Springfox swagger not working in spring boot 2.2.0

springspring-bootspring-data-jpaspringfoxswagger-2.0

I want to upgrade spring boot v2.1.9 to 2.2.0. But after the upgrade I am getting some exceptions, which says spring fox is using an older version of spring-plugin-core.

Is there any alternate solution for this or do I need to give up the springfox plugin?

***************************
APPLICATION FAILED TO START
***************************

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    springfox.documentation.spring.web.plugins.DocumentationPluginsManager.createContextBuilder(DocumentationPluginsManager.java:152)

The following method did not exist:

    org.springframework.plugin.core.PluginRegistry.getPluginFor(Ljava/lang/Object;Lorg/springframework/plugin/core/Plugin;)Lorg/springframework/plugin/core/Plugin;

The method's class, org.springframework.plugin.core.PluginRegistry, is available from the following locations:

    jar:file:/C:/Users/regosa/.m2/repository/org/springframework/plugin/spring-plugin-core/2.0.0.RELEASE/spring-plugin-core-2.0.0.RELEASE.jar!/org/springframework/plugin/core/PluginRegistry.class

It was loaded from the following location:

    file:/C:/Users/regosa/.m2/repository/org/springframework/plugin/spring-plugin-core/2.0.0.RELEASE/spring-plugin-core-2.0.0.RELEASE.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of org.springframework.plugin.core.PluginRegistry

maven dependency tree file : https://drive.google.com/file/d/1gayvvVe_VsB1P2Hi2rcwRw8NdK89qtbq/view

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.xxxxx.business.workflow</groupId>
    <artifactId>xxxxx-component-workflow-starter</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>xxxxx-component-workflow-starter</name>
    <description>xxxxx-component-workflow-starter</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>11</java.version>
        <jaxb-runtime.version>2.4.0-b180830.0438</jaxb-runtime.version>
        <spring-cloud.version>Greenwich.M1</spring-cloud.version>
       <zeebe-version>0.20.1</zeebe-version>    
        <google-guava.version>27.0.1-jre</google-guava.version>
        <xxxxx.version>1.0</xxxxx.version>
        <swagger.version>2.9.2</swagger.version>
        <jjwt.version>0.9.1</jjwt.version>
        <json.version>20180813</json.version>
        <slf4j-api.version>1.7.25</slf4j-api.version>
        <mysql.version>8.0.11</mysql.version>
        <mongo-java-driver.version>3.10.1</mongo-java-driver.version>
        <commons-io.version>2.6</commons-io.version>
        <commons-lang.version>2.6</commons-lang.version>
        <commons-pool2.version>2.5.0</commons-pool2.version>
        <redis.version>3.1.0</redis.version>
        <velocity.version>1.7</velocity.version>
        <velocity-tools.version>2.0</velocity-tools.version>
        <logstash-logback-encoder.version>5.3</logstash-logback-encoder.version>
        <httpclient.version>4.5.6</httpclient.version>
        <jaxb-runtime.version>2.4.0-b180830.0438</jaxb-runtime.version>
        <env>local</env>
    </properties>   

    <dependencies>
        <!-- Start: Spring Libraries -->
        <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-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</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-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</artifactId>
        </dependency>
        <!-- End: Spring Libraries -->

        <!-- Adding JAXB Runtime since it is not shipped with JDK 9+ -->
        <dependency>
            <groupId>org.glassfish.jaxb</groupId>
            <artifactId>jaxb-runtime</artifactId>
            <version>${jaxb-runtime.version}</version>
        </dependency>

        <!-- Start: xxxxx Libraries -->
        <dependency>
            <groupId>com.xxxxx</groupId>
            <artifactId>xxxxx-entity</artifactId>
            <version>${xxxxx.version}</version>
        </dependency>
        <dependency>
            <groupId>com.xxxxx</groupId>
            <artifactId>xxxxx-redis</artifactId>
            <version>${xxxxx.version}</version>
        </dependency>
        <dependency>
            <groupId>com.xxxxx</groupId>
            <artifactId>xxxxx-mongo</artifactId>
            <version>${xxxxx.version}</version>
        </dependency>           
        <dependency>
            <groupId>com.xxxxx</groupId>
            <artifactId>xxxxx-util</artifactId>
            <version>${xxxxx.version}</version>
        </dependency>
        <dependency>
            <groupId>com.xxxxx.model</groupId>
            <artifactId>xxxxx-model</artifactId>
            <version>${xxxxx.version}</version>
        </dependency>
        <dependency>
            <groupId>com.xxxxx.service</groupId>
            <artifactId>xxxxx-common-service</artifactId>
            <version>${xxxxx.version}</version>
        </dependency>
        <dependency>
            <groupId>com.xxxxx.service</groupId>
            <artifactId>xxxxx-common-messaging</artifactId>
            <version>${xxxxx.version}</version>
        </dependency>   
        <dependency>
            <groupId>com.xxxxx.service</groupId>
            <artifactId>xxxxx-common-security</artifactId>
            <version>${xxxxx.version}</version>
        </dependency>           
        <!-- End: xxxxx Libraries -->

        <!--  Adding Zeebe client as part of the Spring Startup -->     
        <dependency>
            <groupId>io.zeebe</groupId>
            <artifactId>zeebe-client-java</artifactId>
            <version>${zeebe-version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>${google-guava.version}</version>
        </dependency>

        <!-- Logstash Log Encoder -->
        <dependency> 
            <groupId>net.logstash.logback</groupId> 
            <artifactId>logstash-logback-encoder</artifactId> 
            <version>${logstash-logback-encoder.version}</version> 
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver -->
        <dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongo-java-driver</artifactId>
            <version>${mongo-java-driver.version}</version>
        </dependency>       

        <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>${commons-io.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-lang/commons-lang -->
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>${commons-lang.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-pool2 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
            <version>${commons-pool2.version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>${redis.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>${httpclient.version}</version>
        </dependency>

        <!-- Start: Swagger Libraries -->
        <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${swagger.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${swagger.version}</version>
        </dependency>
        <!-- End: Swagger Libraries -->

        <!-- Start: Spring Boot and Security Test Libraries -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- End: Spring Boot and Security Test Libraries -->

    </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>
        <finalName>xxxxx-component-workflow-starter</finalName>
        <filters>
            <filter>${env}-build.properties</filter>
        </filters>
        <resources>
            <resource>
                <filtering>true</filtering>
                <directory>${project.basedir}/src/main/resources</directory>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <release>${java.version}</release>
                </configuration>
            </plugin>
            <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-jar-plugin</artifactId>
              <configuration>
                <archive>
                  <manifestEntries>
                    <Automatic-Module-Name>com.xxxxx.business.workflow.component.starter</Automatic-Module-Name>
                  </manifestEntries>
                </archive>
              </configuration>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories> 
</project>

Best Answer

Fixed!!!

The issue exists as spring fox libraries internally depend on spring-plugin-core:1.2.0 but it actually requires spring-plugin-core:2.0.0. This dependency correction seems to be missing in the SNAPSHOT version of the swagger libraries for supporting web flux.

We just need to correct Maven dependencies as given below and no code change is required:

  • Maven POM Dependencies fix
<dependency>
  <groupId>io.springfox</groupId>
  <artifactId>springfox-swagger2</artifactId>
  <version>3.0.0-SNAPSHOT</version>
  <exclusions>
    <exclusion>
      <groupId>org.springframework.plugin</groupId>
      <artifactId>spring-plugin-core</artifactId>
    </exclusion>
  </exclusions>
</dependency>
<dependency>
  <groupId>io.springfox</groupId>
  <artifactId>springfox-swagger-ui</artifactId>
  <version>3.0.0-SNAPSHOT</version>
</dependency>
<dependency>
  <groupId>io.springfox</groupId>
  <artifactId>springfox-spring-webflux</artifactId>
  <version>3.0.0-SNAPSHOT</version>
  <exclusions>
    <exclusion>
      <groupId>org.springframework.plugin</groupId>
      <artifactId>spring-plugin-core</artifactId>
    </exclusion>
  </exclusions>
</dependency>
<dependency>
  <groupId>org.springframework.plugin</groupId>
  <artifactId>spring-plugin-core</artifactId>
  <version>2.0.0.RELEASE</version>
</dependency>
  • Swagger Configuration: (Same as before just for reference)
    @Configuration
    @EnableSwagger2WebFlux
    public class SwaggerConfiguration {

        @Bean
        public Docket api(final TypeResolver typeResolver) {
            return new Docket(DocumentationType.SWAGGER_2)
                    .select()
                    .apis(RequestHandlerSelectors.any())
                    .paths(PathSelectors.any())
                    .build();
        }
    }
Related Topic