Spring boot Swagger implementation using Spring Fox Failed to start bean 'documentationPluginsBootstrapper'

Question

I am using the Springfox jars for implementation of swagger in my spring boot project the gradle dependencies look like:

dependencies {
compile group: 'org.springframework.boot', name: 'spring-boot-starter-webflux', version: '2.1.3.RELEASE'
compile group: 'org.springframework.boot', name: 'spring-boot-configuration-processor', version: '2.1.3.RELEASE'
testCompile group: 'org.springframework.boot', name: 'spring-boot-starter-test', version: '2.1.3.RELEASE'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: '2.1.3.RELEASE'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-rest', version: '2.1.3.RELEASE'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: '2.1.3.RELEASE'
implementation 'org.flywaydb:flyway-core'
compileOnly 'org.projectlombok:lombok'
runtimeOnly 'org.hsqldb:hsqldb'
annotationProcessor 'org.projectlombok:lombok'
testImplementation 'io.projectreactor:reactor-test'
compile group: 'org.postgresql', name: 'postgresql', version: '42.2.5'
testImplementation 'junit:junit:4.12'
testImplementation 'org.hamcrest:hamcrest-library:1.3'
compile group: 'io.springfox', name: 'springfox-swagger2', version: '2.9.1'
    compile group: 'io.springfox', name: 'springfox-swagger-ui', version: '2.9.1'
    //compile group: 'io.springfox', name: 'springfox-data-rest', version: '2.9.1'
    // Unit testing dependencies
    // Set this dependency if you want to use Hamcrest matching

}

The Swagger config file:

package com.myapp.config;

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.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@EnableSwagger2
@Configuration
public class SwaggerConfig {

    @Bean
    public Docket api() {
        return new Docket(DocumentationType.SWAGGER_2).select()
                .apis(RequestHandlerSelectors.basePackage("com.mypackage.rtp.controller"))
                .paths(PathSelectors.regex("/.*")).build().apiInfo(apiEndPointsInfo());
    }

    private ApiInfo apiEndPointsInfo() {
        return new ApiInfoBuilder().title("Spring Boot REST API").description("Employee Management REST API")
                .license("Apache 2.0").licenseUrl("http://www.apache.org/licenses/LICENSE-2.0.html").version("1.0.0")
                .build();
    }

}

While i do a spring bootRun i am getting the below warning:

WARN  [main] org.springframework.context.support.AbstractApplicationContext: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NoSuchMethodError: org.springframework.plugin.core.PluginRegistry.getPluginFor(Ljava/lang/Object;Lorg/springframework/plugin/core/Plugin;)Lorg/springframework/plugin/core/Plugin;

and the server exits with :

***************************
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:

    org.springframework.data.rest.core.support.UnwrappingRepositoryInvokerFactory.<init>(UnwrappingRepositoryInvokerFactory.java:57)

The following method did not exist:

    org.springframework.plugin.core.PluginRegistry.of(Ljava/util/List;)Lorg/springframework/plugin/core/PluginRegistry;

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

    jar:file:/C:/Users/vgoswami/.gradle/caches/modules-2/files-2.1/org.springframework.plugin/spring-plugin-core/1.2.0.RELEASE/f380e7760032e7d929184f8ad8a33716b75c0657/spring-plugin-core-1.2.0.RELEASE.jar!/org/springframework/plugin/core/PluginRegistry.class

It was loaded from the following location:

    file:/C:/Users/vgoswami/.gradle/caches/modules-2/files-2.1/org.springframework.plugin/spring-plugin-core/1.2.0.RELEASE/f380e7760032e7d929184f8ad8a33716b75c0657/spring-plugin-core-1.2.0.RELEASE.jar


Action:

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

Any help on the same would be highly appreciated...

Answer 1

I had the same issue and after long time messing around with spring-core, swagger etc i found that below dependency was actual culprit

spring-boot-starter-data-rest

Just remove this and you are done.