每次使用Maven Glassfish插件重新部署应用程序时，都会收到此警告。为什么？如何阻止，部署需要很长时间。
Downloading: http://maven.ocean.net.au/release/org/apache/maven/maven-plugin-api/maven-metadata.xml
Downloading: http://maven.ocean.net.au/external/org/apache/maven/maven-plugin-api/maven-metadata.xml
Downloading: http://download.java.net/maven/2/org/apache/maven/maven-plugin-api/maven-metadata.xml
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/maven-plugin-api/maven-metadata.xml
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/maven-plugin-api/maven-metadata.xml (2 KB at 4.7 KB/sec)
Downloading: http://maven.ocean.net.au/snapshot/org/apache/maven/maven-plugin-api/maven-metadata.xml
Downloading: http://download.java.net/maven/2/org/apache/maven/maven-plugin-api/maven-metadata.xml
[WARNING] Could not transfer metadata org.apache.maven:maven-plugin-api/maven-metadata.xml from/to release.ocean.net.au (http://maven.ocean.net.au/release): maven.ocean.net.au
[WARNING] Could not transfer metadata org.apache.maven:maven-plugin-api/maven-metadata.xml from/to external.ocean.net.au (http://maven.ocean.net.au/external): maven.ocean.net.au
[WARNING] Could not transfer metadata org.apache.maven:maven-plugin-api/maven-metadata.xml from/to snapshot.ocean.net.au (http://maven.ocean.net.au/snapshot): maven.ocean.net.au