如何让Eclipse和Maven下载我需要的JAR？ [英] How do I get Eclipse and Maven to download the JARs I need?

问题描述

我很熟悉Maven和Eclipse。我们一直在使用Netbeans并在我们的项目中手动安装jar。

我认为Maven的目的是根据您的依赖关系下载所需的jar？

在一个新项目中，我在我的pom.xml文件的依赖项节点下添加了以下内容：

 <！ -  Java依赖关系 - > 
<依赖关系> 
< groupId> javax.annotation< / groupId> 
< artifactId> com.springsource.javax.annotation< / artifactId> 
< / dependency> 
 
<！ -  Spring依赖关系 - > 
<依赖关系> 
< groupId> org.springframework< / groupId> 
< artifactId> org.springframework.orm< / artifactId> 
< / dependency> 
 
<！ -  Spring安全性依赖关系 - > 
<依赖关系> 
< groupId> org.springframework.security< / groupId> 
< artifactId> org.springframework.security.config< / artifactId> 
< / dependency> 
<依赖关系> 
< groupId> org.springframework.security< / groupId> 
< artifactId> org.springframework.security.core< / artifactId> 
< / dependency> 
<依赖关系> 
< groupId> org.springframework.security< / groupId> 
< artifactId> org.springframework.security.taglibs< / artifactId> 
< / dependency> 
<依赖关系> 
< groupId> org.springframework.security< / groupId> 
< artifactId> org.springframework.security.web< / artifactId> 
< / dependency> 
 
<！ - 其他依赖关系 - > 
<依赖关系> 
< groupId> com.mysql.jdbc< / groupId> 
< artifactId> com.springsource.com.mysql.jdbc< / artifactId> 
< scope>运行时< / scope> 
< / dependency> 
<依赖关系> 
< groupId> org.apache.commons< / groupId> 
< artifactId> com.springsource.org.apache.commons.dbcp< / artifactId> 
< scope>运行时< / scope> 
< / dependency> 
  

但我所得到的是：

项目构建错误：javax.annotation的dependencies.dependency.version：com.springsource.javax.annotation：jar缺少。

....

我做错了什么？

解决方案

依赖块几乎总是需要一个版本号。如果您在 http://search.maven.org/ 上搜索您的依赖项，您应该可以浏览关于使用完整的依赖关系的依赖关系的页面。

例如，Spring Security的页面是：

http：// search.maven.org/#artifactdetails|org.springframework.security|spring-security-aspects|3.1.0.RELEASE|jar

依赖关系块它看起来像：

 <依赖关系> 
< groupId> org.springframework.security< / groupId> 
< artifactId> spring-security-aspects< / artifactId> 
< version> 3.1.0.RELEASE< / version> 
< / dependency> 
  

I'm new to Maven and Eclipse. We have been using Netbeans and installing jars manually in our projects.

I thought the purpose of Maven was to download the required jars based on your dependencies?

In a new project, I added the following under my dependencies node of my pom.xml file:

    <!-- Java dependencies -->
    <dependency>
        <groupId>javax.annotation</groupId>
        <artifactId>com.springsource.javax.annotation</artifactId>
    </dependency>

    <!-- Spring dependencies -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>org.springframework.orm</artifactId>
    </dependency>

    <!-- Spring Security dependencies -->
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>org.springframework.security.config</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>org.springframework.security.core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>org.springframework.security.taglibs</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>org.springframework.security.web</artifactId>
    </dependency>

    <!-- Other dependencies -->
    <dependency>
        <groupId>com.mysql.jdbc</groupId>
        <artifactId>com.springsource.com.mysql.jdbc</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>com.springsource.org.apache.commons.dbcp</artifactId>
        <scope>runtime</scope>
    </dependency>

But all I get is:

Project build error: 'dependencies.dependency.version' for javax.annotation:com.springsource.javax.annotation:jar is missing.

....

What am I doing wrong?

解决方案

Dependency blocks almost always need a version number. If you search for your dependencies on http://search.maven.org/, you should be able to navigate to a page about the dependency with a complete dependency block.

For example, the page for Spring Security is:

http://search.maven.org/#artifactdetails|org.springframework.security|spring-security-aspects|3.1.0.RELEASE|jar

The dependency block for it looks like:

<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-aspects</artifactId>
    <version>3.1.0.RELEASE</version>
</dependency>

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