maven多模块工程的优化原则

1. 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  
2.     父模块定义如下：  
3.     <properties>  
4.       
5.         <hibernate.annotations.version>3.3.0.ga</hibernate.annotations.version>  
6.       
7.         <hsqldb.version>1.8.0.7</hsqldb.version>  
8.     
9.     </properties>  
10.     <dependencyManagement>  
11.         <dependencies>  
12.             <dependency>  
13.                 <groupId>org.hibernate</groupId>  
14.                 <artifactId>hibernate-annotations</artifactId>  
15.                 <version>${hibernate.annotations.version}</version>  
16.             </dependency>  
17.             <dependency>  
18.                 <groupId>org.hibernate</groupId>  
19.                 <artifactId>hibernate-commons-annotations</artifactId>  
20.                 <version>${hibernate.annotations.version}</version>  
21.             </dependency>  
22.         <dependencies>  
23.     <dependencyManagement>  
24.     子模块中定义如下：  
25.     <dependencies>  
26.         <dependency>  
27.             <groupId>${project.groupId}</groupId>  
28.             <artifactId>simple-model</artifactId>  
29.             <version>${project.version}</version>  
30.         </dependency>  
31.         <dependency>  
32.             <groupId>org.hibernate</groupId>  
33.             <artifactId>hibernate</artifactId>  
34.         </dependency>  
35.         <dependency>  
36.             <groupId>org.hibernate</groupId>  
37.             <artifactId>hibernate-annotations</artifactId>  
38.         </dependency>  
39.         <dependency>  
40.             <groupId>org.hibernate</groupId>  
41.             <artifactId>hibernate-commons-annotations</artifactId>  
42.         </dependency>  
43.         <dependency>  
44.             <groupId>org.apache.geronimo.specs</groupId>  
45.             <artifactId>geronimo-jta_1.1_spec</artifactId>  
46.             <version>1.1</version>  
47.         </dependency>  
48.         <dependency>  
49.             <groupId>org.springframework</groupId>  
50.             <artifactId>spring</artifactId>  
51.         </dependency>  
52.     </dependencies>  
53. 2、子模块都应用父模块的grouId和version，  
54.   
55.     <parent>  
56.         <groupId>org.sonatype.mavenbook</groupId>  
57.         <artifactId>simple-parent</artifactId>  
58.         <version>1.0</version>  
59.         <!-- 如果没有该属性则该工程必须放到simpe-parent下-->  
60.         <relativePath>../simple-parent/pom.xml</relativePath>  
61.     </parent>  
62.   
63.     <artifactId>simple-persist</artifactId>  
64.     <packaging>jar</packaging>  
65.   
66.     同时，该模块依赖其他模块时采用如下方式配置：  
67.     <dependency>  
68.         <groupId>${project.groupId}</groupId>  
69.         <artifactId>simple-model</artifactId>  
70.         <version>${project.version}</version>  
71.     </dependency>  
72. 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。