org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

Problem

org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

This issue happens due to version mismatch between swaggerfox and spring boot framework.

Solution

/**

 * @author aswathi sajeevan

 *

 */

@Configuration

@EnableSwagger2

public class SwaggerConfig {

@Bean

public Docket api() {

return new Docket(DocumentationType.SWAGGER_2).select().apis(RequestHandlerSelectors.any())

.paths(PathSelectors.any()).build();

}

}

Pom.xml

<!--  swagger  -->

<dependency>

<groupId>io.springfox</groupId>

<artifactId>springfox-boot-starter</artifactId>

<version>3.0.0</version>

</dependency>

<dependency>

<groupId>io.springfox</groupId>

<artifactId>springfox-swagger-ui</artifactId>

<version>3.0.0</version>

</dependency>

Spring boot version

<parent>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>2.7.2-SNAPSHOT</version>

<relativePath /> <!-- lookup parent from repository -->

</parent>

Swagger url

http://localhost:9090/swagger-ui/index.html