an example of pom.xml

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Overview

简单的说，每个通过Maven管理的Java工程都有一个pom.xml, 这个pom.xml里定义了你这个project 需要依赖的library name及version. Maven可以自动帮你到你配置文件里指定的url去下载这些library，无需你手动完成。

Detail

I have already told you that Maven is very important in our Java project.

Here below is a real pom.xml for Maven used in our project.

Action for you

Please go through the content and try to understand the meaning of each xml tag.

<?xml version="1.0" encoding="UTF-8"?>
<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>

    <parent>
        <groupId>com.sap.cloud.yaas.service-sdk</groupId>
        <artifactId>service-sdk-superpom</artifactId>
        <version>4.3.4</version>
        <relativePath />
    </parent>

    <groupId>com.sap.coil</groupId>
    <artifactId>OpeningEventDemo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <!-- YaaS Service SDK Version -->
        <service-sdk.version>4.3.4</service-sdk.version>

        <!-- Library Versions -->
        <jaxrs.version>2.0.1</jaxrs.version>
        <jersey.version>2.19</jersey.version>
        <javax.servlet.version>3.1.0</javax.servlet.version>
        <spring.version>4.2.0.RELEASE</spring.version>
        <cors.filter.version>2.4</cors.filter.version>

        <!-- Test Library Versions -->
        <junit.version>4.12</junit.version>

        <!-- Plugin Versions -->
        <jetty.plugin.version>9.2.6.v20141205</jetty.plugin.version>

        <!-- Json Library Versions -->
        <json-lib.version>2.1</json-lib.version>
    </properties>

    <dependencies>
        <!-- YaaS Service SDK Dependencies -->
        <dependency>
            <groupId>com.sap.cloud.yaas.service-sdk</groupId>
            <artifactId>service-sdk-libraries</artifactId>
            <version>${service-sdk.version}</version>
        </dependency>

        <!-- Jersey Dependencies -->
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>${jaxrs.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-jackson</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-spring3</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.ext</groupId>
            <artifactId>jersey-bean-validation</artifactId>
            <version>${jersey.version}</version>
        </dependency>

        <!-- Spring Dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</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-expression</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-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- Servlet Dependencies -->
        <dependency>
            <groupId>com.thetransactioncompany</groupId>
            <artifactId>cors-filter</artifactId>
            <version>${cors.filter.version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${javax.servlet.version}</version>
            <scope>provided</scope>
        </dependency>

        <!-- Testing Dependencies-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-grizzly2</artifactId>
            <version>${jersey.version}</version>
            <scope>test</scope>
        </dependency>

        <!-- Logging -->
        <dependency>
            <groupId>com.sap.cloud.yaas.service-sdk</groupId> 
            <artifactId>service-sdk-logging</artifactId>
            <version>${service-sdk.version}</version>
        </dependency>

        <!-- Logging Filters-->
        <dependency>
            <groupId>com.sap.cloud.yaas.service-sdk</groupId> 
            <artifactId>service-sdk-logging-filters</artifactId>
            <version>${service-sdk.version}</version>
        </dependency>

        <!--        Authorization -->
        <dependency>
            <groupId>com.sap.cloud.yaas.service-sdk</groupId> 
            <artifactId>service-sdk-authorization</artifactId>
            <version>${service-sdk.version}</version>
        </dependency>

        <!-- Hystrix -->
        <dependency>
            <groupId>com.netflix.hystrix</groupId> 
            <artifactId>hystrix-core</artifactId>
            <version>1.4.14</version>
        </dependency>

        <!-- JSON-Lib Dependencies-->
        <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>${json-lib.version}</version>
            <classifier>jdk15</classifier>
        </dependency>

        <!--Redis Support -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.7.3</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>OpeningEventDemo</finalName>
        <plugins>
            <!-- Plugin required to build API models and resources. This dependency 
                should not be removed. -->
            <plugin>
                <groupId>com.sap.cloud.yaas.service-sdk</groupId>
                <artifactId>service-sdk-generator-maven-plugin</artifactId>
                <version>${service-sdk.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate-service</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.eclipse.jetty</groupId>
                <artifactId>jetty-maven-plugin</artifactId>
                <version>${jetty.plugin.version}</version>
                <configuration>
                    <scanIntervalSeconds>10</scanIntervalSeconds>
                    <webApp>
                        <contextPath>/</contextPath>
                    </webApp>
                </configuration>
            </plugin>
        </plugins>
        <pluginManagement>
            <plugins>
                <!--This plugin's configuration is used to store Eclipse m2e settings 
                    only. It has no influence on the Maven build itself. -->
                <plugin>
                    <groupId>org.eclipse.m2e</groupId>
                    <artifactId>lifecycle-mapping</artifactId>
                    <version>1.0.0</version>
                    <configuration>
                        <lifecycleMappingMetadata>
                            <pluginExecutions>
                                <pluginExecution>
                                    <pluginExecutionFilter>
                                        <groupId>com.sap.cloud.yaas.service-sdk</groupId>
                                        <artifactId>service-sdk-generator-maven-plugin</artifactId>
                                        <versionRange>[${service-sdk.version},)</versionRange>
                                        <goals>
                                            <goal>generate-service</goal>
                                        </goals>
                                    </pluginExecutionFilter>
                                    <action>
                                        <ignore />
                                    </action>
                                </pluginExecution>
                            </pluginExecutions>
                        </lifecycleMappingMetadata>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>

</project>

The version in pom.xml:

is mapped to library version here:

Another example:

2.19: