将Spring Webflux应用程序作为WAR运行

Question

我有一个Spring反应示例应用程序，该应用程序是从Spring Webflux文档中提供的示例之一进行了修改的。该master应用程序的分支以传统方式使用Spring Boot，并带有嵌入式应用程序服务器（Netty）。一切正常。

在Liberty分支中，我试图将应用程序构建为WAR并部署到Websphere Liberty Profile。除了更改构建过程之外，最重要的代码更改是根据Webflux文档，将我的扩展Application.java（此处的源代码）扩展AbstractAnnotationConfigDispatcherHandlerInitializer：

对于Servlet容器（尤其是在WAR部署中），可以使用AbstractAnnotationConfigDispatcherHandlerInitializer作为WebApplicationInitializer，并由Servlet容器自动检测。如上所示，它负责注册ServletHttpHandlerAdapter。您将需要实现一种抽象方法以指向您的Spring配置。

但是，执行此操作时，不会映射任何资源/端点，Application.java也不会注册声明的bean 。这是我得到的完整输出，尝试访问上下文根目录时会抛出异常：

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)

我还尝试了部署到Tomcat 9，但遇到了同样的问题。我以前通过扩展SpringBootServletInitializer而不是，成功地将传统的Spring MVC应用程序部署为WAR AbstractAnnotationConfigDispatcherHandlerInitializer。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 5WebApplicationInitializer为基于 webflux 的应用程序带来了一些变体。

Spring 5.0.2之前（Spring Boot 2.0.0.M7与该版本对齐），有一个bug AbstractAnnotationConfigDispatcherHandlerInitializer，在5.0.2中，该类被标记为@Deprecated，有一个新AbstractReactiveWebInitializer引入。但这个类似乎也有问题，我必须重写createApplicationContext()才能使其工作。有关更多详细信息，请参阅我的示例AppInitializer中的注释。

检查我的可用战争样本，该样本已在 tomcat 上成功测试。