一、问题
本地我的项目做了Swagger2的配置，在启动时报如下谬误：
DocumentationPluginsBootstrapper : Unable to scan documentation context default测试的Controller文件：
package com.quantsmart.controller;import com.quantsmart.model.R;import io.swagger.annotations.Api;import io.swagger.annotations.ApiImplicitParam;import io.swagger.annotations.ApiImplicitParams;import io.swagger.annotations.ApiOperation;import io.swagger.annotations.Authorization;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;/** * @author: kaiyi * @Date 2021/5/21 13:57 */@RestController@Api(tags = "CoinCommon外面的测试接口")public class TestController { @GetMapping("/common/test") @ApiOperation(value = "测试方法", authorizations = {@Authorization("Authorization")}) @ApiImplicitParams({ @ApiImplicitParam(name = "param", value = "参数1", dataType = "String", paramType = "query", example = "paramValue"), @ApiImplicitParam(name = "param1", value = "参数2", dataType = "String", paramType = "query", example = "paramValue") }) public R<String> testMethod(String param, String param2){ return R.ok("ok,哈哈哈，测试哇"); }}Swagger2配置
/config/swagger/SwaggerProperties.java
package com.quantsmart.config.swagger;import lombok.Data;import org.springframework.boot.context.properties.ConfigurationProperties;/** * @author: kaiyi * @Date 2021/5/20 16:50 */@Data@ConfigurationProperties(prefix = "swagger2")public class SwaggerProperties { /** * 是否开启swagger */ private Boolean enabled; /** * 包扫描的门路 */ private String basePackage; /** * 联系人的名称 */ private String name ; /** * 联系人的主页 */ private String url ; /** * 联系人的邮箱 */ private String email ; /** * API的题目 */ private String title ; /** * API的形容 */ private String description ; /** * API的版本号 */ private String version ; /** * API的服务团队 */ private String termsOfServiceUrl ;}/config/swagger/SwaggerAutoConfiguration.java
package com.quantsmart.config.swagger;import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import springfox.documentation.builders.ApiInfoBuilder;import springfox.documentation.builders.PathSelectors;import springfox.documentation.builders.RequestHandlerSelectors;import springfox.documentation.service.*;import springfox.documentation.spi.DocumentationType;import springfox.documentation.spi.service.contexts.SecurityContext;import springfox.documentation.spring.web.plugins.Docket;import springfox.documentation.swagger2.annotations.EnableSwagger2;import java.util.Arrays;import java.util.List;/** * @author: kaiyi * @Date 2021/5/20 16:50 */@Configuration@EnableSwagger2 // 开启swagger2主动生成api文档的性能@EnableConfigurationProperties(SwaggerProperties.class)public class SwaggerAutoConfiguration { private SwaggerProperties swaggerProperties; public SwaggerAutoConfiguration(SwaggerProperties swaggerProperties) { this.swaggerProperties = swaggerProperties; } @Bean public Docket docket() { Docket docket = new Docket(DocumentationType.SWAGGER_2) .apiInfo(apiInfo()) .select() .apis(RequestHandlerSelectors.basePackage(swaggerProperties.getBasePackage())) .paths(PathSelectors.any()) .build(); // 平安的配置 docket.securitySchemes(securitySchemes()) // 平安规定 .securityContexts(securityContexts()); // 平安配置的高低问 return docket; } /** * api 信息的简介 * * @return */ private ApiInfo apiInfo() { return new ApiInfoBuilder().contact( new Contact(swaggerProperties.getName(), swaggerProperties.getUrl(), swaggerProperties.getEmail()) ) .title(swaggerProperties.getTitle()) .description(swaggerProperties.getDescription()) .version(swaggerProperties.getVersion()) .termsOfServiceUrl(swaggerProperties.getTermsOfServiceUrl()) .build(); } /** * 平安的规定配置 * * @return */ private List<SecurityScheme> securitySchemes() { return Arrays.asList(new ApiKey("Authorization", "Authorization", "Authorization")); } /** * 平安的上下文 * * @return */ private List<SecurityContext> securityContexts() { return Arrays.asList(new SecurityContext( Arrays.asList(new SecurityReference("Authorization", new AuthorizationScope[]{new AuthorizationScope("global", "accessResource")})), PathSelectors.any() )); }}留神这里的apis(RequestHandlerSelectors.basePackage(swaggerProperties.getBasePackage())) 扫描的是 controller包，是产生上面谬误的起因：
ERROR 4928 --- [ main] d.s.w.p.DocumentationPluginsBootstrapper : Unable to scan documentation context defaultjava.lang.NullPointerException: null at java.lang.String.startsWith(String.java:1405) ~[na:1.8.0_131] at java.lang.String.startsWith(String.java:1434) ~[na:1.8.0_131] at springfox.documentation.builders.RequestHandlerSelectors$4.apply(RequestHandlerSelectors.java:98) ~[springfox-core-2.9.2.jar:null] at springfox.documentation.builders.RequestHandlerSelectors$4.apply(RequestHandlerSelectors.java:95) ~[springfox-core-2.9.2.jar:null] at com.google.common.base.Present.transform(Present.java:75) ~[guava-20.0.jar:na] at springfox.documentation.builders.RequestHandlerSelectors$5.apply(RequestHandlerSelectors.java:114) ~[springfox-core-2.9.2.jar:null] at springfox.documentation.builders.RequestHandlerSelectors$5.apply(RequestHandlerSelectors.java:111) ~[springfox-core-2.9.2.jar:null] at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:384) ~[guava-20.0.jar:na] at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:384) ~[guava-20.0.jar:na] at com.google.common.collect.Iterators$6.computeNext(Iterators.java:617) ~[guava-20.0.jar:na] at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:145) ~[guava-20.0.jar:na] at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:140) ~[guava-20.0.jar:na] at springfox.documentation.spring.web.scanners.ApiListingReferenceScanner.scan(ApiListingReferenceScanner.java:48) ~[springfox-spring-web-2.9.2.jar:null] at springfox.documentation.spring.web.scanners.ApiDocumentationScanner.scan(ApiDocumentationScanner.java:67) ~[springfox-spring-web-2.9.2.jar:null] at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.scanDocumentation(DocumentationPluginsBootstrapper.java:101) [springfox-spring-web-2.9.2.jar:null] at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.start(DocumentationPluginsBootstrapper.java:167) [springfox-spring-web-2.9.2.jar:null] at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182) [spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53) [spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360) [spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158) [spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122) [spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:894) [spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162) [spring-boot-2.2.7.RELEASE.jar:2.2.7.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553) [spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) [spring-boot-2.2.7.RELEASE.jar:2.2.7.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.7.RELEASE.jar:2.2.7.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.7.RELEASE.jar:2.2.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.7.RELEASE.jar:2.2.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.7.RELEASE.jar:2.2.7.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.7.RELEASE.jar:2.2.7.RELEASE] at com.coin.TestCommonApplication.main(TestCommonApplication.java:12) [classes/:na]二、解决办法
上边曾经发现了问题了，如果我此时将apis(RequestHandlerSelectors.basePackage(swaggerProperties.getBasePackage()))改为我具体要扫描的包
apis(RequestHandlerSelectors.basePackage(“com.quantsmart.controller”))
此时重启，能够发现打印的日志中没呈现下面的谬误了，且DocumentationPluginsBootstrapper 中打印扫描到一个controller接口了。
上边的批改办法是间接写死的，所以，咱们能够在配置文件中配置swaggerProperties.getBasePackage()这个controller包门路（即SwaggerProperties类中的basePackage属性），例如在 application.yml 配置文件中增加controller包门路
# Swagger2属性配置swagger2: base-package: com.quantsmart.controller # 须要指定扫描的包的门路而后拜访 http://localhost:8989/swagger-ui.html 页面，能够看到能够胜利看到接口文档页面了：