Maven - 이클립스 Maven 연동 시 plug in 에러 날 경우

Multiple annotations found at this line:
- Execution default-testResources of goal org.apache.maven.plugins:maven-resources-          plugin:2.4.3:testResources failed: 
 Plugin org.apache.maven.plugins:maven-resources-plugin:2.4.3 or one of its dependencies could not be resolved: Failed to collect 
 dependencies for org.apache.maven.plugins:maven-resources-plugin:jar:2.4.3 () (org.apache.maven.plugins:maven-resources-
 plugin:2.4.3:testResources:default-testResources:process-test-resources)
- Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile 
 (execution: default-compile, phase: compile)
- CoreException: Could not get the value for parameter compilerId for plugin execution default-compile: 
 PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:2.3.2 or one of its dependencies could not be 
 resolved: Failed to collect dependencies for org.apache.maven.plugins:maven-compiler-plugin:jar:2.3.2 (): 
 ArtifactDescriptorException: Failed to read artifact descriptor for org.apache.maven:maven-plugin-api:jar:2.0.6: 
 ArtifactResolutionException: Failure to transfer org.apache.maven:maven-plugin-api:pom:2.0.6 from http://repo1.maven.org/
 maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or 
 updates are forced. Original error: Could not transfer artifact org.apache.maven:maven-plugin-api:pom:2.0.6 from/to central (http://
 repo1.maven.org/maven2): null to http://repo1.maven.org/maven2/org/apache/maven/maven-plugin-api/2.0.6/maven-plugin-
 api-2.0.6.pom
- CoreException: Could not get the value for parameter compilerId for plugin execution default-testCompile: 
 PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:2.3.2 or one of its dependencies could not be 
 resolved: Failed to collect dependencies for org.apache.maven.plugins:maven-compiler-plugin:jar:2.3.2 (): 
 ArtifactDescriptorException: Failed to read artifact descriptor for org.apache.maven:maven-plugin-api:jar:2.0.6: 
 ArtifactResolutionException: Failure to transfer org.apache.maven:maven-plugin-api:pom:2.0.6 from http://repo1.maven.org/
 maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or 
 updates are forced. Original error: Could not transfer artifact org.apache.maven:maven-plugin-api:pom:2.0.6 from/to central (http://
 repo1.maven.org/maven2): null to http://repo1.maven.org/maven2/org/apache/maven/maven-plugin-api/2.0.6/maven-plugin-
 api-2.0.6.pom
- Execution default-resources of goal org.apache.maven.plugins:maven-resources-plugin:2.4.3:resources failed: Plugin 
 org.apache.maven.plugins:maven-resources-plugin:2.4.3 or one of its dependencies could not be resolved: Failed to collect 
 dependencies for org.apache.maven.plugins:maven-resources-plugin:jar:2.4.3 () (org.apache.maven.plugins:maven-resources-
 plugin:2.4.3:resources:default-resources:process-resources)
- Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-plugin:
 2.3.2:testCompile (execution: default-testCompile, phase: test-compile)

대략 이런 에러가 발생했을 경우.
POM.xml을 확인해보면

<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/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.lala.sarasa</groupId>
   <artifactId>msrdecision</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>msrdecision Maven Webapp</name>
  <url>http://maven.apache.org</url>
 <dependencies>
   <dependency>
     <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>hello</finalName>
   </build>
 </project>
이렇게 되어 있을 것이고,
해결방법은 POM.xml에
<dependency>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <version>2.4.3</version>
</dependency>

이런식으로 디펜던시를 추가해주면 된다.(현재 날짜 기준으로 최신버전인 3.2.1은 되지 
않는다.)

이렇게 작성해준 뒤에, 

1. 프로젝트 우클릭 > Run As > Maven Install

2. 이클립스 프로젝트 탐색기에서 해당 프로젝트 클릭 후 F5(새로고침)

3. 프로젝트 우클릭 > Maven > Update Project 

끝!