The document discusses reflection entry point resolvers in Mule Java custom components. A reflection entry point resolver determines the entry point of a component by invoking the appropriate class method based on the payload type. For multiple parameters, the payload should be an array of objects. If the payload is null, the resolver will invoke a no-argument method. The document provides examples of invoking methods with multiple arguments from an array payload, a single string argument from a string payload, and a no-argument method from a null payload using Java components in Mule.

1. MULE JAVA CUSTOM COMPONENT - 3
Ravinder

2. Reflection Entry Point Resolver:
 Reflection Entry Point Resolver is used to determine the entry
point of the component.
 Class method invocation happens based on the payload type as the
argument using reflection.
 For multiple parameters, the payload should be an Array of objects.
 If the payload is other than Array type then the respective method
which has same type of argument will be invoked.
 If the message payload is of type Null Payload the resolver will look
for a no-argument method.

3.  Below sub flow uses java components to implement Reflection Entry
Point Resolver
 Below java class "EntryPointResolver" has three methods with
different argument types.
 multipleArgumentsMethod
 singleArgumentMethod
 noArgumentsMethod(){

5.  Multiple Arguments method:
Drag an expression component and write code to create Array
(strArray) of two String objects. Store that Array object into payload.

6.  Drag a java component and refer to a class "EntryPointResolver".

7.  As the payload is Array of two objects after 'Expression'
component, "multipleArgumentsMethod(String name, String dept)"
method of "EntryPointResolver" Class gets invoked.
Single Argument method:
 Drag a 'Set Payload' component and set value a string value as
"RAM". Drag a java component and refer to a class
"EntryPointResolver" as shown earlier.
 As payload is String type after 'Set payload' component,
"singleArgumentMethod(String name)" method of
"EntryPointResolver" Class gets invoked.

9. Thank You All