Java Maven快照不起作用，我不认为

我正在尝试遵循本教程：

我想我在这方面遇到了问题。当我为

myApp

目录中的项目运行

pom.xml

时，我收到以下输出：

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building myApp 1
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for com.companyname.bank:consumerBanking:jar:1.0-SNAPSHOT is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ myApp ---
[INFO] Deleting C:\Users\name\Desktop\MavenFoo1\myApp\target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ myApp ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\Users\name\Desktop\MavenFoo1\myApp\src\main\resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ myApp ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 1 source file to C:\Users\name\Desktop\MavenFoo1\myApp\target\classes
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ myApp ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\Users\name\Desktop\MavenFoo1\myApp\src\test\resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ myApp ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 1 source file to C:\Users\name\Desktop\MavenFoo1\myApp\target\test-classes
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ myApp ---
[INFO] Surefire report directory: C:\Users\name\Desktop\MavenFoo1\myApp\target\surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.companyname.appid.AppTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.002 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO] 
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ myApp ---
[INFO] Building jar: C:\Users\name\Desktop\MavenFoo1\myApp\target\myApp-1.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.141 s
[INFO] Finished at: 2015-02-25T15:29:16-06:00
[INFO] Final Memory: 10M/26M
[INFO] ------------------------------------------------------------------------

我认为，

[INFO]Building myApp 1

正下方的警告消息意味着，

myApp

pom.xml没有成功捕获它在pom.xml中调用的另一个模块的最新快照

快照功能应允许另一个模块为第一个模块所依赖的不同模块获取最新版本的构建

<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>com.companyname.bank</groupId>
  <artifactId>consumerBanking</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>consumerBanking</name>
  <url>http://maven.apache.org</url>

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

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

    <dependency>
       <groupId>c3p0-0.9.1.1</groupId>
       <artifactId>c3p0-0.9.1.1</artifactId>
       <scope>system</scope>
       <version>1.0</version>
       <systemPath>${basedir}\src\lib\c3p0-0.9.1.1.jar</systemPath>
    </dependency>


  </dependencies>
</project>

下面是我的第一个项目

myApp

的

pom.xml

，它取决于另一个项目的最新版本

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.companyname.appid</groupId>
  <artifactId>myApp</artifactId>
  <packaging>jar</packaging>
  <version>1</version>
  <name>myApp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>com.companyname.bank</groupId>
      <artifactId>consumerBanking</artifactId>
      <version>1.0-SNAPSHOT</version>
      <scope>test</scope> 

    </dependency>

  </dependencies>
</project>

有人知道我为什么收到警告吗？这是否意味着快照功能无法正常工作？我所指的信息是：

“POM com.companyname.bank:consumerBanking:jar:1.0-SNAPSHOT是 无效的可传递依赖项（如果有）将不可用， 启用调试日志以了解更多详细信息”

感谢您阅读所有这些

问候,

---

me

我想Maven认为您的依赖项POM无效，因为这一部分没有意义：

<dependency>
   <groupId>c3p0-0.9.1.1</groupId>
   <artifactId>c3p0-0.9.1.1</artifactId>
   <scope>system</scope>
   <version>1.0</version>
   <systemPath>${basedir}\src\lib\c3p0-0.9.1.1.jar</systemPath>
</dependency>

c3p0-0.9.1.1
c3p0-0.9.1.1
系统
1
${basedir}\src\lib\c3p0-0.9.1.1.jar

有关详细信息，您是否尝试启用调试日志记录？这是命令行中的“mvn-X”。如果您是在某个IDE中执行Maven，您可能也会提到这一点。许多用于IDE的Maven插件并没有忠实地再现您在命令行中看到的行为。感谢您提供的有用反馈。我实际上没有使用IDE，而是从命令行运行它：你也可以参考这个有用的问题。。这会处理警告消息，但我没有看到在Maven

mvn clean package-U

命令期间，

myApp

pom.xml文件实际上正在下载依赖项。在本教程中，Maven的输出显示依赖项已下载。以下是从教程中复制的几行内容：

[INFO]构建消费者银行

[INFO]任务段：[清理，打包]

[INFO]-------------------------------------------------------------

[INFO]下载数据服务：1.0-SNAPSHOT

[INFO]290K下载。