Ndtyjky

In my spring boot 2.0 application, I have the main application listening on port 1234, I want to have the management server running on 1235.

So in my config file, I set:

management.server.port=1235

My server fails to start, with this error:

[ERROR] 2018-11-14 05:20:14.958 [main] SpringApplication - Application run failed
org.springframework.beans.FatalBeanException: ServletWebServerFactory implementation com.my.MyApplication$2 cannot be instantiated. To allow a separate management port to be used, a top-level class or static inner class should be used instead
at org.springframework.boot.actuate.autoconfigure.web.servlet.ServletManagementContextFactory.determineServletWebServerFactoryClass(ServletManagementContextFactory.java:77) ~[spring-boot-actuator-autoconfigure-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.boot.actuate.autoconfigure.web.servlet.ServletManagementContextFactory.registerServletWebServerFactory(ServletManagementContextFactory.java:64) ~[spring-boot-actuator-autoconfigure-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.boot.actuate.autoconfigure.web.servlet.ServletManagementContextFactory.createManagementContext(ServletManagementContextFactory.java:52) ~[spring-boot-actuator-autoconfigure-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.boot.actuate.autoconfigure.web.server.ManagementContextAutoConfiguration$DifferentManagementContextConfiguration.afterSingletonsInstantiated(ManagementContextAutoConfiguration.java:143) ~[spring-boot-actuator-autoconfigure-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:863) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) ~[spring-context-5.1.2.RELEASE.jar:5.1.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.2.RELEASE.jar:5.1.2.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE]
at com.my.MyApplication.main(EmsApplication.java:51) [main/:?]

If I remove this:

@Bean

public TomcatServletWebServerFactory containerFactory() {

    return new TomcatServletWebServerFactory() {

        @Override

        protected void customizeConnector(Connector connector) {

            int maxSize = 50000000;

            super.customizeConnector(connector);

            connector.setMaxPostSize(maxSize);

            connector.setMaxSavePostSize(maxSize);

            if (connector.getProtocolHandler() instanceof AbstractHttp11Protocol) {



                ((AbstractHttp11Protocol <?>) connector.getProtocolHandler()).setMaxSwallowSize(maxSize);

            }

        }

        t

    };



}

then it works.

How to solve this problem?

thanks!

Your TomcatWebServerFactory sub-class is an anonymous inner-class. It needs to be a static inner-class or a top-level class so that it can be instantiated:

@Bean

public TomcatServletWebServerFactory containerFactory() {

    return new CustomTomcatServletWebServerFactory();

}



static final class CustomTomcatServletWebServerFactory

        extends TomcatServletWebServerFactory {



    @Override

    protected void customizeConnector(Connector connector) {

        int maxSize = 50000000;

        super.customizeConnector(connector);

        connector.setMaxPostSize(maxSize);

        connector.setMaxSavePostSize(maxSize);

        if (connector.getProtocolHandler() instanceof AbstractHttp11Protocol) {

            ((AbstractHttp11Protocol<?>) connector.getProtocolHandler())

                    .setMaxSwallowSize(maxSize);

        }

    }



}

Alternatively, you could use a customizer instead of sub-classing TomcatServletWebServerFactory:

@Bean

public WebServerFactoryCustomizer<TomcatServletWebServerFactory> tomcatCustomizer() {

    return (tomcat) -> tomcat.addConnectorCustomizers((connector) -> {

        int maxSize = 50000000;

        connector.setMaxPostSize(maxSize);

        connector.setMaxSavePostSize(maxSize);

        if (connector.getProtocolHandler() instanceof AbstractHttp11Protocol) {



            ((AbstractHttp11Protocol<?>) connector.getProtocolHandler())

                    .setMaxSwallowSize(maxSize);

        }

    });

}