The document discusses how to use a NOT filter in Mule applications. A NOT filter checks if an expression is false, and allows the message to pass through if it is false. An example flow is provided that uses a NOT filter to check if the payload contains "soft", and logs "Success" if it does not contain "soft". The flow demonstrates that the NOT filter inverts the logic of its nested expression filter.

1. NOT FILTER

2. Abstract
• The main motto of this PPT is How to use Not Filter in our
applications.

3. Introduction
• Mule bundles more than a dozen Filters that determine
whether a message can proceed through an application
flow. The simplest filters implement basic logic operators
(such as and, or, and not), but these simple elements
can be combined in various ways to specify complex
logical conditions.

4. Example

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="NotFilterFlow1" doc:name="NotFilterFlow1">
<http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8091"
path="NotFilter" doc:name="HTTP"/>
<logger message="----entered into the flow" level="INFO" doc:name="Logger"/>
<set-payload value="&lt;Soap-
Env&gt;&lt;Body&gt;&lt;Path&gt;mulechampions&lt;/Path&gt;&lt;/Body&gt;&lt;/Soap-Env&gt;" doc:name="Set
Payload"/>
<not-filter doc:name="Not">
<expression-filter expression="#[xpath('/Soap-Env/Body/Path/text()').text.contains('soft')]"/>
</not-filter>
<logger message="--Success" level="INFO" doc:name="Logger"/>
</flow>
</mule>

6. • Output:
INFO 2015-12-12 08:18:54,055 [[NotFilter].config.change.2.thread.1]
org.mule.DefaultMuleContext:
**********************************************************************
* Application: NotFilter *
* OS encoding: Cp1252, Mule encoding: UTF-8 *
* *
* Agents Running: *
* Clustering Agent *
* JMX Agent *
**********************************************************************
INFO 2015-12-12 08:18:54,056 [[NotFilter].config.change.2.thread.1]
org.mule.module.launcher.MuleDeploymentService:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Started app 'NotFilter' +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO 2015-12-12 08:19:05,212 [[NotFilter].connector.http.mule.default.receiver.02]
org.mule.api.processor.LoggerMessageProcessor: ----entered into the flow
INFO 2015-12-12 08:19:05,284 [[NotFilter].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:8091/NotFilter
2. NOT filter checks whether the request contains ‘soft’ or
not?, if no, it will print a message ‘Success’, else it will not
go further.

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