Tells about Java in mule part 1

1. Vasanthii

2.  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