Platform Events Developer Guide

Platform Events Developer Guide
Delivering Custom Notifications with Platform Events
Defining Your Platform Event
Publishing Platform Events
Subscribing to Platform Events
Testing Your Platform Event in Apex
Considerations
Examples
End-to-End Example Using a Process and a Flow
Java Client Example
Prerequisites
Define a Platform Event
Download and Build the Project
Subscribe to a Channel and Receive Event Notifications
Platform Event Samples
Reference
PDF

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Example: Subscribe to and Replay Events Using a Java Client

The Java sample uses a library called Enterprise Messaging Platform (EMP) Connector. EMP Connector is a thin wrapper around the CometD library. It hides the complexity of creating a CometD client and subscribing to Streaming API in Java. The example subscribes to a channel, receives notifications, and supports replaying events with durable streaming.

EMP Connector is a free, open-source, community-supported tool. Salesforce provides this tool as an example of how to subscribe to events using CometD. To contribute to the EMP Connector project with your own enhancements, submit pull requests to the repository at https://github.com/forcedotcom/EMP-Connector.

Important

EMP Connector is based on Java 8 and uses CometD version 3.1.0. It supports username and password authentication and OAuth bearer token authentication. This walkthrough shows steps only for username and password authentication.