
per queue manager
Multiple Cluster
Transmit Queue on all
platforms
SMF and shared queue
enhancements

Introduction and Aims
 Aims for you:
– Get some education on what's new and different in JMS 2.0
 Aims for us:
– Gauge adoption of JMS 2.0 and in what environments?
– What business use cases for the new features can you think of?
References:
– JMS 2.0 – JSR 343 Java Message Service (JMS 2.0)
• http://jcp.org/en/jsr/detail?id=343
– Final release on 21 May 2013.
• https://java.net/projects/jms-spec/pages/JMS20FinalRelease
– MQ v8 Announce: 22 April 2014
– MQ v8 Availability:
• 23 May 2014 (eGA Distributed)
• 13 June 2014 (z/OS and pGA Distributed)

JMS 2.0 Headlines – What's new?
[Specification Reference: §1.2]
 Specification updates and clarifications
–Point to Point AND Publish/Subscribe domains required
 New Messaging Features
–Delivery Delay
–Asynchronous Send
–Subscriptions can be shared across a messaging provider
 API Changes
–Use of Java7's java.lang.AutoCloseable
–JMS Simplified API
–Session doesn't need parameters (for JavaEE)
 JavaEE Updates
–Recommendation on provision of a Resource Adapter
–Specification clarifications
–Part of Java EE 7

© 2014 IBM CorporationJuly 1, 2014WebSphere MQ
Simplified API
Messaging Features
JavaEE
Updates

Architecture & Simplified API
[§2]
 Overall messaging architecture still the same
 Best practices all the same
 Still a specification for a messaging and state model
–Not a transport protocol
 Simplified API
–New set of interfaces to reduce number of objects needed
–Aim to make it easier to use within JavaEE and JavaSE
–Faster access to data when creating and manipulating messages
–Error handling changes

Simplified API
[§2.8]
 ConnectionFactory
an administered object to create a
Connection. As used by the classic
API.
 JMSContext
an active connection to a JMS
provider and a single-threaded context
for sending and receiving messages
 JMSProducer
created by a JMSContext, used for
sending messages to a queue or topic
 JMSConsumer
created by a JMSContext, used for
receiving messages sent to a queue
or topic
All based on JMS1.1
Unified Domain concepts

© 2014 IBM CorporationJuly 1, 2014
WebSphere MQ
JMSContext Features
[§6]
 Connection and Session abstraction
 Retains the same semantics, e.g. Temporary destinations for JMSContext
scoped by concept of underlying connection
 AutoStart of underlying connection – i.e. can forget to forget starting the
connection
 Can create duplicate JMSContext, but using same underlying connection
 Application Managed – from createContext() on ConnectionFactory
 Container Managed - @Inject annotation

WebSphere MQ
Producing Messages
[§7]
 JMSProducer
–Can take on role of being 'proxy' message object.
–Message properties set on the producer object prior to sending a 'body'
–Existing MessageProducers can't do that; though have been extended
for new messaging styles
–Method chaining
–'lightweight object' therefore no close

WebSphere MQ
Consuming messages
[§8]
 JMSConsumer
–ReceiveBody(...) methods - message bodies only.
–Not completely symmetrical with sending
• i.e. if want properties still need a message object
 Async and Sync consumption as before
 Can be closed from another thread
–Waits on in-progress consumption to finish

WebSphere MQ
Messages
[§3]
 Message Body only
–JMSProducer & JMSConsumers can now work with the message
bodies without message objects
–Messages have a getBody() method
 After sending message, application free to modify message
 JMSXDeliveryCount is now mandatory [§3.5.11]
–Doesn't have to be exactly correct
• i.e. no persistence of value required
–If JMSRedelivered=true, then JMSXDeliveryCount>=2
–MQ JMS has always set this

WebSphere MQ
Receiving Message Bodies Synchronously
[§8.6]
 <T> T receiveBody( Class<T> c)
●
Receives the next message produced for this JMSConsumer and
returns its body as an object of the specified type
 <T> T receiveBody( Class<T> c, long timeout)
●
Receives the next message produced for this JMSConsumer that
arrives within the specified timeout period, and returns its body as an
object of the specified type
 <T> T receiveBodyNoWait( Class<T> c)
●
Receives the next message produced for this JMSConsumer if one is
immediately available and returns its body as an object of the specified
type
 Can throw a MessageFormatRuntimeException if wrong class used
●
If AUTO_ACK, will be as if method never called
..else will be as if method failed, app must force rollback

WebSphere MQ
Message Body Conversions
Message Type Parameter
TextMessage String.class
ObjectMessage Java.io.Serializable
MapMessage Java.util.Map or java.lang.Object
BytesMessage byte[].class
Message Always returns null
<nobody> Always returns null

Message Body Conversions: MQ v8 Notes
 Applications needs to be careful how these are used, especially with Message
Consumers
 Consumers using receiveBody if AUTO_ACK or DUPS_OK needs lock
message on queue so unavailable to anybody else
– Message is locked on the queue using GMO_LOCK
– Body conversion is attempted
– Failure means message is unlocked – with the potential to be delivered again
– Success requires message to be removed from queue destructively
– Note this is NOT redelivery – messages are not marked as with a re-delivered
message
 Transactional receiveBody – gets message and then examines the message
body
–Failure of this is returned to application
–Application expected to rollback transaction
 Closing the session will close the open handle to the queue and the locks will be
released

WebSphere MQ
JMS 1.1 Interfaces Updates
[§6.1]
 Connections
–New methods for creating session with no transaction arguments
–Shared Connection Consumers
 Sessions
–Creating shared consumers
–Creating JMS1.1 MessageConsumer for durable subscriptions
 Message Producer
–New set/get for Delivery Delay
–Send methods extended to supply Completion Listener
 Message Consumer
–No change
 Message
–For delivery delay – getJMSDeliveryTime()
–New methods to directly access body data, getBody()
isBodyAssignableTo()

WebSphere MQ
Java 7 - Auto-Closeable
 Java 7 gives large variety of
–new functions – class libraries
–Java Language enhancements
–New class file version
 JMS2.0 drives Java 7 specifically because of the try-with-resources
enhancement

WebSphere MQ
Exceptions and Exception Listeners
[§10]
 New exception JMSRuntimeException thrown from new API calls
 JavaDoc shows mandatory cases
–...but... provider may thrown these for other cases as well
 Exceptions thrown on a JMS calls, must not be delivered to an
ExceptionListener
 Compiler will not force you to do error checking
 Must take responsibility for doing it at suitable points

New messaging features - recap
 Asynchronous Send
–Application sends messages via API that returns before server has
processed messages
–Confirmation via listener
 Delayed Delivery
–Allow delivery at a later point in time
–(remember this is not a database)
 Shared Subscriptions
–Subscription that can opened by multiple consumers concurrently
–Messages shared amongst consumers (no fairness rules provided)

WebSphere MQ
Subscriptions
[§8.3 §4.2]
 Unshared non-durable subscriptions
–As per JMS 1.1. non-durable subscription
 Shared non-durable subscription
–Identified by 'sharedSubscriptionName' and 'clientId' if set
–If clientId is set, all consumers must share the same clientId
–Subscription/undelivered messages deleted when last consumer is
closed
 Unshared Durable Subscriptions
–As per JMS 1.1 Durable subscriptions
 Shared Durable Subscriptions
–Has the features of a durable subscription but pulls in multiple
consumers aspect
–ClientId is optional
 Same 'sharedSubscriptionName' can be used for durable and non-
durable

WebSphere MQ
Asynchronous Send
[§7.3]
 Synchronous Send means
–Send message and wait for a response before returning from send call
 Asynchronous Send means
–Send message and return from the send call before response from
server
 Closing must wait for failure or completion of async sends
 Callbacks made in the same order the messages were sent
 Message objects not multi-threaded – don't modify until onCompletion
 CompletionListener called when response has been received.
–Does not work like message listener in terms of thread of control
 Quality of Service
–After onCompletion equal to sync send(...)

WebSphere MQ
Message Delivery Delay
[§7.9]
 Earliest Time JMS provider may give message to consumer
 Sets the minimum length of time (in ms) that must elapse after a message
is sent before the JMS provider may deliver the message to a consumer
 For transacted sends, this time starts when the client sends the message,
not when the transaction is committed.
 Delivery Delay set longer than expiry is an error!
–Will throw an exception

WebSphere MQ
Message Delivery Delay – MQ v8 Notes
[§7.9]
 Implemented using a single internal staging queue on the Qmgr
 Header added to messages placed on this queue.
 Qmgr component 'delayed delivery processor' monitors
–Delivery performed when delay completes
 Only available for use by JMS
 Queue is created by default on Distributed, needs creating manually on
zOS
 Full details at Knowledge Center topic 'q119200_'
http://www-01.ibm.com/support/knowledgecenter/api/content/SSFKSJ_8.0.0/com.ibm.mq.dev.doc/q119200_.htm

JMS and JavaEE
[§12 §13]
 JMS one of the constituent specifications of JavaEE
 JavaEE 7 brings in JMS 2.0
 ASF Mode still present – extended for Shared Subscriptions
 Context APIs also include XA variants
 MDB Activation Specifications main way of driving messages into JavaEE
 Strongly Recommended to provide a JCA Resource Adapter

WebSphere MQ
JMS and JavaEE – API updates
[§12 §13]
 Prescriptive list of APIs that can not be called in the containers
–No message listeners
–Single session / connection
–No connection consumers
–No Asynchronous Send
–Transaction control etc.
 Session/Context APIs - No local transactions or client acknowledgement
–javax.jms.Connection.createSession()
–javax.jms.ConnectionFactory.createContext()

WebSphere MQ
Resource Adapter
[§13]
 Specification assumption that one will be provided
 Two additional properties for an activation specification
 destinationLookup
–the JNDI name of javax.jms.Queue or javax.jms.Topic that defines the
JMS queue or topic for the MDB
 connectionFactoryLookup
–the JNDI name of javax.jms.ConnectionFactory, used to connect to the
JMS provider

MQ v8 Resource Adapter
 Resource Adapter is specifically for JavaEE 7 – therefore JCA 1.7
 Stand alone applications use JMS 2.0 JAR supplied with MQ
 JavaEE servers have their own – the RA doesn't have one...
 WMQ v8 Resource Adapter only deployed in JavaEE7
 WMQ Resource Adapters deployed in WAS 8.5.5/8.5/7 can connect to a WMQ v8
QueueManager in 'bindings' or 'client'

 WebSphere MQ resource adapter v8.0 statement of support
http://www-01.ibm.com/support/docview.wss?uid=swg27041968

Migration of applications
 JMS 2.0 supports all the JMS1.1 APIs
– The JMS2.0 version of the specification though defines the JMS1.1 usage
 Existing applications, without recompile, can run with a JMS2.0 implementation
 JMS1.1 apps, though, written against a JMS2.0 implement will not work against a JMS 1.1
implementation
– Existing interfaces reference some new JMS2.0 interfaces
 Note that the JVM for JMS2.0 implementations and Java7 runtime is needed
 Some API behavior changes...

JMS and the compliance test suite
 To ensure that the JMS provider has implemented the specification
correctly there is a compliance test suite that has to be run.
 This has been updated together with the JMS 2.0 specification
 To meet compliance with this new spec – some minor functional behavior
will change from previous implementations.
 'out of the box' MQ JMS needs to comply but old behavior can be
switched in.
–the property com.ibm.mq.jms.SupportMQExtensions, which can
be set to TRUE, to revert these changed behaviors back to previous
implementations.

SuportMQExtensions
 Three areas of functionality are reverted by setting SupportMQExtensions to True:
 Message priority
 Messages can be assigned a priority, 0 - 9. Before JMS 2.0, messages could also use the value -1,
indicating that a queue’s default priority is used. JMS 2.0 does not allow a message priority of -1 to be
set. Turning on SupportMQExtensions allows the value of -1 to be used.
 Client id
 The JMS 2.0 specification requires that non-null client ids are checked for uniqueness when they
make a connection. Turning on SupportMQExtensions, means that this requirement is disregarded,
and that a client id can be reused.
 NoLocal
 The JMS 2.0 specification requires that when this constant is turned on, a consumer cannot receive
messages that are published by the same client id. Before JMS 2.0, this attribute was set on a
subscriber to prevent it receiving messages that are published by its own connection. Turning on
SupportMQExtensions reverts this behavior to its previous implementation.

Provider Version
[http://www-01.ibm.com/support/knowledgecenter/api/content/SSFKSJ_8.0.0/com.ibm.mq.ref.dev.doc/q001850_copy1.htm]
 We've introduced a new property for the ProviderVersion field -
– This is for WebSphere MQ 'Normal Mode'.
– This is represented by a PROVIDERVERSION=8.
 This means that we need to connect to a QM that has a cmd level of 800 (WMQ v8). When this is
achieved you can use all the JMS 2.0 features.
 Connecting via 'Normal Mode with Restrictions'
– This is how PROVIDERVERSION=7 is defined
– This can connect to a queue manager with cmd level greater than 700
– You can use the JMS2.0 API but not Aysnc Send, Delayed Delivery or Shared Subs.
 Connecting via the 'Migration mode' means that everything is JMS1.1
–No matter the QM connected to
●
Leaving PROVIDERVERSION unset means
–'Normal Mode' is attempted first
–If the command level is less than 800 then 'Normal Mode with Restrictions' is used (established
hConn is re-used)
–If the command level is less than 700, the connection is closed and recreated with 'Migration
Mode'

ProviderVersion=8
CMDLvl=800
ProviderVersion=7
CMDLvl=700+

Error messages when using Provider Version
Error Code Message
JMSCC5007 Use of the JMS2.0 API ''{0}'' is not supported with this instance of
this connection
Only connections with a correct type of connection can support
using the JMS2.0 API
JMSCC5008 Use of the JMS2.0 Function ''{0}'' is not supported with this
instance of this connection
The use of the JMS2.0 functionality mentioned in the message is
only supported when connecting to a WebSphere MQ V8 queue
manager using WebSphere MQ messsaging provider V8 mode

37
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IBM technical publications: http://www.ibm.com/support/knowledgecenter. In IBM
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