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Java SDK for CloudEvents API

License Maven Central Javadocs

A Java API for the CloudEvents specification

Look at for more documentation.


This SDK is considered work in progress. The community is working hard to bring you a new major version of the SDK with major enhancements both to APIs and to implementation.

If you want to know more about v1 of this SDK, check out the v1 readme

Stay tuned!

Supported features of the specification:

v0.3 v1.0
CloudEvents Core ✔️ ✔️
AMQP Protocol Binding
- Proton ✔️ ✔️
AVRO Event Format
HTTP Protocol Binding ✔️ ✔️
- Vert.x ✔️ ✔️
- Jakarta Restful WS ✔️ ✔️
- Basic ✔️ ✔️
JSON Event Format ✔️ ✔️
- Jackson ✔️ ✔️
Kafka Protocol Binding ✔️ ✔️
MQTT Protocol Binding
NATS Protocol Binding
Web hook


The CloudEvents specification is a vendor-neutral specification for defining the format of event data that is being exchanged between different cloud systems. The specification basically defines an abstract envelope for any event data payload, without knowing specific implementation details of the actual underlying event. The current version of the spec is at 1.0 and it describes a simple event format, which was demonstrated at KubeCon 2018 using different Serverless platforms, such as Apache Openwhisk.


Documentation is available at

Javadocs are available on

You can check out the examples in the examples directory.

Used By

Occurrent Knative Eventing


Each SDK may have its own unique processes, tooling and guidelines, common governance related material can be found in the CloudEvents community directory. In particular, in there you will find information concerning how SDK projects are managed, guidelines for how PR reviews and approval, and our Code of Conduct information.

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