Snippet

Enabling Virtual Threads for Scalable Blocking I/O

Leveraging Java 21+ Virtual Threads in Spring Boot 3.2+ allows the application to handle thousands of concurrent blocking connections without the memory overhead of platform threads, providing reactive-like scalability with imperative code.

snippet.java

java

@Configuration
@ConditionalOnThreading(Threading.VIRTUAL)
public class ThreadingConfig {
    @Bean
    public TomcatProtocolHandlerCustomizer<?> protocolHandlerCustomizer() {
        return protocolHandler -> {
            protocolHandler.setExecutor(Executors.newVirtualThreadPerTaskExecutor());
        };
    }
}
 
// application.properties
// spring.threads.virtual.enabled=true

spring

Breakdown

Executors.newVirtualThreadPerTaskExecutor()

Creates an executor that starts a new virtual thread for each submitted task.

protocolHandler.setExecutor(...)

Configures Tomcat to use virtual threads for processing incoming HTTP requests.

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Enabling Virtual Threads for Scalable Blocking I/O

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