!!!Spring Tool Suite Mavenでネットワークエラー
[Spring Tool Suite][Maven]

"" プロキシを使用している場合

!!たとえば、mvn -U clean で、以下のようなエラー

 [INFO] Scanning for projects...
 [INFO] ------------------------------------------------------------------------
 [INFO] Building Spring JPA Utility
 [INFO]    task-segment: [clean]
 [INFO] ------------------------------------------------------------------------
 Downloading: http://repository.codehaus.org//org/apache/maven/plugins/maven-clean-plugin/2.2/maven-clean-plugin-2.2.pom
 [WARNING] Unable to get resource 'org.apache.maven.plugins:maven-clean-plugin:pom:2.2' from repository Codehaus (http://repository.codehaus.org/): Error transferring file: repository.codehaus.org
 Downloading: http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.2/maven-clean-plugin-2.2.pom
 [WARNING] Unable to get resource 'org.apache.maven.plugins:maven-clean-plugin:pom:2.2' from repository central (http://repo1.maven.org/maven2): Error transferring file: repo1.maven.org
 Downloading: http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/rt/eclipselink/maven.repo/org/apache/maven/plugins/maven-clean-plugin/2.2/maven-clean-plugin-2.2.pom
 [WARNING] Unable to get resource 'org.apache.maven.plugins:maven-clean-plugin:pom:2.2' from repository EclipseLink Repo (http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/rt/eclipselink/maven.repo): Error transferring file: www.eclipse.org
 Downloading: http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.2/maven-clean-plugin-2.2.pom
 [WARNING] Unable to get resource 'org.apache.maven.plugins:maven-clean-plugin:pom:2.2' from repository central (http://repo1.maven.org/maven2): Error transferring file: repo1.maven.org
 [INFO] ------------------------------------------------------------------------
 [ERROR] BUILD ERROR
 [INFO] ------------------------------------------------------------------------
 [INFO] Error building POM (may not be this project's POM).
                   :

!!Eclipse のプロキシ設定を行っても解決しない
{{ref_image sts_proxy00.jpg}}
{{ref_image sts_proxy01.jpg}}
!!直接Mavenの設定ファイルを編集する
*C:\springsource\maven-2.2.1.RELEASE\conf\settings.xml
  <proxies>
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <!--username>proxyuser</username -->
      <!--password>proxypass</password -->
      <host>192.168.99.99</host>
      <port>8080</port>
      <nonProxyHosts>127.0.0.1</nonProxyHosts>
    </proxy>
  </proxies>

!!さらに、編集したファイルをSTSのプロパティから指定する
*上記だけだと、Missing artifactエラーがたくさん出る(STS上からの利用に反映されていないので当然か)
*Maven - User Sttings に上記のsettings.xmlを指定
""もしくは上記のsettings.xmlをローカルリポジトリ(%ユーザーディレクトリ%\.m2\setting.xml)にコピーして使用
{{ref_image maven_setting.jpg}}