为什么maven无法收集另一个内部依赖项目？

时间：2014-03-08 08:34:42

标签： xml maven pom.xml

我的整个pom构造如下：

simple-parent2-|
               |-pom.xml
               |-simple-model2-|
                                pom.xml
               |-simple-weather2-|
                                pom.xml

simple-weather2取决于simple-model2

所以，simple-parent2 pom.xml遵循：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>kursk.practice.ch07</groupId>
  <artifactId>simple-parent2</artifactId>
  <version>1.1</version>
  <packaging>pom</packaging>

  <name>simple-parent2</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <modules>
     <module>simple-model2</module>
     <module>simple-weather2</module>
     <!--
     <module>simple-persist2</module>
     <module>simple-webapp2</module>
     <module>simple-command2</module>
     -->
  </modules>

  <build>
     <pluginManagement>
        <plugins>
           <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-compiler-plugin</artifactId>
              <configuration>
                 <source>1.5</source>
                 <target>1.5</target>
              </configuration>
           </plugin>
        </plugins>
     </pluginManagement>
  </build>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

simple-model2 pom.xml如下：

  <?xml version="1.0"?>
  <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>
    <parent>
      <groupId>kursk.practice.ch07</groupId>
      <artifactId>simple-parent2</artifactId>
      <version>1.1</version>
    </parent>
    <groupId>kursk.practice.ch07</groupId>
    <artifactId>simple-model2</artifactId>
    <version>1.1</version>
    <packaging>jar</packaging>
    <name>simple-model2</name>
    <url>http://maven.apache.org</url>
    <properties>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
     <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-annotations</artifactId>
        <version>3.3.0.ga</version>
     </dependency>
     <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-commons-annotations</artifactId>
        <version>3.3.0.ga</version>
     </dependency>
    </dependencies>
    </project>

simple-weather2 pom.xml如下所示，simple-model2是依赖项之一。

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>kursk.practice.ch07</groupId>
    <artifactId>simple-parent2</artifactId>
    <version>1.1</version>
  </parent>
  <groupId>kursk.practice.ch07</groupId>
  <artifactId>simple-weather2</artifactId>
  <version>1.1</version>
  <name>simple-weather2</name>
  <url>http://maven.apache.org</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
     <dependency>
        <groupId>kursk.practice.ch07</groupId>
        <artifactId>simple-model2</artifactId>
        <version>1.1</version>
     </dependency>
     <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.14</version>
     </dependency>
     <dependency>
        <groupId>dom4j</groupId>
        <artifactId>dom4j</artifactId>
        <version>1.6.1</version>
     </dependency>
     <dependency>
        <groupId>jaxen</groupId>
        <artifactId>jaxen</artifactId>
        <version>1.1.1</version>
     </dependency>
     <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-io</artifactId>
        <version>1.3.2</version>
        <scope>test</scope>
     </dependency>
  </dependencies>
</project>

首先，我安装了simple-model2，它的成功！

kursk@KURSK-PC /D/CodeSpace/maven/simple-parent2/simple-model2
$ mvn install
.....
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9.445s
[INFO] Finished at: Sat Mar 08 16:22:16 CST 2014
[INFO] Final Memory: 8M/122M
[INFO] ------------------------------------------------------------------------

第二，我执行依赖：simple-weather2文件夹上的树，但是maven报告无法收集simple-model2和simple-parent2！

kursk@KURSK-PC /D/CodeSpace/maven/simple-parent2/simple-weather2
$ mvn dependency:tree
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building simple-weather2 1.1
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.411s
[INFO] Finished at: Sat Mar 08 16:27:19 CST 2014
[INFO] Final Memory: 7M/122M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project simple-weather2: Could not resolve dependencies for project kursk.practice.ch07:simple-weather2:jar:1.1: Failed to collect de
pendencies at kursk.practice.ch07:simple-model2:jar:1.1: Failed to read artifact descriptor for kursk.practice.ch07:simple-model2:jar:1.1: Failure to find kursk.practi
ce.ch07:simple-parent2:pom:1.1 in http://dev.joget.org/archiva/repository/internal/ was cached in the local repository, resolution will not be reattempted until the up
date interval of joget-internal has elapsed or updates are forced -> [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

但我可以在我的本地存储库

中找到它们 
kursk@KURSK-PC /C/Users/kursk/.m2/repository/kursk/practice/ch07
$ ls -l
total 0
drwxr-xr-x    4 kursk    Administ        0 Mar  8 15:06 simple-model2
drwxr-xr-x    3 kursk    Administ        0 Mar  8 15:07 simple-parent2

我的步骤出了什么问题？为什么maven找不到内部依赖项目？

1 个答案:

答案 0 :(得分：0)

抱歉，这是我的错，我没有看过。现在，我明白了。

我没有从simple-parent2项目执行“mvn clean install”，因此simple-parent2和simple-model2 jar文件没有在本地缓存中找到。

从simple-parent2项目执行exec“mvn clean install”后，从simple-weather2项目执行“mvn dependency：tree”就行了！

所以，跟随文本是从“maven-definitive-guide”中提取的

  

当对具有子模块的项目执行Maven时，Maven首先加载   父POM并找到所有子模块POM。然后Maven提出了所有这些   将POM投射到一个叫做Maven Reactor的东西上，分析它   模块之间的依赖关系。 Reactor负责订购组件   确保以正确的顺序编译和安装相互依赖的模块。

     

注意：   Reactor保留POM中定义的模块顺序，除非   需要做出改变。对此有用的心理模型是图片   依赖兄弟项目的模块被“推下”   列表，直到满足依赖性排序。在极少数情况下，它   可能很方便重新排列构建的模块顺序 - 例如   如果你想要一个经常不稳定的模块朝着开始   建立。   100

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