嵌入式码头：ServletContext的要求配置默认的servlet处理

Question

我试图安装一个弹簧启动的应用程序与嵌入式Jetty服务器。这台服务器应该运行一个小的webapp。但是，在开始时，我会在加载war文件之后发现以下异常。

跟踪

2016-10-02 16:07:59.302 ERROR 18765 --- [   main] o.s.boot.SpringApplication    : Application startup failed 

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultServletHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'defaultServletHandlerMapping' threw exception; nested exception is java.lang.IllegalArgumentException: A ServletContext is required to configure default servlet handling 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'defaultServletHandlerMapping' threw exception; nested exception is java.lang.IllegalArgumentException: A ServletContext is required to configure default servlet handling 
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    ... 24 common frames omitted 
Caused by: java.lang.IllegalArgumentException: A ServletContext is required to configure default servlet handling 
    at org.springframework.util.Assert.notNull(Assert.java:115) ~[spring-core-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer.<init>(DefaultServletHandlerConfigurer.java:53) ~[spring-webmvc-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.defaultServletHandlerMapping(WebMvcConfigurationSupport.java:451) ~[spring-webmvc-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$671a10db.CGLIB$defaultServletHandlerMapping$28(<generated>) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$671a10db$$FastClassBySpringCGLIB$$f33d99c3.invoke(<generated>) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration$$EnhancerBySpringCGLIB$$671a10db.defaultServletHandlerMapping(<generated>) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_111] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_111] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_111] 
    at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_111] 
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    ... 25 common frames omitted 

我已经下调代码到最低限度，仍然得到错误。

主要

@Configuration 
@ComponentScan 
@EnableAutoConfiguration 
public class ServerApplication { 

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

} 

配置

@Configuration 

@EnableAutoConfiguration 
public class JettyServerCustomizer implements EmbeddedServletContainerCustomizer { 

    @Override 
    public void customize(ConfigurableEmbeddedServletContainer container) { 
     if (container instanceof JettyEmbeddedServletContainerFactory) { 
      customizeJetty((JettyEmbeddedServletContainerFactory) container); 
     } 
    } 

    public void customizeJetty(
      JettyEmbeddedServletContainerFactory containerFactory) { 
     containerFactory.addServerCustomizers(jettyServerCustomizer()); 
    } 

    @Bean 
    public JettyServerCustomizer jettyServerCustomizer() { 
     return new JettyServerCustomizer() { 

      @Override 
      public void customize(Server server) { 
       String jetty_home = System.getProperty("jetty.home",".."); 
       WebAppContext webapp = new WebAppContext(); 
       webapp.setContextPath("/"); 
       webapp.setWar(jetty_home+"/webapps/sample.war"); 
       server.setHandler(webapp); 
      } 
     }; 
    } 
} 

有什么建议？谢谢！

更新

试图从Strelok我得到这个错误，而不是建议后。

2016-10-02 16:55:03.715 INFO 20025 --- [   main] org.eclipse.jetty.servlet.ServletHolder : unavailable 

java.lang.NullPointerException: null 
    at org.eclipse.jetty.servlet.ServletHolder.initMultiPart(ServletHolder.java:702) [jetty-servlet-9.2.16.v20160414.jar!/:9.2.16.v20160414] 
    at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:607) [jetty-servlet-9.2.16.v20160414.jar!/:9.2.16.v20160414] 
    at org.eclipse.jetty.servlet.ServletHolder.initialize(ServletHolder.java:396) [jetty-servlet-9.2.16.v20160414.jar!/:9.2.16.v20160414] 
    at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:871) [jetty-servlet-9.2.16.v20160414.jar!/:9.2.16.v20160414] 
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedWebAppContext$JettyEmbeddedServletHandler.deferredInitialize(JettyEmbeddedWebAppContext.java:46) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedWebAppContext.deferredInitialize(JettyEmbeddedWebAppContext.java:36) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainer.handleDeferredInitialize(JettyEmbeddedServletContainer.java:167) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainer.handleDeferredInitialize(JettyEmbeddedServletContainer.java:170) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainer.start(JettyEmbeddedServletContainer.java:114) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:293) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:141) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) [spring-context-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.5.RELEASE.jar!/:1.3.5.RELEASE] 

Answer 1

我认为你需要从服务器重用的处理程序：被启用由于WebMvc支持发生

return new JettyServerCustomizer() { 

     @Override 
     public void customize(Server server) { 
      String jetty_home = System.getProperty("jetty.home",".."); 
      WebAppContext webapp = new WebAppContext(); 
      webapp.setContextPath("/"); 
      webapp.setWar(jetty_home+"/webapps/sample.war"); 
      webapp.setHandler(server.getHandler()); 
      server.setHandler(webapp); 
     } 
    }; 

Answer 2

此错误。这可能由于包含@EnableWebMvc的配置类而发生，但也由于自动配置。尝试排除WebMvc自动配置。

@EnableAutoConfiguration(exclude = {WebMvcAutoConfiguration.class, WebMvcAutoConfiguration.EnableWebMvcConfiguration.class, WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter.class}) 

以我的情况下，我所需要的支持WebMvc，所以获得的访问哪些从WebMvcConfigurationSupport继承和与码头配置中设置的servlet上下文以固定的NPE类@Configuration。

@Bean 
public org.eclipse.jetty.webapp.Configuration jettyConfiguration() { 
    return new AbstractConfiguration() { 
     @Override 
     public void configure(WebAppContext context) throws Exception { 
      // This line fixes the error in my case 
      config.setServletContext(context.getServletContext()); 
     } 
    }; 
}