java.lang.NoSuchMethodError io.swagger.annotations.ApiParam.allowEmptyValue()Z

错误信息

com.google.common.util.concurrent.ExecutionError: java.lang.NoSuchMethodError: io.swagger.annotations.ApiParam.allowEmptyValue()Z

at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2212)

at com.google.common.cache.LocalCache.get(LocalCache.java:4053)

at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4057)

at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4986)

at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4992)

at springfox.documentation.spring.web.scanners.CachingOperationReader.read(CachingOperationReader.java:57)

at springfox.documentation.spring.web.scanners.ApiDescriptionReader.read(ApiDescriptionReader.java:70)

at springfox.documentation.spring.web.scanners.ApiListingScanner.scan(ApiListingScanner.java:134)

at springfox.documentation.spring.web.scanners.ApiDocumentationScanner.scan(ApiDocumentationScanner.java:71)

at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.scanDocumentation(DocumentationPluginsBootstrapper.java:101)

at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.start(DocumentationPluginsBootstrapper.java:167)

at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182)

at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53)

at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360)

at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158)

at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122)

at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:894)

at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:163)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)

at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)

at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)

at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)

at com.boot.BootApplication.main(BootApplication.java:42)

Caused by: java.lang.NoSuchMethodError: io.swagger.annotations.ApiParam.allowEmptyValue()Z

at springfox.documentation.swagger.readers.parameter.ApiParamParameterBuilder.apply(ApiParamParameterBuilder.java:72)

at springfox.documentation.spring.web.plugins.DocumentationPluginsManager.parameter(DocumentationPluginsManager.java:106)

at springfox.documentation.spring.web.readers.operation.OperationParameterReader.readParameters(OperationParameterReader.java:103)

at springfox.documentation.spring.web.readers.operation.OperationParameterReader.apply(OperationParameterReader.java:75)

at springfox.documentation.spring.web.plugins.DocumentationPluginsManager.operation(DocumentationPluginsManager.java:120)

at springfox.documentation.spring.web.readers.operation.ApiOperationReader.read(ApiOperationReader.java:73)

at springfox.documentation.spring.web.scanners.CachingOperationReader$1.load(CachingOperationReader.java:50)

at springfox.documentation.spring.web.scanners.CachingOperationReader$1.load(CachingOperationReader.java:48)

at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3628)

at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2336)

at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2295)

at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2208)

... 25 common frames omitted

原因

项目中引入的 springfox-swagger 版本与 swagger-annotations 版本不兼容，导致运行时找不到方法 allowEmptyValue()：
这是 swagger-annotations 1.5.22（或更高版本）中 @ApiParam 注解的方法。如果你当前的 swagger-annotations 是低版本（如 1.5.20 或更低），它就没有这个方法，运行时就会抛出 NoSuchMethodError。

解决方案

修改 pom 文件信息,将 swagger-annotations 版本确定为 1.5.22

<dependency>
	<groupId>io.swagger</groupId>
	<artifactId>swagger-annotations</artifactId>
	<version>1.5.22</version>
</dependency>