This document discusses different types of Java custom components in Mule, including Java components, Java components with singletons, invoke components, and calling a service using Java components. It provides examples of using a simple Java component to set a payload and print properties, and using a Java component with a singleton to share an object instance across requests. The main flow exposes an HTTP service and refers to subflows covering these Java component concepts.

1. Mule Java Custom
Component - 1
GSN-K

2. Java CustomComponent
• Java components are used write our custom code and custom
transformation. java transformers will be used when we cannot transform
a message using available Mule transformers. In this example, following
components are explained.
• Java Component
• Java component with singleton
• Invoke Component
• Java Transformer

3. • Reflection Entry Point Resolver
• Annotated Entry Point Resolver
• Invoking a service using java component
Below is the main flow which exposes a HTTP service and refers to
multiple sub flows one after another to cover all above concepts.

4. Java Component:
Java component is used to refer a class which has complex code.
Example:
Below is sub flow named 'simple-java-component' which has Set
Payload and java component.
'Set Payload' component sets payload as "Custom Payload".

5. • Java component is reffered to custom made class (UsingCallable)
which implements Callable interface. This class is used to print current
payload, size of inbound properties and size of invocation properties.

6. Above class implements Callable interface. it has onCall(MuleEventContext
eventContext) overriden method. This method provides MuleEventContext .
We can get all the data using MuleContext instace as shown in above code
snippet.Data-Mapper.

7. Java Component with Singleton:
The singleton object factory does not create a new instance for each request;
instead, the instance is shared.
Example:
Drag java component and double click on the java component to bring
up properties.
Click "+" symbol next to the 'Object' field
Select “core:singleton-object” and click "next".

8. Click on "..." button and select class
"com.techm.javacustomcomponents.UsingSingletonObject"

9. •Thank You All