below code should throw an exception

import jakarta.annotation.Nonnull;

public class test89 {
    public String processString(@Nonnull String input) {
        // Your method logic here
        return "Processed: " + input;
    }

    public static void main(String[] args) {
        test89 exampleService = new test89();
        String result = exampleService.processString(null);
        System.out.println(result);

        
    }
}

but giving output as

`
Processed: null

Process finished with exit code 0`

it should throw Exception