找不到带有OpenApi / Swagger规范代码生成文件的Spring WebFlux

分类：编程问答

如何解决找不到带有OpenApi / Swagger规范代码生成文件的Spring WebFlux

我的spring webflux项目中已经有了生成的代码，但是运行时，它抛出一个异常，提示“ openapi.yaml”文件不存在。我搜索了此文件，他位于生成的项目（由openapi生成）的资源文件夹中。如您所见，HomeController通过Resource属性声明中的classpath：/openapi.yaml获取此文件。 我只是在问这个问题，因为这是生成的类的错误，我不知道这是否应该发生。

资源声明

@Value("classpath:/openapi.yaml")
    private Resource openapi;

HomeController类

package org.openapitools.configuration;

import com.fasterxml.jackson.dataformat.yaml.YAMLMapper;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.util.StreamUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.ServerResponse;

import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.nio.charset.Charset;

import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
import static org.springframework.web.reactive.function.server.RouterFunctions.route;

/**
 * Home redirection to OpenAPI api documentation
 */
@Controller
public class HomeController {

    private static YAMLMapper yamlMapper = new YAMLMapper();

    @Value("classpath:/openapi.yaml")
    private Resource openapi;

    @Bean
    public String openapiContent() throws IOException {
        try(InputStream is = openapi.getInputStream()) {
            return StreamUtils.copyToString(is,Charset.defaultCharset());
        }
    }

    @GetMapping(value = "/openapi.yaml",produces = "application/vnd.oai.openapi")
    @ResponseBody
    public String openapiYaml() throws IOException {
        return openapiContent();
    }

    @GetMapping(value = "/openapi.json",produces = "application/json")
    @ResponseBody
    public Object openapiJson() throws IOException {
        return yamlMapper.readValue(openapiContent(),Object.class);
    }

    @Bean
    RouterFunction<ServerResponse> index() {
        return route(
            GET("/"),req -> ServerResponse.temporaryRedirect(URI.create("swagger-ui/index.html?url=../openapi.json")).build()
        );
    }


}

错误已解决。

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-10-16 00:23:12.728 ERROR 30601 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'openapiContent' defined in class path resource [org/openapitools/configuration/HomeController.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.lang.String]: Factory method 'openapiContent' threw exception; nested exception is java.io.FileNotFoundException: class path resource [openapi.yaml] cannot be opened because it does not exist
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:655) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:483) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[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.gabriel.forum.ForumApplication.main(ForumApplication.java:10) ~[main/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.lang.String]: Factory method 'openapiContent' threw exception; nested exception is java.io.FileNotFoundException: class path resource [openapi.yaml] cannot be opened because it does not exist
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.lang.String]: Factory method 'openapiContent' threw exception; nested exception is java.io.FileNotFoundException: class path resource [openapi.yaml] cannot be opened because it does not exist

    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    ... 20 common frames omitted
Caused by: java.io.FileNotFoundException: class path resource [openapi.yaml] cannot be opened because it does not exist
Caused by: java.io.FileNotFoundException: class path resource [openapi.yaml] cannot be opened because it does not exist

    at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:180) ~[spring-core-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.openapitools.configuration.HomeController.openapiContent(HomeController.java:36) ~[main/: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:566) ~[na:na]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    ... 21 common frames omitted


> Task :ForumApplication.main() FAILED

Execution failed for task ':ForumApplication.main()'.
> Process 'command '/usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

The resource folder and the project structure.

解决方法

我找到了解决方法。

只需在您的build.gralde或pom.xml“ interfaceOnly”：“ true”中添加一个配置选项。

该配置将仅生成您在inputSpec文件中声明的接口和类，并且HomeController将不再存在以查找openapi.yml文件。

该解决方案仅适用于春季webflux项目。

以下是gradle语法中的配置选项：

    configOptions = [
            dateLibrary: "java8",reactive: "true","interfaceOnly": "true"
    ]

Maven语法：


<configOptions>
  <reactive>true</reactive>
  <java8>true</java8>
  <interfaceOnly>true</interfaceOnly>
</configOptions>

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