maven 中maven dependencies中依賴出現了項目，把依賴的項目關掉，項目消失，但是還是無法打包 ，出現的錯誤如圖。說明:依賴的項目為project-dao 打包的項目為project-service 都在project-parent中有依賴。
project-dao是可以打包成功的。project-service中依賴dao的jar包也可以過 來。
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building project-service 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
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[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.507s
[INFO] Finished at: Thu May 22 09:45:55 CST 2014
[INFO] Final Memory: 4M/15M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project project-service: Could not resolve dependencies for project com.newhero.project:project-service:jar:0.0.1-SNAPSHOT: Failed to collect dependencies for [com.newhero.project:project-dao:jar:0.0.1-SNAPSHOT (compile?)]: Failed to read artifact descriptor for com.newhero.project:project-dao:jar:0.0.1-SNAPSHOT: Could not find artifact com.newhero.project:project-parent:pom:0.0.1-SNAPSHOT -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
解決問題的方法：需要把parent工程，也就是package是pom的那個工程先install一下。
解決問題連接：http://www.oschina.net/question/143808_156035