今天突然下回顾以下Maven的聚合项目搭建,因为我们平时大多都是公司已经搭好的项目,平时自己也知道原理,但有时不去实践一下,你根本不知道,你是否会。
我有时候会比较膨胀,觉得这也没什么跟着网上文章搭建一下就好了,应该就能成功,没必要去搭建,但经历告诉我,实践出真知,比空头下要好多了
搭建的时候没遇到多少问题,唯一碰到的问题就是
[ERROR] Failed to execute goal on project Mavens-service: Could not resolve dependencies for project com.wm:Mavens-service:jar:1.0-SNAPSHOT: Failed to collect dependencies at com.wm:Mavens-core:jar:1.0-SNAPSHOT: Failed to read artifact descriptor for com.wm:Mavens-core:jar:1.0-SNAPSHOT: Could not find artifact com.wm:Mavens-parent:pom:1.0-SNAPSHOT -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
主:Mavens-parent
子:Mavens-core,Mavens-service,Mavens-web
这里Mavens-service依赖Mavens-core,Mavens-core 我已经install 进仓库了,为什么还会报这样的错误呢
通过查找,最终是找到了解决方法,是因为我还没有安装Mavens-parent导致,安装完Mavens-parent后在进行Mavens-service的安装就没有问题了。
在此,我顺便记录一下几个pom文件
Mavens-parent:
<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.wm</groupId>
<artifactId>Mavens-parent</artifactId>
<version>1.0-SNAPSHOT</version>
<modules>
<module>Mavens-web</module>
<module>Mavens-core</module>
<module>Mavens-service</module>
</modules>
<packaging>pom</packaging>
<name>Mavens-parent</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<junit.version>4.11</junit.version>
<spring.version>4.1.7.RELEASE</spring.version>
</properties>
<dependencyManagement>
<dependencies>
<!-- hibernate4 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.2.5.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.2.5.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>4.2.5.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.37</version>
</dependency>
<dependency>
<groupId>com.wm</groupId>
<artifactId>Mavens-service</artifactId>
<version>1.0-SNAPSHOT</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.wm</groupId>
<artifactId>Mavens-core</artifactId>
<version>1.0-SNAPSHOT</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.openejb</groupId>
<artifactId>javaee-api</artifactId>
<version>5.0-1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
</project>
Mavens-core:
<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">
<parent>
<artifactId>Mavens-parent</artifactId>
<groupId>com.wm</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>Mavens-core</artifactId>
<packaging>jar</packaging>
<name>Mavens-core</name>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
</dependency>
</dependencies>
</project>
Mavens-service
<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">
<parent>
<artifactId>Mavens-parent</artifactId>
<groupId>com.wm</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>Mavens-service</artifactId>
<packaging>jar</packaging>
<name>Mavens-service</name>
<dependencies>
<dependency>
<groupId>com.wm</groupId>
<artifactId>Mavens-core</artifactId>
</dependency>
</dependencies>
</project>
Mavens-web
<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">
<parent>
<artifactId>Mavens-parent</artifactId>
<groupId>com.wm</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>Mavens-web</artifactId>
<packaging>war</packaging>
<name>Mavens-web Maven Webapp</name>
<dependencies>
<dependency>
<groupId>com.wm</groupId>
<artifactId>Mavens-core</artifactId>
</dependency>
<dependency>
<groupId>com.wm</groupId>
<artifactId>Mavens-service</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
</dependency>
</dependencies>
<build>
<finalName>Mavens-web</finalName>
<plugins>
<!-- jetty插件 -->
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.3.8.v20160314</version>
<configuration>
<webAppConfig>
<contextPath>/</contextPath>
<defaultsDescriptor>src/main/resources/webdefault.xml</defaultsDescriptor>
</webAppConfig>
</configuration>
</plugin>
</plugins>
</build>
</project>
这里介绍一下父类里的dependencyManagement 是子类可以继承,但要在需要用到里面包的子类,引入这个包,但是不需要填写version或其他配置,父类都配置好了。
如:
<dependency>
<groupId>com.wm</groupId>
<artifactId>Mavens-core</artifactId>
</dependency>
父类里直接写在dependencys里的子类都会继承下来