Cookbooks

• Lab like activities + samples

Spring AOP

• 2 Ways

  • Dynamic Proxies

    • Natively supported by JVM

    • Only interface methods can be advised

    • Internal calls within a class call this and are not proxied/advised.

    • Arguments - * -> any type, .. -> any # of args of any type (0..n). i.e. int, ..

  • CGLib Target Class is extended via byte code injection to create a subclass

    • Slower (non-JVM native bytecode injection)

• REQUIRED - create a new TX or run within existing TX

• MANDATORY – run within an existing TX or throw an exception

Spring Web Frameworks

• getApplicationRequiredContext – Fails immediately if the application context has not been initialized properly.

Web Intro Lab

• Date formatting issue.

Spring @MVC

• DispatcherServletContext inherits from RootWebAppliactionContext (root application context).

• Do not <import/> the root application context into the child DispatcherServletContext , this would result in duplication of the RootWebAppliactionContext its inherited automatically.

DispatcherServletContext

RootWebAppliactionContext

Slide 38 -

@Controller is a subclass of @Component

so <context:component-scan base-package=”rewardsadmin”/>

using @Autowired and @RequestMapping you don't need to configure anything in spring application config..

Advanced Spring MVC – Slide 12

• Annotation + app-context scan is good for small applications

• XML for the controller class is good when application gets large and finding which class has the annotation for a mapping becomes difficult.

XML based config

• ControllerClassNameHandleMapping

  • .RewardsController -> maps url “/rewards*”

@InitBinder to do data validation

Spring Web Flow

• Spring IDE has a bug that displays errors on Spring Flow Definitions on some SWF files

• Conversation and Flow Scopes (flowExecutionKey=_conversation123_flow456)

  • flow scope – at each continuation in a conversation

  • conversation scope – available to all continuations within a conversation

  • a conversation is a flow entry point and set of continuations (subsequent back and forth requests)

• Flow Persistence

  • Continuation – in session

  • Conversation-based storage (1 state per flow, no per continuation scope)

  • Session Based – saves whole session to client side (no scope storage on server side)

  • Database not out of the box – but possibly useful to pass conversation to another user (i.e. Administrator) to complete flow

Spring Remoting

• org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter needs spring MVC as it is a @Controller

• What to use when -- see Slide 29

Spring Web Services

• Accept liberal inbound messages by querying for important data elements with with XPath

JMS

• DynamicResolution – resolve Queue by Queue or Topic name

• response-destination is a default, if there is a response destination in the message header that value will override the response queue.

• Spring JMS Listener is by default a thread-safe singleton

Tasks

• ThreadPoolTaskExecutor (JDK 5.0)

• Queue conflation -> not out of the box