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JPA/Hibernate entities need to impose the correct NULL/NOT NULL constraints on the database - whatever these correct values actually are. API change: net.corda.core.schemas.PersistentStateRef fields (index and txId) are now non-nullable. Rationale: The fields were always effectively non-nullable - values were set from non-nullable fields of other objects. The class is used in context of database table Primary Key of for other entities and a database already imposes those columns as non-nullable (even if JPA annotation nullable=false was absent).
Corda
Corda is a decentralised database system in which nodes trust each other as little as possible.
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 Lists
- Documentation
- Stack Overflow Tag
- Slack Channel
- Meetups
- Training Courses
Contributing
We welcome contributions to Corda! Please see our CONTRIBUTING.md.
License
Acknowledgements
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