Why HATEOAS starts creating issue for spring-boot version >= 2.2.x during startup with Swagger 2.x?

Question

I moved my project from spring-boot 2.1.9 to 2.2.0.

While starting the project, I am facing the below error messages.

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.plugin.core.PluginRegistry<org.springframework.hateoas.client.LinkDiscoverer, org.springframework.http.MediaType>' available: expected single matching bean but found 17: modelBuilderPluginRegistry,modelPropertyBuilderPluginRegistry,typeNameProviderPluginRegistry,syntheticModelProviderPluginRegistry,documentationPluginRegistry,apiListingBuilderPluginRegistry,operationBuilderPluginRegistry,parameterBuilderPluginRegistry,expandedParameterBuilderPluginRegistry,resourceGroupingStrategyRegistry,operationModelsProviderPluginRegistry,defaultsProviderPluginRegistry,pathDecoratorRegistry,apiListingScannerPluginRegistry,relProviderPluginRegistry,linkDiscovererRegistry,entityLinksPluginRegistry   Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'linkDiscoverers' defined in class path resource [org/springframework/hateoas/config/HateoasConfiguration.class]: Unsatisfied dependency expressed through method 'linkDiscoverers' parameter 0; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.plugin.core.PluginRegistry<org.springframework.hateoas.client.LinkDiscoverer, org.springframework.http.MediaType>' available: expected single matching bean but found 17: modelBuilderPluginRegistry,modelPropertyBuilderPluginRegistry,typeNameProviderPluginRegistry,syntheticModelProviderPluginRegistry,documentationPluginRegistry,apiListingBuilderPluginRegistry,operationBuilderPluginRegistry,parameterBuilderPluginRegistry,expandedParameterBuilderPluginRegistry,resourceGroupingStrategyRegistry,operationModelsProviderPluginRegistry,defaultsProviderPluginRegistry,pathDecoratorRegistry,apiListingScannerPluginRegistry,relProviderPluginRegistry,linkDiscovererRegistry,entityLinksPluginRegistry   *************************** APPLICATION FAILED TO START ***************************  Description:   Parameter 0 of method linkDiscoverers in org.springframework.hateoas.config.HateoasConfiguration  required a single bean, but 17 were found: - modelBuilderPluginRegistry: defined in null - modelPropertyBuilderPluginRegistry: defined in null - typeNameProviderPluginRegistry: defined in null - syntheticModelProviderPluginRegistry: defined in null - documentationPluginRegistry: defined in null - apiListingBuilderPluginRegistry: defined in null - operationBuilderPluginRegistry: defined in null - parameterBuilderPluginRegistry: defined in null - expandedParameterBuilderPluginRegistry: defined in null - resourceGroupingStrategyRegistry: defined in null - operationModelsProviderPluginRegistry: defined in null - defaultsProviderPluginRegistry: defined in null - pathDecoratorRegistry: defined in null - apiListingScannerPluginRegistry: defined in null - relProviderPluginRegistry: defined by method 'relProviderPluginRegistry' in class path resource [org/springframework/hateoas/config/HateoasConfiguration.class] - linkDiscovererRegistry: defined in null - entityLinksPluginRegistry: defined by method 'entityLinksPluginRegistry' in class path resource [org/springframework/hateoas/config/WebMvcEntityLinksConfiguration.class] 

What could have caused this issue ?

Note: I am not using HATEOAS in my pom.xml file.

pom.xml

<properties>     <java.version>1.8</java.version>     <swagger-springfox.version>2.9.2</swagger-springfox.version>     <sonar.jacoco.execPath>${project.basedir}/target/jacoco.exec</sonar.jacoco.execPath>     <jasypt-spring-boot-starter>2.1.1</jasypt-spring-boot-starter>     <logbook-spring-boot-starter>1.13.0</logbook-spring-boot-starter>     <assertj-swagger>0.8.1</assertj-swagger>     <jacoco-version>0.8.4</jacoco-version> </properties> <dependencies>     <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-actuator</artifactId>     </dependency>     <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-data-jpa</artifactId>     </dependency>     <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-data-rest</artifactId>     </dependency>     <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-devtools</artifactId>         <scope>runtime</scope>     </dependency>     <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-configuration-processor</artifactId>     </dependency>     <dependency>         <groupId>org.projectlombok</groupId>         <artifactId>lombok</artifactId>         <optional>true</optional>     </dependency>     <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-test</artifactId>         <scope>test</scope>     </dependency>     <dependency>         <groupId>io.springfox</groupId>         <artifactId>springfox-swagger2</artifactId>         <version>${swagger-springfox.version}</version>     </dependency>     <dependency>         <groupId>io.springfox</groupId>         <artifactId>springfox-swagger-ui</artifactId>         <version>${swagger-springfox.version}</version>     </dependency>     <dependency>         <groupId>io.springfox</groupId>         <artifactId>springfox-spring-web</artifactId>         <version>${swagger-springfox.version}</version>     </dependency>     <dependency>         <groupId>io.springfox</groupId>         <artifactId>springfox-core</artifactId>         <version>${swagger-springfox.version}</version>     </dependency>     <dependency>         <groupId>io.springfox</groupId>         <artifactId>springfox-data-rest</artifactId>         <version>${swagger-springfox.version}</version>     </dependency>     <dependency>         <groupId>io.springfox</groupId>         <artifactId>springfox-bean-validators</artifactId>         <version>${swagger-springfox.version}</version>     </dependency> 

Answer 1

I had this issue with Swagger + HATEOAS in my spring-boot application.

The fix is given below (edit your Swagger configuration class):

@Configuration @EnableSwagger2 public class SwaggerConfiguration {      @Bean     public LinkDiscoverers discoverers() {         List<LinkDiscoverer> plugins = new ArrayList<>();         plugins.add(new CollectionJsonLinkDiscoverer());         return new LinkDiscoverers(SimplePluginRegistry.create(plugins));      } } 

Answer 2

For me this link helped: https://github.com/spring-projects/spring-hateoas/issues/731

In a nutshell i added to my dependencies:

<dependency>     <groupId>org.springframework.plugin</groupId>     <artifactId>spring-plugin-core</artifactId>     <version>2.0.0.RELEASE</version> </dependency>