问题

I'm trying to stand up an embedded Tomcat with spring-boot. I want to use CXF for a set of web services in the app but I can not figure out how to stand up the CXF servlet.

My Main class looks like this...

@Configuration
@EnableAutoConfiguration
@ComponentScan(basePackages={"com.connecture.services.documentservice.webservice"})
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(new Class[] { Application.class, CfxInitializer.class }, args);
    }

    @Bean
  public EmbeddedServletContainerFactory embeddedServletContainerFactory() {
      TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory("", 8080);
      return factory;
  }

}

And my CfxInitializer like this...

public class CfxInitializer implements ServletContextInitializer
{

  @Override
  public void onStartup(ServletContext servletContext) throws ServletException
  {
    XmlWebApplicationContext rootContext = new XmlWebApplicationContext();  
    rootContext.setConfigLocations(new String[] { "classpath*:applicationContext.xml" });  
    servletContext.addListener(new ContextLoaderListener(rootContext));  

    ServletRegistration.Dynamic dispatcher = servletContext.addServlet("CXFServlet", CXFServlet.class);  
    dispatcher.addMapping("/api/*");  
  }

}

When I try to build and start the jar with the typical command ./gradlew build && java -jar build/libs/gs-spring-boot-0.1.0.jar

I get an Exception for multiple Contexts.

Java.lang.IllegalStateException: Cannot initialize context because there is already a root application context present - check whether you have multiple ContextLoader* definitions in your web.xml!
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:277)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4971)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

Here is a more complete pastebin - http://pastebin.com/bcJ2ULhM

----------------------------------------------------------------------------------

Similarly to Dave's answer I was able to fix it by removing the ServletContextInitializer and adding a bean to the Application Class.

@Bean
  public ServletRegistrationBean servletRegistrationBean(){
      return new ServletRegistrationBean(new CXFServlet(),"/api/*");
  }

回答1:

The Spring Boot embedded servlet features are designed to work with Servlet and ServletRegistration @Beans, and not with the ContextLoaderListener (which looks like it is trying to steal the ServletContext attribute for the root context). Try adding a ServletRegistration for your servlet instead; if it is Spring aware, assuming it has an interface that lets you change the application context or the context location, then you should be able to configure it in the registration.