maven 在build的时候，hung在最后一行了，有人知道为啥么？错误如下：
[root@compute000 ambari-web]# mvn -B clean install -DnewVersion=2.1.0.0 -DskipTests -Dpython.ver="python >= 2.6"
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Ambari Web 2.0.0.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ ambari-web ---
[INFO] Deleting /root/wangxu/ambari/ambari-web/target
[INFO] Deleting /root/wangxu/ambari/ambari-web (includes = [**/*.pyc], excludes = [])
[INFO]
[INFO] --- build-helper-maven-plugin:1.8:parse-version (parse-version) @ ambari-web ---
[INFO]
[INFO] --- build-helper-maven-plugin:1.8:regex-property (regex-property) @ ambari-web ---
[INFO]
[INFO] --- build-helper-maven-plugin:1.8:regex-property (parse-package-version) @ ambari-web ---
[INFO]
[INFO] --- build-helper-maven-plugin:1.8:regex-property (parse-package-release) @ ambari-web ---
[INFO]
[INFO] --- apache-rat-plugin:0.11:check (default) @ ambari-web ---
[INFO] 51 implicit excludes (use -debug for more details).
[INFO] No excludes explicitly specified.
[INFO] 8954 resources included (use -debug for more details)
Warning: org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser: Property 'http://www.oracle.com/xml/jaxp/properties/entityExpansionLimit' is not recognized.
Warning: org.apache.xerces.parsers.SAXParser: Feature 'http://javax.xml.XMLConstants/feature/secure-processing' is not recognized.
Warning: org.apache.xerces.parsers.SAXParser: Property 'http://www.oracle.com/xml/jaxp/properties/entityExpansionLimit' is not recognized.