SpringActuator使用SpringBoot回傳404（戰爭專案）

我正在使用帶有 Java 17 的 Spring Boot 2.7.0（但我也嘗試過 2.6.7 和 2.5），并且我想將執行器添加到專案中。該專案被打包為一個戰爭，因為它仍然使用 JSP，當我們將它打包為 jar 時，我們還沒有開始作業。由于兼容性問題，它使用了一個非常舊版本的 spring-security（4.2.18.RELEASE，仍然使用 XML 配置），但除此之外，依賴項應該是最新的。在其他專案中，我從來沒有遇到過執行器的任何問題。無論如何，我已將此添加到pom.xml檔案中：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

具有這些屬性：

management.server.port=8081
management.endpoint.health.enabled=true
management.endpoint.health.show-details=always
management.endpoint.health.status.http-mapping.DOWN=200
management.endpoints.web.exposure.include=*

我們已將此設定添加到我們的 spring security XML 配置中，以允許對執行器的所有呼叫：

<http pattern="/actuator/**" auto-config="true" use-expressions="true" create-session="stateless" disable-url-rewriting="true" security="none"/>

我們有（很多）自定義配置，但我能想到的相關部分是這樣定義的：

@EnableRabbit
@EnableRetry
@SpringBootApplication
@EnableAsync
@EnableAspectJAutoProxy(proxyTargetClass = true)
@ComponentScan({"com.company.something", "com.company.another"})
@ImportResource(locations = {"classpath*:META-INF/spring/applicationContext*.xml", "classpath:spring/webflow-config.xml"})
public class Bootstrap {

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

和

@Configuration
public class WebappConfiguration implements WebMvcConfigurer {

    @Bean
    public TomcatServletWebServerFactory tomcatFactory() {
        return new CustomTomcatServletWebServerFactory();
    }

    @Bean
    public WebServerFactoryCustomizer<TomcatServletWebServerFactory> servletContainerCustomizer() {
        return container -> {
            container.addContextCustomizers(ctx -> ctx.setReloadable(false));
            container.addConnectorCustomizers(con -> con.setMaxPostSize(5000000));
        };
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/web-resources/**").addResourceLocations("classpath:/META-INF/web-resources/");
    }


    @Bean
    public DispatcherServletRegistrationBean dispatcherServletRegistrationBean() {
        DispatcherServlet servlet = new DispatcherServlet();
        servlet.setApplicationContext(new AnnotationConfigWebApplicationContext());
        return new DispatcherServletRegistrationBean(servlet, "/");
    }

    private static class CustomTomcatServletWebServerFactory extends TomcatServletWebServerFactory {
        @Override
        protected void postProcessContext(Context context) {
            ((StandardJarScanner) context.getJarScanner()).setScanManifest(false);
            context.setResources(new ExtractingRoot());
        }
    }
}

當我運行應用程式時，我收到此錯誤：

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 2 of method servletEndpointRegistrar in org.springframework.boot.actuate.autoconfigure.endpoint.web.ServletEndpointManagementContextConfiguration$WebMvcServletEndpointManagementContextConfiguration required a single bean, but 2 were found:
    - dispatcherServletRegistration: a programmatically registered singleton    - dispatcherServletRegistrationBean: defined by method 'dispatcherServletRegistrationBean' in class path resource [com/company/WebappConfiguration.class]

這是我覺得很奇怪的第一件事。據我了解，Spring 似乎檢測到了兩個servletEndpointRegistrarbean。如果我嘗試洗掉dispatcherServletRegistrationBean我遇到此錯誤：

***************************
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.

如果我改為將@Primary注釋添加到dispatcherServletRegistrationBean：

@Primary
@Bean
public DispatcherServletRegistrationBean dispatcherServletRegistrationBean() {
    DispatcherServlet servlet = new DispatcherServlet();
    servlet.setApplicationContext(new AnnotationConfigWebApplicationContext());
    return new DispatcherServletRegistrationBean(servlet, "/");
}

該應用程式確實啟動了。但是，如果我導航到http://localhost:8081/actuator所有我得到的是：

<Map>
  <timestamp>2022-05-24T06:38:58.914 00:00</timestamp>
  <status>404</status>
  <error>Not Found</error>
  <message>No message available</message>
  <path>/actuator</path>
</Map>

這可能是什么原因，我該如何解決？

uj5u.com熱心網友回復：

我設法通過創建DispatchServlet一個單獨的 bean來解決這個問題DispatcherServletRegistrationBean：

@Bean(name = DispatcherServletAutoConfiguration.DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)
public DispatcherServlet dispatcherServlet() {
    DispatcherServlet servlet = new DispatcherServlet();
    servlet.setApplicationContext(new AnnotationConfigWebApplicationContext());
    return servlet;
}

@Bean(name = DispatcherServletAutoConfiguration.DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME)
public DispatcherServletRegistrationBean dispatcherServletRegistration(DispatcherServlet dispatcherServlet) {
    return new DispatcherServletRegistrationBean(dispatcherServlet, "/");
}

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