如何让Eclipse和Maven下载我需要的JAR？

Question

我是Maven和Eclipse的新手.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项下载所需的jar？

在一个新项目中,我在我dependencies的pom.xml文件的节点下添加了以下内容:

    <!-- 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>

但我得到的只是:

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

....

我究竟做错了什么？

Answer 1

依赖块几乎总是需要版本号.如果您在http://search.maven.org/上搜索依赖项,则应该能够使用完整的依赖项块导航到有关依赖项的页面.

例如,Spring Security的页面是:

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

它的依赖块看起来像:

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