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Resolving the Only no-arg methods may be annotated with @Scheduled Error in Spring Boot

Learn how to address the common Spring Boot issue where only no-argument methods can be scheduled, ensuring your scheduled tasks run smoothly. --- This video is based on the question https://stackoverflow.com/q/70479794/ asked by the user 'Alexander' ( https://stackoverflow.com/u/15169462/ ) and on the answer https://stackoverflow.com/a/70481155/ provided by the user 'João Dias' ( https://stackoverflow.com/u/16572295/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Only no-arg methods may be annotated with -Scheduled Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Understanding the Only no-arg methods may be annotated with -Scheduled Error in Spring Boot Spring Boot has become a popular framework for building Java applications, particularly because of its powerful scheduling capabilities. However, developers often encounter a common error: Only no-arg methods may be annotated with -Scheduled. This error suggests that your scheduled methods need to be adjusted to comply with Spring's requirements. The Problem In your project, you are attempting to create scheduled tasks that both save data to a .xlsx file and send emails at scheduled intervals. However, you find yourself receiving errors when you try to use the -Scheduled annotation with methods that have parameters, specifically ApplicationArguments args. Example of the Issue Here’s a snippet of your original code: [[See Video to Reveal this Text or Code Snippet]] The method run() takes ApplicationArguments args as a parameter which is causing the error. This raises the question: How can you effectively schedule your methods? The Solution To resolve the error, you need to implement a few changes. First and foremost, it's crucial to understand that scheduled methods must not have any parameters. This means you have to remove ApplicationArguments args from any method annotated with -Scheduled. Here’s an organized step-by-step solution: Step 1: Separate the Tasks Keep the run() Method for Application Runner: This method should implement the ApplicationRunner interface. It will handle the initial data processing when the application starts. Create Distinct run Methods for Scheduling: For your scheduled tasks, create separate methods without any parameters. Step 2: Implement the Changes Here’s how your revised class might look: [[See Video to Reveal this Text or Code Snippet]] Key Changes Made Removed the ApplicationArguments args parameter from all methods annotated with -Scheduled. Created a new method scheduledRun() for the scheduled task that runs the saveCards() function. Segregated email-related logic into a separate method to maintain clarity. Conclusion By ensuring that your scheduled methods are parameter-free, you can eliminate the Only no-arg methods may be annotated with -Scheduled error in Spring Boot. This will not only enable your scheduled tasks to run without complications but also keep your code neat and manageable. Embrace the power of scheduling, and let Spring handle your background tasks efficiently! Keep exploring and coding to make the most of Spring Boot's capabilities!