如何将 Spring-Boot-Webflux 应用程序部署到 Tomcat 独立服务器？

Question

一个普通的 spring-web 应用程序可以作为 war 文件独立部署到 tomcat，如下所示：

@SpringBootApplication
public class MyApplication extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(MyApplication.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

问题：迁移到 spring-webflux 到 tomcat 后如何部署这样的应用程序？

文档说： https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-httphandler

To deploy as a WAR to any Servlet 3.1+ container, you can extend and include AbstractReactiveWebInitializer in the WAR. That class wraps an HttpHandler with ServletHttpHandlerAdapter and registers that as a Servlet.

所以，但是没有示例如何。

我试过如下，出现异常：

@SpringBootApplication
public class MyApplication extends AbstractReactiveWebInitializer {

    @Override
    protected Class<?>[] getConfigClasses() {
        return new Class[] {MyApplication.class};
    }

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

结果：

MyApplication.java:13:8
java: cannot access javax.servlet.ServletException
  class file for javax.servlet.ServletException not found

Answer 1

您应该遵循 Spring Boot Guide on Traditional Deployment。这解释了您需要 spring-boot-starter-tomcat （因为这是您选择的服务器）所提供的范围。否则它可能会开始添加您不需要的其他 jar，这可能（并且可能会）干扰部署。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <scope>provided</scope>
</dependency>

您还可以运行生成的 WAR 文件作为常规应用程序。所以你可以构建 WAR 并只做 java -jar your.war 它就会开始。或者你可以只运行 @SpringBootApplication 注释 class （尽管根据我的经验，如果你使用 JSP 可能无法 100% 工作）。

Answer 2

Spring 引导团队不支持此用例，as explained in the reference documentation. Even if some features might work, you'll find many limitations and bugs to this approach - and it seems you've started to experience just this。

如何将 Spring-Boot-Webflux 应用程序部署到 Tomcat 独立服务器？

How to deploy a Spring-Boot-Webflux application to Tomcat standalone server?

java

spring

spring-boot

spring-webflux