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作为从 Java 1.7 到 1.8 的构建迁移的一部分，我试图干净利落地维护 maven 工件的分离（Web 服务器上的当前 JRE 仍在运行 1.7 - 拥有 Java 8 将是一件坏事编译的程序在错误的服务器上）。我正在尝试使用作为配置文件的一部分添加的分类器来清楚地区分构建的工件。

有一个罐子 pom.xml：

<?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">
    <parent>
        <artifactId>parentpom</artifactId>
        <groupId>com.shagie.mvn</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>

    <artifactId>the-jar</artifactId>
</project>

有一个war pom.xml：

<?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">
    <parent>
        <artifactId>parentpom</artifactId>
        <groupId>com.shagie.mvn</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>the-war</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.shagie.mvn</groupId>
            <artifactId>the-jar</artifactId>
        </dependency>
    </dependencies>
</project>

还有父pom.xml：

<?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>com.shagie.mvn</groupId>
    <artifactId>parentpom</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>the-jar</module>
        <module>the-war</module>
    </modules>

    <packaging>pom</packaging>

    <properties>
        <java.version>1.7</java.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.shagie.mvn</groupId>
                <artifactId>the-jar</artifactId>
                <version>1.0-SNAPSHOT</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.1</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <profiles>
        <profile>
            <id>jdk8</id>
            <properties>
                <java.version>1.8</java.version>
            </properties>
            <build>
                <pluginManagement>
                    <plugins>
                        <plugin>
                            <artifactId>maven-jar-plugin</artifactId>
                            <executions>
                                <execution>
                                    <phase>package</phase>
                                    <goals>
                                        <goal>jar</goal>
                                    </goals>
                                    <configuration>
                                        <classifier>jdk8</classifier>
                                    </configuration>
                                </execution>
                            </executions>
                        </plugin>
                        <plugin>
                            <artifactId>maven-war-plugin</artifactId>
                            <executions>
                                <execution>
                                    <phase>package</phase>
                                    <goals>
                                        <goal>war</goal>
                                    </goals>
                                    <configuration>
                                        <classifier>jdk8</classifier>
                                    </configuration>
                                </execution>
                            </executions>
                        </plugin>
                    </plugins>
                </pluginManagement>
            </build>
            <dependencyManagement>
                <dependencies>
                    <dependency>
                        <groupId>com.shagie.mvn</groupId>
                        <artifactId>the-jar</artifactId>
                        <version>1.0-SNAPSHOT</version>
                        <classifier>jdk8</classifier>
                    </dependency>
                </dependencies>
            </dependencyManagement>
        </profile>
    </profiles>
</project>

各个工件确实使用指定的 Java 版本正确构建。

不幸的是，战争并没有使用指定 jar 作为依赖项的 jdk8 分类器来构建。

mvn help:effective-pom -P jdk8在war项目中运行时可以看到：

  ...
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.shagie.mvn</groupId>
        <artifactId>the-jar</artifactId>
        <version>1.0-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>com.shagie.mvn</groupId>
        <artifactId>the-jar</artifactId>
        <version>1.0-SNAPSHOT</version>
        <classifier>jdk8</classifier>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>com.shagie.mvn</groupId>
      <artifactId>the-jar</artifactId>
      <version>1.0-SNAPSHOT</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>
  ...

这反映在运行依赖图时：

$ mvn dependency:tree -P jdk8
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building the-war 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ the-war ---
[INFO] com.shagie.mvn:the-war:jar:1.0-SNAPSHOT
[INFO] \- com.shagie.mvn:the-jar:jar:1.0-SNAPSHOT:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

有没有办法让配置文件激活来更改特定的 jar 依赖项以使用分类器？

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