[启动失败] NPE：'controllerSwagger' & DocApi api (size=0)
Closed this issue · 3 comments
miozus commented
我的项目从未引用过接口文档，今天刷B站所以来到了这里，按文档（版本1.1.6.final）做，跑不起来。看文档、视频、议题，无数次调试想找到创建实例时在哪里失败，一路断点找原因
| ID | Descripttion | Screenshot |
|---|---|---|
| 1 | RequestTypeMatchingSwagger.matching(api); 追到了这行，因为此后五六条栈帧会跳转 Spring 容器代理，大概说 BeanFactory 创建单例失败了，向上层抛出 NPE。这段代码，它似乎在扫描我项目文件中符合 Swagger 注解类型的特征，现在找到 0 个，匹配 0，就销毁 Bean 单例了。 |
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| 2 | 所以为什么这里 DocApi 类型的 api 是零个值呢？顺着 api 的值去找线索：比如请求路径 outPath=/order/mqmessage找到控制器，找到 update 方法。这些是人人开源插件自动生成的代码，请求类型注解都是 @RequestMapping。 |
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| 3 | 现在点进匹配方法 matching 看匹配规则，似乎它扫描控制器的所有注解后，在做统计。由于上一步 DocApi 为空（size=0），获取不到 api 的方法名称，也不能添加路径赋值。 |
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| 4 | 那么，我们回到上一步，具体怎么构造 / 更新 DocApi 的呢？如图，看上去每个属性被参数赋值，但返回后就 size=0 ，api 点开看不到值了。实际步进每一行 set 语句，发现赋值方法都失效了，DOC_API 仍是空值（空构造器）。推测原因：final static 修饰的属性，只能手动赋值一次（仅限两种方式：声明时赋值，或静态代码块中赋值）。上面图 1 中第 27 行语句首次调用 DOC_API，意味着通过无参构造方法实例化，获得空值（空构造器），已经消耗了一次机会，它不能被修改了。参考文章 Java 中为 final 变量赋值的几种方式 |
 |
我的配置
ydoc:
enable: true
host: http://111.222.333.444:40001
token: 81***6a
headers:
sping:
mvc:
date-format: yyyy-MM-dd HH:mm:ss
pathmatch:
matching-strategy: ant_path_matcher备注
@EnableSwagger2启动类注解，有无都会报错headers：空值，有无此属性都会报错。来自文章评论区pathmatch：有无此属性都会报错。来自议题- 订单微服务：依赖较多，ydoc 放在公共依赖中。详见文末
启动日志
C:\Users\miozus\.jdks\corretto-1.8.0_322\bin\java.exe -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:60731,suspend=y,server=n -Dvisualvm.id=8949864274300 -Xmx100m -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -javaagent:E:\JetBrains\Toolbox\apps\IDEA-U\ch-1\221.4165.146\plugins\java\lib\rt\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath 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kson-databind-2.11.1.jar;D:\server\maven\repository\com\fasterxml\jackson\core\jackson-annotations\2.11.1\jackson-annotations-2.11.1.jar;D:\server\maven\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.11.1\jackson-datatype-jdk8-2.11.1.jar;D:\server\maven\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.11.1\jackson-datatype-jsr310-2.11.1.jar;D:\server\maven\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.11.1\jackson-module-parameter-names-2.11.1.jar;D:\server\maven\repository\org\springframework\boot\spring-boot-starter-tomcat\2.3.2.RELEASE\spring-boot-starter-tomcat-2.3.2.RELEASE.jar;D:\server\maven\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.37\tomcat-embed-core-9.0.37.jar;D:\server\maven\repository\org\glassfish\jakarta.el\3.0.3\jakarta.el-3.0.3.jar;D:\server\maven\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.37\tomcat-embed-websocket-9.0.37.jar;D:\server\maven\repository\org\springframework\spring-webmvc\5.2.8.RELEASE\spring-webmvc-5.2.8.RELEASE.jar;D:\server\maven\repository\org\springframework\spring-expression\5.2.8.RELEASE\spring-expression-5.2.8.RELEASE.jar;D:\server\maven\repository\org\springframework\cloud\spring-cloud-starter-openfeign\2.2.4.RELEASE\spring-cloud-starter-openfeign-2.2.4.RELEASE.jar;D:\server\maven\repository\org\springframework\cloud\spring-cloud-starter\2.2.4.RELEASE\spring-cloud-starter-2.2.4.RELEASE.jar;D:\server\maven\repository\org\springframework\security\spring-security-rsa\1.0.9.RELEASE\spring-security-rsa-1.0.9.RELEASE.jar;D:\server\maven\repository\org\bouncycastle\bcpkix-jdk15on\1.64\bcpkix-jdk15on-1.64.jar;D:\server\maven\repository\org\springframework\cloud\spring-cloud-openfeign-core\2.2.4.RELEASE\spring-cloud-openfeign-core-2.2.4.RELEASE.jar;D:\server\maven\repository\org\springframework\cloud\spring-cloud-netflix-ribbon\2.2.4.RELEASE\spring-cloud-netflix-ribbon-2.2.4.RELEASE.jar;D:\server\maven\repository\org\springframework\cloud\spring-cloud-netflix-archaius\2.2.4.RELEASE\spring-cloud-netflix-archaius-2.2.4.RELEASE.jar;D:\server\maven\repository\org\springframework\boot\spring-boot-starter-aop\2.3.2.RELEASE\spring-boot-starter-aop-2.3.2.RELEASE.jar;D:\server\maven\repository\org\aspectj\aspectjweaver\1.9.6\aspectjweaver-1.9.6.jar;D:\server\maven\repository\io\github\openfeign\form\feign-form-spring\3.8.0\feign-form-spring-3.8.0.jar;D:\server\maven\repository\io\github\openfeign\form\feign-form\3.8.0\feign-form-3.8.0.jar;D:\server\maven\repository\commons-fileupload\commons-fileupload\1.4\commons-fileupload-1.4.jar;D:\server\maven\repository\org\springframework\cloud\spring-cloud-commons\2.2.4.RELEASE\spring-cloud-commons-2.2.4.RELEASE.jar;D:\server\maven\repository\org\springframework\security\spring-security-crypto\5.3.3.RELEASE\spring-security-crypto-5.3.3.RELEASE.jar;D:\server\maven\repository\io\github\openfeign\feign-core\10.10.1\feign-core-10.10.1.jar;D:\server\maven\repository\io\github\openfeign\feign-slf4j\10.10.1\feign-slf4j-10.10.1.jar;D:\server\maven\repository\io\github\openfeign\feign-hystrix\10.10.1\feign-hystrix-10.10.1.jar;D:\server\maven\repository\com\netflix\archaius\archaius-core\0.7.6\archaius-core-0.7.6.jar;D:\server\maven\repository\com\google\code\findbugs\jsr305\3.0.1\jsr305-3.0.1.jar;D:\server\maven\repository\commons-configuration\commons-configuration\1.8\commons-configuration-1.8.jar;D:\server\maven\repository\com\netflix\hystrix\hystrix-core\1.5.18\hystrix-core-1.5.18.jar;D:\server\maven\repository\org\hdrhistogram\HdrHistogram\2.1.9\HdrHistogram-2.1.9.jar;D:\server\maven\repository\net\bytebuddy\byte-buddy\1.10.13\byte-buddy-1.10.13.jar;D:\server\maven\repository\org\springframework\spring-core\5.2.8.RELEASE\spring-core-5.2.8.RELEASE.jar;E:\JetBrains\Toolbox\apps\IDEA-U\ch-1\221.4165.146\lib\idea_rt.jar cn.miozus.gulimall.order.GulimallOrderApplication
Connected to the target VM, address: '127.0.0.1:60731', transport: 'socket'
. ____ _ __ _ _
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( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
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' |____| .__|_| |_|_| |_\__, | / / / /
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:: Spring Boot :: (v2.3.2.RELEASE)
2022-02-18 20:29:21.439 INFO 5900 --- [ main] c.a.n.c.c.impl.LocalConfigInfoProcessor : LOCAL_SNAPSHOT_PATH:C:\Users\miozus\nacos\config
2022-02-18 20:29:21.470 INFO 5900 --- [ main] c.a.nacos.client.config.impl.Limiter : limitTime:5.0
2022-02-18 20:29:21.639 INFO 5900 --- [ main] c.a.nacos.client.config.utils.JvmUtil : isMultiInstance:false
2022-02-18 20:29:22.704 WARN 5900 --- [ main] c.a.c.n.c.NacosPropertySourceBuilder : Ignore the empty nacos configuration and get it based on dataId[gulimall-order] & group[DEFAULT_GROUP]
2022-02-18 20:29:22.732 WARN 5900 --- [ main] c.a.c.n.c.NacosPropertySourceBuilder : Ignore the empty nacos configuration and get it based on dataId[gulimall-order.properties] & group[DEFAULT_GROUP]
2022-02-18 20:29:22.732 INFO 5900 --- [ main] b.c.PropertySourceBootstrapConfiguration : Located property source: [BootstrapPropertySource {name='bootstrapProperties-gulimall-order.properties,DEFAULT_GROUP'}, BootstrapPropertySource {name='bootstrapProperties-gulimall-order,DEFAULT_GROUP'}, BootstrapPropertySource {name='bootstrapProperties-ydoc.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-cache.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-pay.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-feign.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-redis.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-threadpool.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-rabbitmq.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-other.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-mybatis.yml,pro'}, BootstrapPropertySource {name='bootstrapProperties-datasource.yml,pro'}]
2022-02-18 20:29:22.763 INFO 5900 --- [ main] c.m.g.order.GulimallOrderApplication : No active profile set, falling back to default profiles: default
2022-02-18 20:29:23.221 INFO 5900 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2022-02-18 20:29:23.221 INFO 5900 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2022-02-18 20:29:23.237 INFO 5900 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 8ms. Found 0 Redis repository interfaces.
2022-02-18 20:29:23.394 INFO 5900 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=bed9f933-1953-3f2b-a74e-16adf5f487bc
2022-02-18 20:29:23.815 INFO 5900 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-02-18 20:29:23.831 INFO 5900 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-02-18 20:29:23.831 INFO 5900 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.37]
2022-02-18 20:29:23.909 INFO 5900 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-02-18 20:29:23.909 INFO 5900 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1130 ms
_ _ |_ _ _|_. ___ _ | _
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/ |
3.3.1
2022-02-18 20:29:26.833 WARN 5900 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2022-02-18 20:29:26.833 INFO 5900 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2022-02-18 20:29:26.837 WARN 5900 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2022-02-18 20:29:26.837 INFO 5900 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2022-02-18 20:29:27.401 INFO 5900 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService 'Nacos-Watch-Task-Scheduler'
_ _ ____ _____ ___
( \/ )( _ \( _ )/ __)
\ / )(_) ))(_)(( (__
(__) (____/(_____)\___)
v1.1.6.final
2022-02-18 20:41:23.033 WARN 5900 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'controllerSwagger' defined in class path resource [com/github/ydoc/config/AutoConfig.class]: Invocation of init method failed; nested exception is java.lang.NullPointerException
2022-02-18 20:41:23.033 WARN 5900 --- [ main] o.s.b.f.support.DisposableBeanAdapter : Destroy method 'close' on bean with name 'nacosServiceRegistry' threw an exception: java.lang.NullPointerException
2022-02-18 20:41:23.343 INFO 5900 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2022-02-18 20:41:23.457 INFO 5900 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-02-18 20:41:23.488 ERROR 5900 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'controllerSwagger' defined in class path resource [com/github/ydoc/config/AutoConfig.class]: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1794) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at cn.miozus.gulimall.order.GulimallOrderApplication.main(GulimallOrderApplication.java:26) [classes/:na]
Caused by: java.lang.NullPointerException: null
at com.github.ydoc.core.handler.api.RequestHandler.generateApi(RequestHandler.java:16) ~[ydoc-spring-boot-starter-1.1.6.final.jar:1.1.6.final]
at com.github.ydoc.core.handler.api.RequestHandler.generateApi(RequestHandler.java:10) ~[ydoc-spring-boot-starter-1.1.6.final.jar:1.1.6.final]
at com.github.ydoc.core.RequestTypeMatchingSwagger.matching(RequestTypeMatchingSwagger.java:67) ~[ydoc-spring-boot-starter-1.1.6.final.jar:1.1.6.final]
at com.github.ydoc.core.ScanControllerSwagger.scan(ScanControllerSwagger.java:105) ~[ydoc-spring-boot-starter-1.1.6.final.jar:1.1.6.final]
at com.github.ydoc.core.ScanControllerSwagger.afterPropertiesSet(ScanControllerSwagger.java:163) ~[ydoc-spring-boot-starter-1.1.6.final.jar:1.1.6.final]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1853) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1790) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
... 17 common frames omitted
2022-02-18 20:41:24.247 WARN 5900 --- [ Thread-2] c.a.n.common.http.HttpClientBeanHolder : [HttpClientBeanHolder] Start destroying common HttpClient
2022-02-18 20:41:24.247 WARN 5900 --- [ Thread-2] c.a.n.common.http.HttpClientBeanHolder : [HttpClientBeanHolder] Destruction of the end
Disconnected from the target VM, address: '127.0.0.1:60731', transport: 'socket'
Process finished with exit code 1项目依赖 Maven
<!-- 公共依赖（全部版本）-->
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<lombok.version>1.18.22</lombok.version>
<mysql.version>8.0.26</mysql.version>
<mybatis.plus.boot.version>3.3.1</mybatis.plus.boot.version>
<servlet.api.version>2.5</servlet.api.version>
<commons.lang.version>2.6</commons.lang.version>
<httpcore.version>4.4.15</httpcore.version>
<fastjson.version>1.2.79</fastjson.version>
<validation.api.version>2.0.1.Final</validation.api.version>
<hutool.all.version>5.7.20</hutool.all.version>
<hibernate.validator.version>7.0.1.Final</hibernate.validator.version>
<spring.web.version>5.2.8.RELEASE</spring.web.version>
<ydoc.spring.boot.starter.version>1.1.6.final</ydoc.spring.boot.starter.version>
</properties>
<!-- 订单微服务依赖-->
<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>2.3.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>cn.miozus</groupId>
<artifactId>gulimall-order</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>gulimall-order</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>8</java.version>
<spring-cloud.version>Hoxton.SR7</spring-cloud.version>
</properties>
<dependencies>
<!-- 支付宝SDK -->
<dependency>
<groupId>com.alipay.sdk</groupId>
<artifactId>alipay-sdk-java</artifactId>
<version>4.22.30.ALL</version>
</dependency>
<!-- 分布式缓存 redis -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<!-- 统一储存 session 跨域共享 -->
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
</dependency>
<!-- 消息队列 RabbitMQ -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
<!-- 前端页面渲染模板 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!-- 公共依赖包 -->
<dependency>
<groupId>cn.miozus.gulimall</groupId>
<artifactId>gulimall-common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<!-- 初始勾选的两个依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</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>NoBugBoy commented
request body后最好是个对象，不要用map来接收参数 ，等下我再细看看
NoBugBoy commented
而且你这个@RequestMapping没有指定method属性阿
luyuan9870 commented
而且你这个@RequestMapping没有指定method属性阿
大佬, 请问后续会推出 不强制指定method属性的功能吗