java - Spring Controller 不支持ServerHttpRequest

Question

我在 Rest Controller 中使用 ServerHttpRequest 作为请求参数。但在响应中我收到错误“找不到接口(interface) org.springframework.http.server.reactive.ServerHttpRequest 的主要或默认构造函数”。

我找到了一个类似的question ，但没有运气。

休息 Controller

@GetMapping(path = "/**")public Mono <ResponseEntity< String>> clientRequests(ServerHttpRequest request) {    Mono<ResponseEntity<String>> jsonOp =  restServices.getApiResponse();    return jsonOp;}

日志

SEVERE: Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: No primary or default constructor found for interface org.springframework.http.server.reactive.ServerHttpRequest] with root causejava.lang.NoSuchMethodException: org.springframework.http.server.reactive.ServerHttpRequest.()    at java.lang.Class.getConstructor0(Class.java:3082)    at java.lang.Class.getDeclaredConstructor(Class.java:2178)    at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:216)    at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:84)    at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:139)    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:126)    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:166)    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134)    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892)    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)    

Pom.xml

<dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-webflux</artifactId>            <version>${spring-boot.version}</version>            <exclusions>                <exclusion>                    <groupId>org.springframework.boot</groupId>                    <artifactId>spring-boot-starter-logging</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>            <version>${spring-boot.version}</version>            <exclusions>                <exclusion>                    <groupId>org.springframework.boot</groupId>                    <artifactId>spring-boot-starter-logging</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>io.projectreactor.netty</groupId>            <artifactId>reactor-netty</artifactId>            <version>${reactor-netty.version}</version>        </dependency>    </dependencies>

版本:

    <spring-boot.version>2.1.4.RELEASE</spring-boot.version>    <reactor-netty.version>0.8.6.RELEASE</reactor-netty.version>

Answer 1

正如 @Brian Clozel 提到的，这可能是由于“Spring WebFlux”和“Spring MVC”框架的共存以及 Spring 在将应用程序配置为基于 servlet 的 Web 应用程序时的自动化行为造成的 ( here )。

因此，尝试将您的应用程序作为 REACTIVE Web 应用程序运行:

//以编程方式here

public static void main(String[] args) {
    SpringApplication springApplication = new SpringApplication(YourApp.class);
    springApplication.setWebApplicationType(WebApplicationType.REACTIVE);
    springApplication.run(args);
}

//按属性here

spring.main.web-application-type=REACTIVE