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Corda is an open source blockchain project, designed for business from the start. Only Corda allows you to build interoperable blockchain networks that transact in strict privacy. Corda's smart contract technology allows businesses to transact directly, with value.
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Major changes due to JDK 17: 1. JDK17 JCE Provider now has built-in support for eddsas, corda uses the bouncycastle (i2p) implementation. This PR removes the conflicting algorithms from the built-in JCE provider. 2. JavaScript scripting has been removed from the JDK, the corda log4j config was using scripting to conditionally output additional diagnostic info if the MDC was populated. This PR has removed the scripting. 3. The artifactory plug-ins used are now deprecated, this PR has removed them and uses the same code as Corda 5 for publishing to artifactory. 4. Javadoc generation has been modified to use the latest dokka plug-ins. 5. Gradle 7.6 has implemented an incredibly annoying change where transitive dependencies are not put on the compile classpath, so that they have to be explicitly added as dependencies to projects. 6. Mockito has been updated, which sadly meant that quite a few source files have to changes to use the new (org.mockito.kotlin) package name. This makes this PR appear much larger than it is. 7. A number of tests have been marked as ignored to get a green, broadly they fall into 3 classes. The first is related to crypto keypair tests, it appears some logic in the JDK prefers to use the SunJCE implementation and we prefer to use bouncycastle. I believe this issue can be fixed with better test setup. The second group is related to our use of a method called "uncheckedCast(..)", the purpose of this method was to get rid of the annoying unchecked cast compiler warning that would otherwise exist. It looks like the Kotlin 1.9 compiler type inference differs and at runtime sometimes the type it infers is "Void" which causes an exception at runtime. The simplest solution is to use an explicit cast instead of unchecked cast, Corda 5 have removed unchecked cast from their codebase. The third class are a number of ActiveMQ tests which appear to have a memory leak somewhere. |
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Corda
Corda is an open source blockchain project, designed for business from the start. Only Corda allows you to build interoperable blockchain networks that transact in strict privacy. Corda's smart contract technology allows businesses to transact directly, with value.
Architecture Evolution
The code present in this repository reflects the first version of the implementation of the Corda model for DLT technology. This first architecture version covers Corda versions 1 through 4 and continues to deliver on the promise of DLT for both the open source community and industry as a whole.
However, like all things, Corda must evolve to serve the more stringent needs of today. This is why the second (and current) version of the Corda Architecture can be found here and will form the basis of the Corda 5 release.
Features
- Smart contracts that can be written in Java and other JVM languages
- Flow framework to manage communication and negotiation between participants
- Peer-to-peer network of nodes
- "Notary" infrastructure to validate uniqueness and sequencing of transactions without global broadcast
- Enables the development and deployment of distributed apps called CorDapps
- Written in Kotlin, targeting the JVM
Getting started
- Read the Getting Started documentation
- Run the Example CorDapp
- Read about Corda's Key Concepts
- Follow the Hello, World! tutorial
Useful links
- Project Website
- Mailing List
- Documentation
- Stack Overflow Tag
- Slack Channel
- Meetups
- Training Courses
Contributing
Corda is an open-source project and contributions are welcome!
To find out how to contribute, please see our contributing docs.
License
Acknowledgements
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