This document discusses various ways to access properties and methods in Mule using MEL (Mule Expression Language). It covers accessing object level properties, method level properties, operators, data extraction using XPath and regex, and lists/maps in MEL. Examples are provided for accessing properties from the message payload if it is a Java object, triggering methods on the payload, string concatenation operators, and comparison operators.

1. Abhishek Jain

2.  Use of MEL
 Access Object Level Properties
 Access Method Level Properties
 Operators
 Operators Evaluation
 Data Extraction
 Topic for next session
 Reference

4. -In the previous slide example, MEL is calling the inbound
property from the mule message for the value of “Host”
-All properties are stored in Map
-There are two ways to access them
-#[message.getInboundProperty(‘host’)]
-#[message.InboundProperties[‘host’]]
-In order to access Mule Registry, use below expression

5. If payload is of type java object
then properties can be accessed
directly by calling the fieldname
from payload.
For example, payload is of
CustomerDetails object and want to
access lastname then use the
below expression
#[payload.lastName]

6. If payload is of type java object
then methods can also be triggered
using MEL
For example, payload is of
CustomerDetails object and want to
trigger getFirstName method then
use below expressiono
#[payload.getFirstName()]

7. #[‘hello’ + ‘John’] => Hello John

8. Standard Comparison Operators:
==, !=, >, <, >=, =<
Contains – Similar to like Operator
Is- Checks the type of an object
Mainly used in Choice Router

9.  #[xpath(‘expression’)]
 #[regex(‘expression’)]

10. List/Maps in MEL

11.  www.mulesoft.com
 Mule in Action