新建maven项目时出现这些错误
Unresolved plugin: 'org.apache.maven.plugins:maven-clean-plugin:2.5'
Unresolved plugin: 'org.apache.maven.plugins:maven-resources-plugin:2.6'
Unresolved plugin: 'org.apache.maven.plugins:maven-jar-plugin:2.4'
Unresolved plugin: 'org.apache.maven.plugins:maven-compiler-plugin:3.1'
Unresolved plugin: 'org.apache.maven.plugins:maven-surefire-plugin:2.12.4'
Unresolved plugin: 'org.apache.maven.plugins:maven-install-plugin:2.4'
Unresolved plugin: 'org.apache.maven.plugins:maven-deploy-plugin:2.7'
Unresolved plugin: 'org.apache.maven.plugins:maven-site-plugin:3.3'
