install子pom，无法找到父pom，进而导致找不到依赖jar包

项目目录结构如图：

图片说明
dal

在打包一个子项目，install 子pom时报错，如下：

[DEBUG] =======================================================================
[DEBUG] Could not find metadata com.dnt.nrc:nrc-service-root:2.0.0-SNAPSHOT/maven-metadata.xml in local (C:\Users\hazyhao\.m2\repository)
[DEBUG] Dependency collection stats: {ConflictMarker.analyzeTime=1, ConflictMarker.markTime=0, ConflictMarker.nodeCount=58, ConflictIdSorter.graphTime=0, ConflictIdSorter.topsortTime=1, ConflictIdSorter.conflictIdCount=30, ConflictIdSorter.conflictIdCycleCount=0, ConflictResolver.totalTime=13, ConflictResolver.conflictItemCount=46, DefaultDependencyCollector.collectTime=1212, DefaultDependencyCollector.transformTime=18}
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.141 s
[INFO] Finished at: 2019-02-22T00:00:19+08:00
[INFO] Final Memory: 9M/153M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project common-dal: Could not resolve dependencies for project com.dnt.nrc:common-dal:jar:2.0.0-SNAPSHOT: Failed to collect dependencies at com.dnt.nrc:common-domain:jar:2.0.0-SNAPSHOT: Failed to read artifact descriptor for com.dnt.nrc:common-domain:jar:2.0.0-SNAPSHOT: Could not find artifact com.dnt.nrc:nrc-service-root:pom:2.0.0-SNAPSHOT -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal on project common-dal: Could not resolve dependencies for project com.dnt.nrc:common-dal:jar:2.0.0-SNAPSHOT: Failed to collect dependencies at com.dnt.nrc:common-domain:jar:2.0.0-SNAPSHOT
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:220)
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:127)

子pom中明明指定了父pom的位置，还是找不到父pom

    <parent>
        <groupId>com.dnt.nrc</groupId>
        <artifactId>nrc-service-root</artifactId>
        <version>2.0.0-SNAPSHOT</version>
        <relativePath>../../pom.xml</relativePath>
    </parent>

进而导致报错说找不到依赖jar包，

求教各位师傅，是否遇到过类似问题。

https://blog.csdn.net/Michelhang/article/details/78338570

打开你的主pom文件。最先边选择Dependency Hierarchy 在里面进行一个搜索，然后把相对应的jar包看一下位置，或者看看加载上没
。如果没有，在右键项目-update一下jar，然后再试试。

在父项目build、install就可以了

通过设置mvn参数构建：https://blog.csdn.net/yanjunlu/article/details/39177115
mvn install -pl pingjuan-web -am
或
mvn install -pl pingjuan-web -am -amd

应该先构建父项目，再构建子项目。因为子项目依赖于父项目

都不行，依然报错，不知道怎么搞， 有没有demo可以参考的， 请允许我偷懒一回