Parameter 0 of method errorPageCustomizer in ErrorMvcAutoConfiguration 异常解决

Parameter 0 of method errorPageCustomizer in ErrorMvcAutoConfiguration required a bean of type 'xxx.DispatcherServletPath' that could not be found异常解决

一. 异常问题

我在利用Web Service进行RPC远程接口调用的时候，需要配置注册一个CXFServlet到web容器中，代码如下：

package com.yyg.boot.config;

import com.yyg.boot.service.MyService;
import com.yyg.boot.service.impl.MyServiceImpl;
import org.apache.cxf.Bus;
import org.apache.cxf.bus.spring.SpringBus;
import org.apache.cxf.jaxws.EndpointImpl;
import org.apache.cxf.transport.servlet.CXFServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.xml.ws.Endpoint;

/**
 * @Author 一一哥Sun
 * @Date Created in 2020/5/9
 * @Description Description
 */
@Configuration
public class CxfConfig {

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

    @Bean(name = Bus.DEFAULT_BUS_ID)
    public SpringBus springBus() {
        return new SpringBus();
    }

    @Bean
    public MyService myService() {
        return new MyServiceImpl();
    }

    @Bean
    public Endpoint endpoint() {
        EndpointImpl endpoint = new EndpointImpl(springBus(), myService());
        endpoint.publish("/api");
        return endpoint;
    }

}

结果产生了如下异常信息：

"C:\Program Files\Java\jdk1.8.0_192\bin\java.exe" -Dvisualvm.id=10230579134500 "-javaagent:E:\JetBrains\IntelliJ IDEA 2018.1.5\lib\idea_rt.jar=51229:E:\JetBrains\IntelliJ IDEA 2018.1.5\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program 
......
......

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.5.RELEASE)

......

***************************

APPLICATION FAILED TO START

***************************

Description:

Parameter 0 of method errorPageCustomizer in org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration required a bean of type 'org.springframework.boot.autoconfigure.web.servlet.DispatcherServletPath' that could not be found.

The following candidates were found but could not be injected:

 - Bean method 'dispatcherServletRegistration' in 'DispatcherServletAutoConfiguration.DispatcherServletRegistrationConfiguration' not loaded because DispatcherServlet Registration found non dispatcher servlet dispatcherServlet


Action:

Consider revisiting the entries above or defining a bean of type 'org.springframework.boot.autoconfigure.web.servlet.DispatcherServletPath' in your configuration.


Process finished with exit code 1

二. 原因分析

我们分析一下原因，其实从log信息中仔细看一下，会发现原因如下：

原因就是在DispatcherServlet Registration的注册中找不到需要用的dispatcherServlet!

按理说dispatcherServlet在SpringBoot中会默认创建并注册，这里怎么突然找不到了呢？之前都可以的！而这个错误是在我创建了这个配置类之后产生的，所以说嘛问题是我上面的代码造成的。

3. 问题解决

后来我仔细分析一下，原来是我的类中，默认的配置方法名有问题：

解决办法如下：

很简单，就是把方法名称换一下，随便换成别的名称即可。

package com.yyg.boot.config;

import com.yyg.boot.service.MyService;
import com.yyg.boot.service.impl.MyServiceImpl;
import org.apache.cxf.Bus;
import org.apache.cxf.bus.spring.SpringBus;
import org.apache.cxf.jaxws.EndpointImpl;
import org.apache.cxf.transport.servlet.CXFServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.xml.ws.Endpoint;

/**
 * @Author 一一哥Sun
 * @Date Created in 2020/5/9
 * @Description Description
 */
@Configuration
public class CxfConfig {

    //注意:该方法的名称不能使用dispatcherServlet(),否则会导致ErrorMvcAutoConfiguration错误.
    //org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration
    //required a bean of type 'org.springframework.boot.autoconfigure.web.servlet.DispatcherServletPath'
    // that could not be found.
//    @Bean
//    public ServletRegistrationBean dispatcherServlet() {
//        return new ServletRegistrationBean(new CXFServlet(), "/myService/*");
//    }

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

    @Bean(name = Bus.DEFAULT_BUS_ID)
    public SpringBus springBus() {
        return new SpringBus();
    }

    @Bean
    public MyService myService() {
        return new MyServiceImpl();
    }

    @Bean
    public Endpoint endpoint() {
        EndpointImpl endpoint = new EndpointImpl(springBus(), myService());
        endpoint.publish("/api");
        return endpoint;
    }

}