How do I configure this property with Spring Boot and an embedded Tomcat?

Question

Do I configure properties like the connectionTimeout in the application.properties file or is the somewhere else to do it? I can\'t figure this out from Google.

Tomc

Answer 1

Spring Boot 1.4 and later

As of Spring Boot 1.4 you can use the property server.connection-timeout. See Spring Boot's common application properties.

Spring Boot 1.3 and earlier

Provide a customized EmbeddedServletContainerFactory bean:

@Bean
public EmbeddedServletContainerFactory servletContainerFactory() {
    TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory();

    factory.addConnectorCustomizers(connector -> 
            ((AbstractProtocol) connector.getProtocolHandler()).setConnectionTimeout(10000));

    // configure some more properties

    return factory;
}

If you are not using Java 8 or don't want to use Lambda Expressions, add the TomcatConnectorCustomizer like this:

    factory.addConnectorCustomizers(new TomcatConnectorCustomizer() {
        @Override
        public void customize(Connector connector) {
            ((AbstractProtocol) connector.getProtocolHandler()).setConnectionTimeout(10000);
        }
    });

The setConnectionTimeout() method expects the timeout in milliseconds (see connectionTimeout in Apache Tomcat 8 Configuration Reference).

Answer 2

After spring boot 2.x and later, the implement method of the embeding tomcat has been changed.

refer to the code below.

import org.apache.coyote.http11.AbstractHttp11Protocol;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.context.annotation.Configuration;

import lombok.extern.slf4j.Slf4j;

@Slf4j
@Configuration
public class TomcatCustomizer implements WebServerFactoryCustomizer<TomcatServletWebServerFactory> {

    @Autowired
    private ContainerProperties containerProperties;

    @Override
    public void customize(TomcatServletWebServerFactory factory) {
        factory.addConnectorCustomizers(connector -> {
            AbstractHttp11Protocol protocol = (AbstractHttp11Protocol) connector.getProtocolHandler();

            protocol.setMaxKeepAliveRequests(10);


            log.info("####################################################################################");
            log.info("#");
            log.info("# TomcatCustomizer");
            log.info("#");
            log.info("# custom maxKeepAliveRequests {}", protocol.getMaxKeepAliveRequests());
            log.info("# origin keepalive timeout: {} ms", protocol.getKeepAliveTimeout());
            log.info("# keepalive timeout: {} ms", protocol.getKeepAliveTimeout());
            log.info("# connection timeout: {} ms", protocol.getConnectionTimeout());
            log.info("# max connections: {}", protocol.getMaxConnections());
            log.info("#");
            log.info(
                "####################################################################################");

        });
    }
}

Answer 3

It's actually supposed to be server.connection-timeout in your application.properties. Reference, I suggest you bookmark it.

Answer 4

I prefer set of system properties before the server start:

/**
 * Start SpringBoot server
 */
@SpringBootApplication(scanBasePackages= {"com.your.conf.package"})
//@ComponentScan(basePackages = "com.your.conf.package")
public class Application {
    public static void main(String[] args) throws Exception {
        System.setProperty("server.port","8132"));
        System.setProperty("server.tomcat.max-threads","200");
        System.setProperty("server.connection-timeout","60000");
        ApplicationContext ctx = SpringApplication.run(Application.class, args);
    }
}