maven bug之Maven：Non-resolvable parent POM: Failure to find错误
使用Maven编译淘宝的TimeTunnel项目时遇到如下错误：
[INFO] Scanning for projects...
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project com.taobao:timetunnel-client:0.2.0-SNAPSHOT (E:\MyWork\TimeTunnel\time
lient\Java\pom.xml) has 1 error
[ERROR] Non-resolvable parent POM: Failure to find com.taobao:timetunnel:pom:0.2.0-SNAPS
ttp://192.168.169.48:6677/nexus/content/groups/public/ was cached in the local repository, r
n will not be reattempted until the update interval of nexus has elapsed or updates are forc
parent.relativePath' points at wrong local POM @ line 4, column 10 -> [Help 2]
[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 follow
cles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException
由提示可知是parent.relativePath出错。解决办法如下：
<parent>
<artifactId>timetunnel</artifactId>
<groupId>com.taobao</groupId>
<version>0.2.0-SNAPSHOT</version>
<relativePath>../../pom.xml</relativePath>
</parent>
<groupId>com.taobao</groupId>
<artifactId>timetunnel-client</artifactId>
<version>0.2.0-SNAPSHOT</version>
由<relativePath>../../pom.xml</relativePath>指定正确的父pom路径，默认为../pom.xml。
详细信息：
The relative path of the parent pom.xml file within the check out. If not specified, it defaults to ../pom.xml. Maven looks for the parent POM first in this location on the filesystem, then the local repository, and lastly in the remote repo. relativePath allows you to select a different location, for example when your structure is flat, or deeper without an intermediate parent POM. However, the group ID, artifact ID and version are still required, and must match the file in the location given or it will revert to the repository for the POM. This feature is only for enhancing the development in a local checkout of that project. Set the value to an empty string in case you want to disable the feature and always resolve the parent POM from the repositories.
Default value is: ../pom.xml.
详见：http://maven.apache.org/ref/3.0.3/maven-model/maven.html#class_parent
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