The document discusses using the Invoke component in Mule to call methods on Java classes. It describes creating a Java class with sample methods to greet users, then creating a Spring bean to reference that class. It also provides instructions on configuring the Invoke component to call the greetAll method, passing in message properties as arguments.

1. Invoke Component in Anypoint
Platform
By Srilatha Kante

2. Invoke Component
• The Invoke component invokes a method of
an object defined in a Spring bean. You can
provide an array of argument expressions to
map the message to the method arguments.
Mule determines which method to use via the
method name, along with the number of
argument expressions provided. Mule
automatically transforms the results of the
argument expressions to match the method
argument type, where possible.

3. Invoke Component
• Mule does not support multiple methods with
the same name and same number of
arguments.

4. Create Java Class
• Create a new Mule project.
Click File > New > Mule Project and name the
project demo.
• Create a new Java class. In Package Explorer,
right-click src/main/java and
click New > Package.
• Create a new Java class. In Package Explorer,
right-click src/main/java/com/mypackage and
click New > Class.

5. Java Class Implementation
• package com.mypackage;
• public class InvokeComponentDemo {
• public String greetMe(){
• return "Welcome to Mule Technologies!!";
• }
• public String greetAll(String me, String myfriend){
• return "Welcome to " +me + " and " +myfriend;
• }
• }

6. Start..
• In the package explorer right click on your
project and select New > Class
• Name your class, and make the
package org.mule.transformers
• You can use the basic class as a skeleton to
construct a simple Java Component:

7. Java Class Sample
• package com.mypackage;
• public class JavaComponentDemo {
• public String greetMe(String name){
• return name;
• }
• }

8. Mule Flow

9. Creating Spring Bean
• In Anypoint Studio, click Global Element at the
bottom of the Canvas.
• In the Global Mule Configuration Elements
screen, click Create.
• In the Choose Global Type screen, expand
Beans, select Bean, and click OK.
• In the Global Element Properties menu, enter
the class name.

10. Invoke Configurations
• In Invoke Configurations Add
• Set Object Ref to the object containing the
method to be invoked, in this
case, InvokeComponentDemo.
• Set Method to the method to invoke, in this
case, greetAll.
• Set Method
Arguments to #[message.inboundProperties.'http
.query.params'.name],
#[message.inboundProperties.'http.query.params
'.friend].