Скачать или смотреть How to Update States and Contracts of a Corda Network Without Redeploying Nodes

Learn how to efficiently update states and contracts in your Corda network without the need for redeploying nodes. This guide provides a step-by-step approach for beginners.
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This video is based on the question https://stackoverflow.com/q/64501253/ asked by the user 'Vishwa Dayal' ( https://stackoverflow.com/u/10214245/ ) and on the answer https://stackoverflow.com/a/64501366/ provided by the user 'Adel Rustum' ( https://stackoverflow.com/u/11809424/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Updating States and Contracts in a Corda Network - A Beginner's Guide

As you embark on your journey with Corda and blockchain technology, one particular challenge you may encounter is the need to update the states or contracts while developing your Corda applications (Corda apps). If you're like many beginners, you might find yourself wondering how to make these changes without losing valuable data and having to redeploy your entire network of nodes. Let's dive into this problem and explore a practical solution.

The Challenge: Redeploying Nodes

When developing on Corda, every time you make even the slightest modification to your state or contract code, the common practice is to redeploy the nodes. However, this comes with the significant downside of deleting any existing data stored on those nodes. This can be incredibly inconvenient and time-consuming, especially during the development phase when you might be making multiple changes daily.

The Solution: Update Without Redeploying Nodes

Fortunately, there’s a more efficient way to update your Corda nodes without the hassle of a full deployment. Follow these simple steps to rebuild specific modules and refresh your contracts while retaining your node data.

Steps to Update Your Corda Contracts

Rebuild the Specific Module:

Navigate to your terminal or command prompt.

Use the following command to rebuild the contracts module:

[[See Video to Reveal this Text or Code Snippet]]

Locate the Updated Jar File:

After rebuilding, the updated jar file will be found in the build directory of your contracts module.

This file contains all the necessary changes and is what will be used to update your nodes.

Copy the Jar File to Node's Cordapps Folder:

Locate the cordapps folder in your node's directory.

Simply drag and drop (or copy) the newly built jar file from the build directory into the cordapps directory of your node.

Restart the Node:

Finally, restart your Corda node.

On restart, the node will pick up the new version of your contract and state code without losing any of your existing data.

Advantages of This Approach

Data Preservation: You avoid losing your existing node data.

Time Efficient: Only the affected module is rebuilt, leading to faster updates.

Simplified Development: Encourages a smoother development cycle as changes can be tested quickly without extensive redeployment processes.

Conclusion

Updating states and contracts in a Corda network doesn’t have to be a cumbersome task. By following the steps outlined above, you can efficiently manage changes to your Corda application without unnecessary data loss. This will help enhance your development workflow and allow you to focus on building your project. Embrace the power of Corda while keeping your data safe and secure!

By mastering these practices, not only do you elevate your skills as a Corda developer, but you also make your applications more robust and user-friendly. Happy coding!