如何解决Spring Cloud Gateway和Swagger是否存在兼容性问题，出现错误
我正在动手使用Spring Cloud Gateway和Swagger创建微服务。无法启动我的应用程序。它给出了无法自检类springfox.documentation.swagger2.configuration.Swagger2DocumentationConfiguration 上的注释方法，该错误需要 spring-boot-starter-web 依赖性。但是在包含此依赖项时，在类路径上发现了错误 Spring MVC，该错误此时与Spring Cloud Gateway不兼容。请删除spring-boot-starter-web依赖项。
我们不能在Spring Cloud Gateway中使用Swagger吗？
第一项微服务：
代码
pom.xml：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>SCG</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SCG</name>
<description>Demo project for Spring Cloud Gateway having two MS.</description>
<properties>
<java.version>11</java.version>
<spring-cloud.version>Hoxton.SR8</spring-cloud.version>
</properties>
<dependencies>
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
SPringCloudConfig ：
package com.ashish.mongo1.config;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.reactive.config.ResourceHandlerRegistry;
@Configuration
public class SPringCloudConfig {
@Bean
public RouteLocator gatewayRoutes(RouteLocatorBuilder builder) {
return builder.routes()
.route(r -> r.path("/ms/ms2")
.uri("http://localhost:8081/")
.id("firstMS"))
.build();
}
}
引导程序类：
package com.ashish.mongo1;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@SpringBootApplication
@EnableSwagger2
public class ScgApplication {
RestTemplate rt;
public static void main(String[] args) {
SpringApplication.run(ScgApplication.class,args);
}
public RestTemplate restTemplate() {
return new RestTemplate();
}
@Bean
public Docket swaggerConfiguration() {
return new Docket(DocumentationType.SWAGGER_2)
.select()
.paths(PathSelectors.ant("/ms/*"))
.apis(RequestHandlerSelectors.basePackage("com.ashish.mongo1"))
.build()
.apiInfo(apiInfo());
}
@SuppressWarnings("deprecation")
private ApiInfo apiInfo() {
return new ApiInfo(
"Microservice 2","Sample API for Swagger Use","1.0","Free to use","Ashish Kumar","API License","http://localhost:8080/ms/ms2");
}
}
控制器：
package com.ashish.mongo1.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
@RequestMapping("/ms")
public class FirstMSResource {
RestTemplate rt = restTemplate();
@GetMapping("/ms1")
public String firstMS() {
String s = rt.getForObject("http://localhost:8081/ms/ms2",String.class);
return "MS-1 called...."+s;
}
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
第二种微服务：
pom.xml：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>SCG</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SCG</name>
<description>Demo project for Spring Cloud Gateway having two MS.</description>
<properties>
<java.version>11</java.version>
<spring-cloud.version>Hoxton.SR8</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
application.yml：
server:
port: 8081
控制器：
package com.ashish.mongo1.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/ms")
public class SecondMSResource {
@GetMapping("/ms2")
public String firstMS() {
return "MS-2 called....";
}
}
引导程序类：
package com.ashish.mongo1;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@SpringBootApplication
@EnableSwagger2
public class ScgApplication {
public static void main(String[] args) {
SpringApplication.run(ScgApplication.class,args);
}
@Bean
public Docket swaggerConfiguration() {
return new Docket(DocumentationType.SWAGGER_2)
.select()
.paths(PathSelectors.ant("/ms/*"))
.apis(RequestHandlerSelectors.basePackage("com.ashish.mongo1"))
.build()
.apiInfo(apiInfo());
}
@SuppressWarnings("deprecation")
private ApiInfo apiInfo() {
return new ApiInfo(
"Microservice 2","http://localhost:8080/ms/ms2");
}
}
在运行应用程序时出现以下错误：
2020-10-24 23:06:16.500 INFO 19896 --- [ restartedMain] com.ashish.mongo1.ScgApplication : No active profile set,falling back to default profiles: default
2020-10-24 23:06:17.520 INFO 19896 --- [ restartedMain] o.s.cloud.context.scope.GenericScope : BeanFactory id=863b9547-dc4a-3869-8a25-0fd2918e238c
2020-10-24 23:06:17.992 INFO 19896 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-10-24 23:06:18.002 INFO 19896 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-10-24 23:06:18.002 INFO 19896 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.38]
2020-10-24 23:06:18.135 INFO 19896 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-10-24 23:06:18.135 INFO 19896 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1622 ms
2020-10-24 23:06:18.483 INFO 19896 --- [ restartedMain] pertySourcedRequestMappingHandlerMapping : Mapped URL path [/v2/api-docs] onto method [springfox.documentation.swagger2.web.Swagger2Controller#getDocumentation(String,HttpServletRequest)]
2020-10-24 23:06:18.527 WARN 19896 --- [ restartedMain] GatewayClassPathWarningAutoConfiguration :
**********************************************************
**Spring MVC found on classpath,which is incompatible with Spring Cloud Gateway at this time. Please remove spring-boot-starter-web dependency.**
**********************************************************
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils (file:/C:/Users/send2/.m2/repository/org/springframework/spring-core/5.2.9.RELEASE/spring-core-5.2.9.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2020-10-24 23:06:18.956 WARN 19896 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'routeDefinitionRouteLocator' defined in class path resource [org/springframework/cloud/gateway/config/GatewayAutoConfiguration.class]: Unsatisfied dependency expressed through method 'routeDefinitionRouteLocator' parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'modifyRequestBodyGatewayFilterFactory' defined in class path resource [org/springframework/cloud/gateway/config/GatewayAutoConfiguration.class]: Unsatisfied dependency expressed through method 'modifyRequestBodyGatewayFilterFactory' parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.http.codec.ServerCodecConfigurer' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
2020-10-24 23:06:18.958 INFO 19896 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2020-10-24 23:06:18.973 INFO 19896 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-10-24 23:06:19.141 ERROR 19896 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 0 of method modifyRequestBodyGatewayFilterFactory in org.springframework.cloud.gateway.config.GatewayAutoConfiguration required a bean of type 'org.springframework.http.codec.ServerCodecConfigurer' that could not be found.
Action:
**Consider defining a bean of type 'org.springframework.http.codec.ServerCodecConfigurer' in your configuration.**
和
删除 spring-boot-starter-web 依赖性后，出现以下错误：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-10-24 23:29:05.719 ERROR 19676 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [com.ashish.mongo1.ScgApplication]; nested exception is java.lang.IllegalStateException: Failed to introspect annotated methods on class springfox.documentation.swagger2.configuration.Swagger2DocumentationConfiguration
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:610) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:311) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:250) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:207) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:175) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:319) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:280) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:96) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:707) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:533) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:62) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.4.RELEASE.jar:2.3.4.RELEASE]
at com.ashish.mongo1.ScgApplication.main(ScgApplication.java:22) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.3.4.RELEASE.jar:2.3.4.RELEASE]
Caused by: java.lang.IllegalStateException: **Failed to introspect annotated methods on class springfox.documentation.swagger2.configuration.Swagger2DocumentationConfiguration**
at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:162) ~[spring-core-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.retrieveBeanMethodMetadata(ConfigurationClassParser.java:403) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:326) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:250) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:600) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
... 23 common frames omitted
Caused by: java.lang.IllegalStateException: Failed to introspect Class [springfox.documentation.swagger2.configuration.Swagger2DocumentationConfiguration] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2626b418]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:481) ~[spring-core-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:455) ~[spring-core-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:151) ~[spring-core-5.2.9.RELEASE.jar:5.2.9.RELEASE]
... 27 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/web/servlet/HandlerMapping
at java.base/java.lang.Class.getDeclaredMethods0(Native Method) ~[na:na]
at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3244) ~[na:na]
at java.base/java.lang.Class.getDeclaredMethods(Class.java:2387) ~[na:na]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:463) ~[spring-core-5.2.9.RELEASE.jar:5.2.9.RELEASE]
... 29 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.web.servlet.HandlerMapping
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602) ~[na:na]
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[na:na]
... 33 common frames omitted
解决方法
Spring Cloud Gateway是基于Project Reactor构建的，已经包含一个Netty（而不是Tomcat服务器）。
所以请尝试删除：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
Springfox还不支持Spring Webflux，但是有一种解决方案可以工作，为此，您需要执行以下描述的步骤。
使用以下内容替换依赖项：
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>3.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>3.0.0-SNAPSHOT</version>
</dependency>
添加此依赖项：
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-spring-webflux</artifactId>
<version>3.0.0-SNAPSHOT</version>
</dependency>
添加存储库：
<repositories>
<repository>
<id>spring-milestone</id>
<name>Spring Maven MILESTONE Repository</name>
<url>https://repo.spring.io/libs-milestone</url>
</repository>
<repository>
<id>jcenter-snapshots</id>
<name>jcenter</name>
<url>http://oss.jfrog.org/artifactory/oss-snapshot-local/</url>
</repository>
</repositories>
将注释更改为此：
@EnableSwagger2WebFlux
工作草案可以在this link上找到。
,@ V.Mokrecov，我不同意有关Springfox对SpringWebFlux的支持。
对于Springfox和SpringWebFlux，仅以下依赖项就足够了：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-boot-starter</artifactId>
<version>3.0.0</version>
</dependency>
随着Springfox 3.0.0的发布，现在也不再需要包含注释了。您可以省略@ EnableSwagger2和@ EnableSwagger2WebFlux。
包括这些依赖项对我有用。
实现此目的的代码可以在this link
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