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

Question

I went through many links like - The following method did not exist: 'org.springframework.plugin.core.PluginRegistry org.springframework.plugin.core.PluginRegistry.of(java.util.List)', but still I am getting below error -
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
[2m2021-04-03 16:16:57.381[0;39m [31mERROR[0;39m [35m16532[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.s.b.d.LoggingFailureAnalysisReporter [0;39m [2m:[0;39m
***************************
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 org.springframework.plugin.core.PluginRegistry.of(java.util.List)'
The method's class, org.springframework.plugin.core.PluginRegistry, is available from the following locations:
jar:file:/C:/Users/pc/.m2/repository/org/springframework/plugin/spring-plugin-core/1.2.0.RELEASE/spring-plugin-core-1.2.0.RELEASE.jar!/org/springframework/plugin/core/PluginRegistry.class
The class hierarchy was loaded from the following locations:
org.springframework.plugin.core.PluginRegistry: file:/C:/Users/pc/.m2/repository/org/springframework/plugin/spring-plugin-core/1.2.0.RELEASE/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
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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.techefx.microservices</groupId>
<artifactId>techefx-property-access-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>techefx-property-access-service</name>
<description>My Property File Access Service</description>
<properties>
<java.version>14</java.version>
<spring-cloud.version>Hoxton.SR10</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.plugin</groupId>
<artifactId>spring-plugin-core</artifactId>
<version>2.0.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-rest-hal-explorer</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</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>
<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>
<configuration>
<source>13</source>
<target>13</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
application.yml
spring:
application:
name: techefx-property-access-service
profiles:
active: dev
server:
port: ${port:8100}
management:
endpoints:
web:
exposure:
include: refresh
The source code is here - https://github.com/techefx/techefx-property-access-service

Answer 1

Let's look at your dependency tree (mvn dependency:tree):
[INFO] +- org.springframework.plugin:spring-plugin-core:jar:2.0.0.RELEASE:compile
[INFO] | +- org.springframework:spring-beans:jar:5.2.9.RELEASE:compile
[INFO] | +- org.springframework:spring-context:jar:5.2.9.RELEASE:compile
[INFO] | +- org.springframework:spring-aop:jar:5.2.9.RELEASE:compile
...
[INFO] +- io.springfox:springfox-swagger2:jar:2.7.0:compile
[INFO] | +- io.swagger:swagger-annotations:jar:1.5.13:compile
[INFO] | +- io.swagger:swagger-models:jar:1.5.13:compile
[INFO] | +- io.springfox:springfox-spi:jar:2.7.0:compile
[INFO] | | \- io.springfox:springfox-core:jar:2.7.0:compile
[INFO] | +- io.springfox:springfox-schema:jar:2.7.0:compile
[INFO] | +- io.springfox:springfox-swagger-common:jar:2.7.0:compile
[INFO] | +- io.springfox:springfox-spring-web:jar:2.7.0:compile
[INFO] | | \- org.reflections:reflections:jar:0.9.11:compile
[INFO] | | \- org.javassist:javassist:jar:3.21.0-GA:compile
[INFO] | +- com.google.guava:guava:jar:29.0-jre:compile
[INFO] | | +- com.google.guava:failureaccess:jar:1.0.1:compile
[INFO] | | +- com.google.guava:listenablefuture:jar:9999.0-empty-to-avoid-conflict-with-guava:compile
[INFO] | | +- com.google.code.findbugs:jsr305:jar:3.0.2:compile
[INFO] | | +- org.checkerframework:checker-qual:jar:2.11.1:compile
[INFO] | | +- com.google.errorprone:error_prone_annotations:jar:2.3.4:compile
[INFO] | | \- com.google.j2objc:j2objc-annotations:jar:1.3:compile
[INFO] | +- com.fasterxml:classmate:jar:1.5.1:compile
[INFO] | +- org.springframework.plugin:spring-plugin-metadata:jar:1.2.0.RELEASE:compile
It appears springfox-swagger2 is pulling in spring-plugin-metadata:jar:1.2.0.RELEASE. That dependency requires spring-plugin-core:jar:1.2.0.RELEASE, which is skipped, because you explicitly requested to use a different version.
You will need to either:
Put an exclusion for spring-plugin-metadata inside the springfox-swagger2 dependency declaration, add an explicit dependency on spring-plugin-metadata:2.0.0.RELEASE, and hope spring-plugin-metadata:2.0.0.RELEASE and spring-plugin-metadata:1.2.0.RELEASE have compatible APIs (which they likely don't)
Change the dependency version of spring-plugin-core to 1.2.0.RELEASE