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The message is visible as it travels through the flow and changes are made to it. Headers and other properties of the message are also visible. The Environment tree and the Exceptionlist tree are also visible. In order to check certain conditions in the message flow, values in the message can be manipulated in-flight through the debugger. The debugger can attach to a running execution group without a need to redeploy a debug version of the code. 3.4 New nodes A variety of new nodes have been provided to enhance the functionality of WebSphere Message Broker. Table 3-1 contains a list of new nodes after WebSphere MQ Integrator V2.1. A brief description of the functionality of each node is shown. Table 3-1 New nodes since WebSphere MQ Integrator V2.1 Node name MQGet MQOptimized node Description Can be used anywhere in a flow to retrieve a message from a WebSphere MQ queue. Is used to publish a persistent JMS message to a single subscriber to improve performance over ordinary publish/subscribe message flows. Used to receive a Web Services request. Must be used in conjunction with a HTTPReply node. Returns a response from a message flow to a Web Services client. This node constructs a Web Service request using the contents of an input message. The response is parsed for inclusion in the output tree. Receives messages from JMS destinations accessed through a connection to a JMS provider. Sends messages to JMS destinations using the Java Message Service Specification. Transforms a message with a JMS message tree into a message compatible with a WebSphere MQ JMS provider. HTTPInput HTTPReply HTTPRequest JMSInput JMSOutput JMS MQTransform Chapter 3. What is new for WebSphere MQ Integrator V2.1 users 39