java - 作为 WAR 运行 Spring Webflux 应用程序

Question

我有一个 Spring 响应式 sample application这是从 Spring Webflux documentation 中提供的示例之一修改而来的.此应用程序的 master 分支以传统方式使用 Spring Boot，带有嵌入式应用程序服务器 (Netty)。它工作正常。

在Liberty branch ，我正在尝试将应用程序构建为 WAR 并部署到 Websphere Liberty Profile。除了对构建过程的更改之外，最重要的代码更改是让我的 Application.java(来源 here)扩展 AbstractAnnotationConfigDispatcherHandlerInitializer，根据 Webflux 文档:

For Servlet containers especially with WAR deployment you can use the AbstractAnnotationConfigDispatcherHandlerInitializer which as a WebApplicationInitializer and is auto-detected by Servlet containers. It takes care of registering the ServletHttpHandlerAdapter as shown above. You will need to implement one abstract method in order to point to your Spring configuration.

但是，当我这样做时，我的资源/端点都没有被映射，我在 Application.java 中声明的 bean 也没有被注册。这是我得到的完整输出，但在尝试访问上下文根时抛出异常:

13:29:48.848 [Default Executor-thread-6] DEBUG org.springframework.context.annotation.ClassPathBeanDefinitionScanner - JSR-250 'javax.annotation.ManagedBean' found and supported for component scanning
13:29:48.855 [Default Executor-thread-6] INFO org.springframework.context.annotation.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@4ba0f9a4: startup date [Fri Oct 13 13:29:48 CDT 2017]; root of context hierarchy
13:29:48.857 [Default Executor-thread-6] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Bean factory for org.springframework.context.annotation.AnnotationConfigApplicationContext@4ba0f9a4: org.springframework.beans.factory.support.DefaultListableBeanFactory@41daf3ea: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.event.internalEventListenerProcessor,org.springframework.context.event.internalEventListenerFactory]; root of factory hierarchy
13:29:48.907 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
13:29:48.907 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating instance of bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
13:29:48.939 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor' to allow for resolving potential circular references
13:29:48.943 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
13:29:49.371 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
13:29:49.371 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating instance of bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
13:29:49.372 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor' to allow for resolving potential circular references
13:29:49.425 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
13:29:49.426 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalRequiredAnnotationProcessor'
13:29:49.426 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating instance of bean 'org.springframework.context.annotation.internalRequiredAnnotationProcessor'
13:29:49.428 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'org.springframework.context.annotation.internalRequiredAnnotationProcessor' to allow for resolving potential circular references
13:29:49.432 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'org.springframework.context.annotation.internalRequiredAnnotationProcessor'
13:29:49.433 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
13:29:49.433 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating instance of bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
13:29:49.441 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor' to allow for resolving potential circular references
13:29:49.450 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
13:29:49.454 [Default Executor-thread-6] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Unable to locate MessageSource with name 'messageSource': using default [org.springframework.context.support.DelegatingMessageSource@5c88ddc5]
13:29:49.458 [Default Executor-thread-6] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Unable to locate ApplicationEventMulticaster with name 'applicationEventMulticaster': using default [org.springframework.context.event.SimpleApplicationEventMulticaster@6a00d295]
13:29:49.461 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@41daf3ea: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.event.internalEventListenerProcessor,org.springframework.context.event.internalEventListenerFactory]; root of factory hierarchy
13:29:49.462 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
13:29:49.462 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
13:29:49.462 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.context.annotation.internalRequiredAnnotationProcessor'
13:29:49.463 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
13:29:49.463 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'
13:29:49.463 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating instance of bean 'org.springframework.context.event.internalEventListenerProcessor'
13:29:49.477 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'org.springframework.context.event.internalEventListenerProcessor' to allow for resolving potential circular references
13:29:49.479 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'org.springframework.context.event.internalEventListenerProcessor'
13:29:49.480 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
13:29:49.480 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating instance of bean 'org.springframework.context.event.internalEventListenerFactory'
13:29:49.481 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'org.springframework.context.event.internalEventListenerFactory' to allow for resolving potential circular references
13:29:49.483 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'org.springframework.context.event.internalEventListenerFactory'
13:29:49.484 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
13:29:49.514 [Default Executor-thread-6] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Unable to locate LifecycleProcessor with name 'lifecycleProcessor': using default [org.springframework.context.support.DefaultLifecycleProcessor@6ffc157d]
13:29:49.515 [Default Executor-thread-6] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'lifecycleProcessor'
13:29:49.520 [Default Executor-thread-6] DEBUG org.springframework.core.env.PropertySourcesPropertyResolver - Could not find key 'spring.liveBeansView.mbeanDomain' in any property source
[AUDIT   ] CWWKZ0001I: Application spring-reactive-playground started in 3.480 seconds.
[AUDIT   ] CWWKF0012I: The server installed the following features: [servlet-3.1, websocket-1.1].
[AUDIT   ] CWWKF0011I: The server LibertyProjectServer is ready to run a smarter planet.
13:30:05.943 [Default Executor-thread-14] DEBUG reactor.util.Loggers$LoggerFactory - Using Slf4j logging framework
13:30:05.994 [Default Executor-thread-14] DEBUG org.springframework.web.reactive.DispatcherHandler - Processing GET request for [http://localhost:9080/]
13:30:06.041 [Default Executor-thread-14] ERROR org.springframework.web.server.adapter.HttpWebHandlerAdapter - Failed to handle request
org.springframework.web.server.ResponseStatusException: Response status 404 with reason "No matching handler"
        at org.springframework.web.reactive.DispatcherHandler.<clinit>(DispatcherHandler.java:74)
        at org.springframework.web.reactive.support.AbstractDispatcherHandlerInitializer.createDispatcherHandler(AbstractDispatcherHandlerInitializer.java:145)
        at org.springframework.web.reactive.support.AbstractDispatcherHandlerInitializer.registerDispatcherHandler(AbstractDispatcherHandlerInitializer.java:90)
        at org.springframework.web.reactive.support.AbstractDispatcherHandlerInitializer.onStartup(AbstractDispatcherHandlerInitializer.java:63)
        at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:172)
        at com.ibm.ws.webcontainer.webapp.WebApp.initializeServletContainerInitializers(WebApp.java:2539)
        at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:1055)
        at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:6595)
        at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApp(DynamicVirtualHost.java:468)
        at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApplication(DynamicVirtualHost.java:463)
        at com.ibm.ws.webcontainer.osgi.WebContainer.startWebApplication(WebContainer.java:1120)
        at com.ibm.ws.webcontainer.osgi.WebContainer.startModule(WebContainer.java:925)
        at com.ibm.ws.app.manager.module.internal.ModuleHandlerBase.deployModule(ModuleHandlerBase.java:100)
        at com.ibm.ws.app.manager.module.internal.DeployedModuleInfoImpl.installModule(DeployedModuleInfoImpl.java:50)
        at com.ibm.ws.app.manager.module.internal.DeployedAppInfoBase.deployModules(DeployedAppInfoBase.java:420)
        at com.ibm.ws.app.manager.module.internal.DeployedAppInfoBase.deployApp(DeployedAppInfoBase.java:406)
        at com.ibm.ws.app.manager.war.internal.WARApplicationHandlerImpl.install(WARApplicationHandlerImpl.java:66)
        at com.ibm.ws.app.manager.internal.statemachine.StartAction.execute(StartAction.java:141)
        at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.enterState(ApplicationStateMachineImpl.java:1259)
        at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.run(ApplicationStateMachineImpl.java:874)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:748)

我也尝试过部署到 Tomcat 9，但我遇到了同样的问题。我之前通过扩展 SpringBootServletInitializer 而不是 AbstractAnnotationConfigDispatcherHandlerInitializer 成功地将传统的 Spring MVC 应用程序部署为 WAR。 Spring Webflux 应用程序的等效过程是什么？我的项目代码中缺少什么？

Answer 1

Spring 5 为基于 webflux 的应用程序带来了 WebApplicationInitializer 的一些变体。

在Spring 5.0.2之前(Spring Boot 2.0.0.M7与该版本对齐)，AbstractAnnotationConfigDispatcherHandlerInitializer存在bug，在5.0.2中，该类标记为 @Deprecated，引入了一个新的AbstractReactiveWebInitializer。但是这个类似乎也有问题，我必须重写 createApplicationContext() 才能让它工作。请参阅我的示例中的评论 AppInitializer了解更多详情。

检查 my workable war sample在 tomcat 上测试成功。