gRPC Support in Spring Boot 4.1: What You Need to Know

Spring Boot 4.1 was officially released on June 10, 2026. One of its most significant updates is the integration of gRPC support directly into the framework. This change is essential for developers working on service-to-service communication in microservices architecture. Let's explore what this means for you.

New Starters for gRPC

With Spring Boot 4.1, developers can now use new starters specifically designed for gRPC. These starters simplify the setup process. Here are the new starters you can use:

• org.springframework.boot:spring-boot-starter-grpc-server
• org.springframework.boot:spring-boot-starter-grpc-client
• org.springframework.boot:spring-boot-starter-grpc-server-test
• org.springframework.boot:spring-boot-starter-grpc-client-test

These replace the older spring-grpc starters, which are now deprecated. The spring-grpc project continues to exist, providing the programming model with annotations like @GrpcService and @ImportGrpcClients.

Property Renames

As part of the migration to Spring Boot 4.1, several configuration properties have been renamed. Here are some key changes:

• spring.grpc.client.channels.<name>.address is now spring.grpc.client.channel.<name>.target
• spring.grpc.client.channels.<name>.default-deadline is now spring.grpc.client.channel.<name>.default.deadline
• spring.grpc.server.keep-alive.* is now spring.grpc.server.keepalive.*
• spring.grpc.server.max-inbound-message-size is now spring.grpc.server.inbound.message.max-size
• spring.grpc.server.address (which included both host and port) is now split into spring.grpc.server.address (address only) and spring.grpc.server.port
• The health actuator properties have been removed; health is now configured under spring.grpc.server.health.*

These changes aim to provide a clearer and more consistent configuration experience.

Autoconfiguration Migration

The autoconfiguration for gRPC has been fully migrated to Spring Boot 4.1. This means that developers no longer need to manage separate configurations for gRPC. The migration is highlighted in the release notes for spring-grpc 1.1.0, which states:

"The main change in 1.1.0 is the migration of autoconfiguration to Spring Boot 4.1.0."

Performance Metrics

To understand the performance benefits of using gRPC in Spring Boot 4.1, a comparison was made between unary REST (using Spring MVC) and unary gRPC. The tests were conducted under the same conditions with a shared database. Here are the results:

• REST: 1,613 requests per second (req/s) with a median response time of 7.0 ms.
• gRPC: 1,926 req/s with a median response time of 7.9 ms.

This shows that gRPC offers about 19% more throughput compared to REST, along with lower latency.

Conclusion

The integration of gRPC into Spring Boot 4.1 makes it easier for developers to build efficient microservices. With new starters and simplified configuration, adopting gRPC is now more straightforward than ever.

Merits

• Simplified integration of gRPC into Spring Boot applications.
• Improved performance metrics compared to traditional REST.
• Clearer property naming and configuration structure.

Demerits

• Older spring-grpc starters are deprecated, which may require migration for existing projects.
• Some learning curve for developers unfamiliar with gRPC concepts.

Caution

This article is intended for educational purposes. Ensure you replace any placeholder values with your specific configurations, and verify all claims against the original source before relying on them.

Frequently asked questions

• What is gRPC? — gRPC is a modern open-source remote procedure call (RPC) framework that helps developers build efficient and scalable APIs.
• What are the benefits of using gRPC with Spring Boot? — gRPC offers improved performance, lower latency, and a more straightforward integration process in Spring Boot applications.
• How do I migrate to Spring Boot 4.1? — To migrate, update your dependencies to use the new gRPC starters and adjust your configuration properties as outlined in the migration guide.
• What is the difference between REST and gRPC? — REST uses standard HTTP methods and is text-based, while gRPC uses HTTP/2 for transport, making it more efficient for service-to-service communication.
• Can I still use the old spring-grpc starters? — While the old starters are deprecated, they are still available for projects pinned to Spring Boot 4.0. However, it's recommended to migrate to the new starters.
• Is there a performance benchmark for gRPC? — Yes, benchmarks show that gRPC can provide significantly higher throughput and lower latency compared to traditional REST APIs.

Tags

#springboot #grpc #java #microservices #programming #softwaredevelopment #webdevelopment #performance