Java spring boot starter jetty和jetty模块-Maven magic

我们在maven pom中使用spring boot starter jetty，这意味着我们对jetty没有任何直接依赖，因此无法控制其版本

这一切都很好，但我们现在需要在jetty的一个模块上添加一个依赖项，这些模块使用相同的jetty版本约定

这一切都很棒，但因为我们不能使用spring boot starter jetty作为我们的根pom，所以我们在模块的依赖项声明下再次声明jetty的版本，如下所示：

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-jetty</artifactId>
   <version>1.4.3-RELEASE</version>
</dependency>
<dependency>
   <groupId>org.eclipse.jetty</groupId>
   <artifactId>jetty-nosql</artifactId>
   <version>9.3.14.v20161028</version>
</dependency>

这既不好玩也不危险，因为如果我们升级其中一个，我们必须记住将后者升级到相同的版本

我知道我们可以在模块的依赖项下添加一个exclude，但这感觉像是一个hack plus，仍然不能完全保护我们免受破坏性更改的影响

是否有必要从spring boot中提取jetty版本，并将其重新用于模块的依赖关系

---

谢谢

Maven在有效POM中为其依赖项创建版本属性。对于jetty，它是jetty.version

因此，您的依赖关系将成为

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-nosql</artifactId>
        <version>${jetty.version}</version>
    </dependency>

完全聚甲醛

或者，如果您正在使用或最新版本的Eclipse，那么您可以在Maven POM编辑器的底部选项卡中直接检查它

编辑

如果没有spring boot父pom，也可以使用DependencyManager完成同样的操作

以下是没有spring引导父级的完整pom

<?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>

    <groupId>TestDependency</groupId>
    <artifactId>TestDependency</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>

    <name>TestDependency</name>
    <description>TestDependency</description>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>1.4.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-nosql</artifactId>
            <version>${jetty.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

---

谢谢你的回答，但是我们不能用spring boot starter作为我们的父母为什么不呢？您使用的是另一个父项还是从属项管理？添加了没有父项的配置。

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-nosql</artifactId>
    </dependency>

<?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>

    <groupId>TestDependency</groupId>
    <artifactId>TestDependency</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>

    <name>TestDependency</name>
    <description>TestDependency</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-nosql</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

mvn help:effective-pom

<?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>

    <groupId>TestDependency</groupId>
    <artifactId>TestDependency</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>

    <name>TestDependency</name>
    <description>TestDependency</description>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>1.4.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-nosql</artifactId>
            <version>${jetty.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>