maven多模块工程的优化原则

 1、将各个工程中用到的重复jar包提取到parent的pom.xml中，通过properties属性标注版本信息,子模块只记录jar包，而不记录版本号
     父模块定义如下：
     <properties>

         <hibernate.annotations.version>3.3.0.gahibernate.annotations.version>

         <hsqldb.version>1.8.0.7hsqldb.version>

     properties>
     <dependencyManagement>
         <dependencies>
             <dependency>
                 <groupId>org.hibernategroupId>
                 <artifactId>hibernate-annotationsartifactId>
                 <version>${hibernate.annotations.version}version>
             dependency>
             <dependency>
                 <groupId>org.hibernategroupId>
                 <artifactId>hibernate-commons-annotationsartifactId>
                 <version>${hibernate.annotations.version}version>
             dependency>
         <dependencies>
     <dependencyManagement>
     子模块中定义如下：
     <dependencies>
         <dependency>
             <groupId>${project.groupId}groupId>
             <artifactId>simple-modelartifactId>
             <version>${project.version}version>
         dependency>
         <dependency>
             <groupId>org.hibernategroupId>
             <artifactId>hibernateartifactId>
         dependency>
         <dependency>
             <groupId>org.hibernategroupId>
             <artifactId>hibernate-annotationsartifactId>
         dependency>
         <dependency>
             <groupId>org.hibernategroupId>
             <artifactId>hibernate-commons-annotationsartifactId>
         dependency>
         <dependency>
             <groupId>org.apache.geronimo.specsgroupId>
             <artifactId>geronimo-jta_1.1_specartifactId>
             <version>1.1version>
         dependency>
         <dependency>
             <groupId>org.springframeworkgroupId>
             <artifactId>springartifactId>
         dependency>
     dependencies>
 2、子模块都应用父模块的grouId和version，

     <parent>
         <groupId>org.sonatype.mavenbookgroupId>
         <artifactId>simple-parentartifactId>
         <version>1.0version>

         <relativePath>../simple-parent/pom.xmlrelativePath>
     parent>

     <artifactId>simple-persistartifactId>
     <packaging>jarpackaging>

     同时，该模块依赖其他模块时采用如下方式配置：
     <dependency>
         <groupId>${project.groupId}groupId>
         <artifactId>simple-modelartifactId>
         <version>${project.version}version>
     dependency>
 3、采用mvn dependency:analyze将每个工程中的间接依赖添加到每个模块的工程中。