This document discusses how to use message properties in Mule applications. It provides an example Mule flow that demonstrates setting message properties with different scopes and logging their values. The flow shows setting a session property in one flow and an outbound property, then accessing them as an inbound property in a second flow to illustrate how message properties work across flows.

1. How to use Message Properties
component
28-09-2014

2. Abstract
• The main motto of this PPT is how to use
Message Properties in our applications.

3. Example

4. • .mflow
• <?xml version="1.0" encoding="UTF-8"?>
• <mule xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:vm="http://www.mulesoft.org/schema/mule/vm"
xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans" version="EE-3.4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
• http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
• http://www.mulesoft.org/schema/mule/vm http://www.mulesoft.org/schema/mule/vm/current/mule-vm.xsd
• http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd">
• <flow name="MessagePropertiesFlow1" doc:name="MessagePropertiesFlow1">
• <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8089" path="messageproperties" doc:name="HTTP"/>
• <message-properties-transformer scope="session" doc:name="Message Properties">
• <add-message-property key="property1" value="studio"/>
• </message-properties-transformer>
• <message-properties-transformer scope="outbound" doc:name="Message Properties">
• <add-message-property key="property2" value="mule"/>
• </message-properties-transformer>
• <logger message="--flow1--#[message.outboundProperties['property2']]--#[sessionVars['property1']]" level="INFO" doc:name="Logger"/>
• <vm:outbound-endpoint exchange-pattern="request-response" path="messageproperties" doc:name="VM"/>
• </flow>
• <flow name="MessagePropertiesFlow2" doc:name="MessagePropertiesFlow2">
• <vm:inbound-endpoint exchange-pattern="request-response" path="messageproperties" doc:name="VM"/>
• <logger message="---flow2--#[message.inboundProperties['property2']]--#[sessionVars['property1']]" level="INFO" doc:name="Logger"/>
• </flow>
• </mule>

5. • Output:
• INFO 2015-10-03 16:00:23,705 [[messageproperties].config.change.14.thread.1] org.mule.DefaultMuleContext:
• **********************************************************************
• * Application: messageproperties *
• * OS encoding: Cp1252, Mule encoding: UTF-8 *
• * *
• * Agents Running: *
• * Clustering Agent *
• * JMX Agent *
• **********************************************************************
• INFO 2015-10-03 16:00:23,706 [[messageproperties].config.change.14.thread.1]
org.mule.module.launcher.MuleDeploymentService:
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• + Started app 'messageproperties' +
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• INFO 2015-10-03 16:00:26,480 [[messageproperties].connector.http.mule.default.receiver.02]
org.mule.api.processor.LoggerMessageProcessor: --flow1--mule--studio
• INFO 2015-10-03 16:00:26,482 [[messageproperties].connector.http.mule.default.receiver.02]
org.mule.lifecycle.AbstractLifecycleManager: Initialising: 'connector.VM.mule.default.dispatcher.771015974'.
Object is: VMMessageDispatcher
• INFO 2015-10-03 16:00:26,482 [[messageproperties].connector.http.mule.default.receiver.02]
org.mule.lifecycle.AbstractLifecycleManager: Starting: 'connector.VM.mule.default.dispatcher.771015974'. Object
is: VMMessageDispatcher
• INFO 2015-10-03 16:00:26,489 [[messageproperties].connector.http.mule.default.receiver.02]
org.mule.api.processor.LoggerMessageProcessor: ---flow2--mule--studio

6. • Flow of execution:
1. URL to trigger the service from browser
http://localhost:8089/messageproperties
2. In flow1 both outbound and session property
is created using message property component
3. Service displays both outbound and session
properties in flow1
4. In flow2 the outbound property is changes to
inbound proeprty
5. Flow2 displays both inbound and session
property

7. References
• http://www.mulesoft.org/documentation-
3.2/display/32X/Message+Property+Scopes