APR on Spring Boot

AprConfiguration.java

import org.apache.catalina.LifecycleListener;
import org.apache.catalina.core.AprLifecycleListener;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * NOTE: You also need to install APR on your system, on Arch Linux the package is called `tomcat-native`.
 */
@Configuration
public class AprConfiguration {
    @Value("${server.tomcat.apr.enabled:false}")
    private boolean enabled;

    @Bean
    public EmbeddedServletContainerFactory servletContainer() {
        TomcatEmbeddedServletContainerFactory container = new TomcatEmbeddedServletContainerFactory();
        if (enabled) {
            LifecycleListener arpLifecycle = new AprLifecycleListener();
            container.setProtocol("org.apache.coyote.http11.Http11AprProtocol");
            container.addContextLifecycleListeners(arpLifecycle);
        }

        return container;
    }
}

@metrue, it's been a while since I wrote that and didn't have to worry about APR since then. That code was written for Spring Boot 1.4.1 (Tomcat 8.x), probably you need to use a different protocol class or this approach doesn't work anymore for Spring Boot 2.x (Tomcat 9.x).

Consider to use: https://dirask.com/posts/Spring-Boot-2-example-APR-native-library-configuration-with-Tomcat-9-Http11AprProtocol-pq6xxj