Platform Events Developer Guide

Platform Events Developer Guide
Delivering Custom Notifications with Platform Events
Defining Your Custom Platform Event
Publishing Platform Events
Subscribing to Platform Events
Testing Your Platform Event in Apex
Encrypting Platform Event Messages at Rest in the Event Bus
Monitor Platform Event Publishing and Delivery Usage
Considerations
Examples
End-to-End Example Using Flows
Java Client Examples
Java Client Example Using the Command Line
Prerequisites
Build and Run EMP Connector on the Command Line
Publish and Receive Platform Events
Java Client Example Using an IDE
Java Client Example Using Pub/Sub API
Platform Event Samples
Reference
PDF

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Example: Subscribe to Events Using a Java Client (EMP Connector) on the Command Line

Learn how to use the EMP Connector open-source tool on the command line. 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 platform event, 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 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.