MuleSoft Java Module provides a set of operations which can be used to invoke methods from Java Classes in a very efficient and convenient manner.
In this MuleSoft Java Module Tutorial, we will cover all available operations of this Java Module and you will learn how to invoke Static or Non-Static methods from a custom Java Class and also how to instantiate a class using New operation. You will also learn how to validate type of a class instance using Validate Type operation from Java Module.
An Overview of Mule 4 Java Module
Before we jump to the demo of MuleSoft Java Module available for Mule 4, it is important to have a high level overview of the module to better understand the concepts and use-cases.
Java Module provides operations to integrate with existing Java Classes by enabling your message flows to invoke static or non-static Java Methods from java classes. This module makes it easier to utilize existing java code for your integration flows.
There can be a number of use-cases where Java Module of Mule 4 can be considered and can serve your requirements. E.g. if you have a large number of existing java classes in a legacy system or you have a team of Java Developers working in parallel to implement some use-cases; you can simply utilize the available code by hooking that code in your AnyPoint Studio based message flows by using Java Module.
Also, if you have some specific requirements which can’t be handled by any of the existing connectors or modules, you can think of implementing that in your custom java code and then get that integrated with your message flows using Java Module operations. E.g. if you have to use certain Java Libraries like awt for graphics, it is much convenient to implement your logic in standard Java and then utilize it in your Mule Flows using Java Module.
There can be many other usage scenarios depending on your project’s nature and requirements where use of Java Module can be vital.
MuleSoft Java Module Operations
Java Module provides following operations in its current version (1.2) :
- Invoke Static
This operation of Java Module is used to invoke static methods from a Java Class.
- New
This operation of Java Module is used to create instance of a class. It creates an instance which can be subsequently used to invoke non-static methods of the class.
- Invoke
This operation of Java Module is used to invoke methods of a class based on class instance. New operation must be used first to generate the instance and then Invoke can be used.
- Validate Type
This operation can be used to validate type of an instance. It validates that provided instance and class in the configuration match or not. If they don’t match it throws JAVA:WRONG_INSTANCE_CLASS error type.
Mule 4 Java Module Demo
Now that you have a good understanding of the Java Module available in MuleSoft, watch below video on TutorialsPedia YouTube channel which covers and demonstrates all operations of Java Module.
Feel free to comment below if you have any questions. Refer to Mule 4 Tutorials for more where I have covered various topics about Mule 4 ESB.
