This document discusses using an expression filter in Mule applications. It provides an example XML configuration of a flow that uses an expression filter to check if the payload is not equal to "Hello", and logs a success message if it passes the filter. The output of running the flow is also shown. It concludes by explaining that the expression filter checks if the payload is not equal to "Hello", and if so, allows the message to pass through and logs success.

2.  The main motto of this PPT is How to use
Expression Filter in our applications.

3.  Expression Filter filters against a range of
expressions.

5. .mflow
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:http="http://www.mulesoft.org/schema/mule/http"
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/http http://www.mulesoft.org/schema/mule/http/current/mule-
http.xsd">
<flow name="ExpressionFilterFlow1" doc:name="ExpressionFilterFlow1">
<http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8093"
path="ExpressionFilter" doc:name="HTTP"/>
<logger message="--Entered into the flow" level="INFO" doc:name="Logger"/>
<set-payload value="Hello World" doc:name="Set Payload"/>
<expression-filter expression="#[message.payload != 'Hello']" doc:name="Expression"/>
<logger message="--Success" level="INFO" doc:name="Logger"/>
</flow>
</mule>

6.  Output:
INFO 2015-12-13 10:08:59,848 [[ExpressionFilter].config.change.2.thread.1]
org.mule.DefaultMuleContext:
**********************************************************************
* Application: ExpressionFilter *
* OS encoding: Cp1252, Mule encoding: UTF-8 *
* *
* Agents Running: *
* Clustering Agent *
* JMX Agent *
**********************************************************************
INFO 2015-12-13 10:08:59,849 [[ExpressionFilter].config.change.2.thread.1]
org.mule.module.launcher.MuleDeploymentService:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Started app 'ExpressionFilter' +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO 2015-12-13 10:09:04,493 [[ExpressionFilter].connector.http.mule.default.receiver.02]
org.mule.api.processor.LoggerMessageProcessor: --Entered into the flow
INFO 2015-12-13 10:09:04,507 [[ExpressionFilter].connector.http.mule.default.receiver.02]
org.mule.api.processor.LoggerMessageProcessor: --Success

7.  Flow of execution:
1. URL to trigger the service from browser
http://localhost:8093/ExpressionFilter
2. Expression filter checks whether the given
payload not equal to ‘Hello’ or not?, if yes, it will
print a message ‘Success’, else it will not go
further.

8.  https://docs.mulesoft.com/mule-user-
guide/v/3.7/filters