Author: Neelam Deshmukh
1. Overview
As Mule is being built on top of Java and Spring, there is a strong integration capability in Mule to invoke Java methods. There are numerous ways to invoke a Java method in Mule.
From a DataWeave statement, you can call Java methods from any Java class that’s in your Mule project.
In this blog, we will learn an approach by using Java Component to call custom java class:
- Invokes a static method on a provided instance
- Instantiate Java class
- Invoke a non static method
2. Invoke a Java static method from a class
Step 1: Create a class as part of a Java package named “utils” in your Mule project’s src/main/java folder.
Step 2: Create a mule flow to call the method appendRandom() from Dataweave code
Step 3: Dataweave script to call appendRandom()
Step 4: Postman Console
3. Instantiate Java class
Step 1: Create a class as part of a Java package named “utils” in your Mule project’s src/main/java folder.
Step 2: Create a mule flow to call the method appendRandom() from Dataweave code
Step 3: Dataweave script to call appendRandom()
Step 4: Postman Console
4. Invoke a Java non static method from a class
Step 1: Create a class as part of a Java package named “utils” in your Mule project’s src/main/java folder.
Step 2: Create a mule flow to call a non-static function. We need to first create an instance of the class by using the “New” and “Invoke” java component from the mule palette.
Step 3: New and Invoke Java Components Configuration
Step 4: Postman Console
5. Conclusion
In this tutorial, we looked at approaches to call Java components in Mule 4.
