Maven 执行器附加在儿童中

Question

我正在使用 maven 执行器插件。鉴于我有一个 parent 和 child pom.xml，我希望exclusions和inclusions标签中的元素被附加而不是被覆盖。我试过combine.children="append"为此使用它并且它有效，但我最终得到了一个额外的configuration标签。我是否使用combine.children不正确和/或如何避免额外的configuration标签？请参阅下面的示例：

在父pom.xml：

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>1.4.1</version>
        <executions>
          <execution>
            <id>enforce-banned-dependencies</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <bannedDependencies>
                  <excludes>
                    <exclude>org.apache.maven</exclude>
                    <exclude>org.apache.maven:badArtifact</exclude>
                    <exclude>*:badArtifact</exclude>
                  </excludes>
                  <includes>
                    <!--only 1.0 of badArtifact is allowed-->
                    <include>org.apache.maven:badArtifact:1.0</include>
                  </includes>
                </bannedDependencies>
              </rules>
              <fail>true</fail>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  [...]
</project>

在孩子pom.xml：

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <configuration>
          <rules>
            <bannedDependencies>
              <includes combine.children="append">
                <include>org.apache.maven:otherArtifact:2.0</include>
              </includes>
            </bannedDependencies>
          </rules>
        </configuration>
      </plugin>
    </plugins>
  </build>
  [...]
</project>

预期有效 POM：

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>1.4.1</version>
        <executions>
          <execution>
            <id>enforce-banned-dependencies</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <bannedDependencies>
                  <excludes>
                    <exclude>org.apache.maven</exclude>
                    <exclude>org.apache.maven:badArtifact</exclude>
                    <exclude>*:badArtifact</exclude>
                  </excludes>
                  <includes>
                    <!--only 1.0 of badArtifact is allowed-->
                    <include>org.apache.maven:badArtifact:1.0</include>
                    <include>org.apache.maven:otherArtifact:2.0</include>
                  </includes>
                </bannedDependencies>
              </rules>
              <fail>true</fail>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  [...]
</project>

实际有效POM：

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>1.4.1</version>
        <executions>
          <execution>
            <id>enforce-banned-dependencies</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <bannedDependencies>
                  <excludes>
                    <exclude>org.apache.maven</exclude>
                    <exclude>org.apache.maven:badArtifact</exclude>
                    <exclude>*:badArtifact</exclude>
                  </excludes>
                  <includes combine.children="append>
                    <!--only 1.0 of badArtifact is allowed-->
                    <include>org.apache.maven:badArtifact:1.0</include>
                    <include>org.apache.maven:otherArtifact:2.0</include>
                  </includes>
                </bannedDependencies>
              </rules>
              <fail>true</fail>
            </configuration>
          </execution>
        </executions>
        <configuration>
          <rules>
            <bannedDependencies>
              <includes combine.children="append">
                <include>org.apache.maven:otherArtifact:2.0</include>
              </includes>
            </bannedDependencies>
          </rules>
        </configuration>
      </plugin>
    </plugins>
  </build>
  [...]
</project>

Answer 1

如果您确实想获得预期的合并配置，那么您应该在子模块中包含以下内容：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-enforcer-plugin</artifactId>
    <executions>
        <execution>
            <id>enforce-banned-dependencies</id>
            <configuration>
                <rules>
                    <bannedDependencies>
                        <includes>
                            <include>org.apache.maven:badArtifact:2.0</include>
                        </includes>
                    </bannedDependencies>
                </rules>
                <fail>true</fail>
            </configuration>
        </execution>
    </executions>
</plugin>

也就是说，重用相同的执行id值以便通过附加配置指向（覆盖/合并）相同的执行。

那么合并后的有效pom如下：

<plugin>
    <artifactId>maven-enforcer-plugin</artifactId>
    <version>1.4.1</version>
    <executions>
        <execution>
            <id>enforce-banned-dependencies</id>
            <goals>
                <goal>enforce</goal>
            </goals>
            <configuration>
                <rules>
                    <bannedDependencies>
                        <includes combine.children="append">
                            <include>org.apache.maven:badArtifact:1.0</include>
                            <include>org.apache.maven:badArtifact:2.0</include>
                        </includes>
                        <excludes>
                            <exclude>org.apache.maven</exclude>
                            <exclude>org.apache.maven:badArtifact</exclude>
                            <exclude>*:badArtifact</exclude>
                        </excludes>
                    </bannedDependencies>
                </rules>
                <fail>true</fail>
            </configuration>
        </execution>
    </executions>
</plugin>

因此，无需使用它：默认的合并行为将满足您的需求。

关于属性使用的一个重要说明combine.*，来自官方文档

请注意，这些属性仅适用于声明它们的配置元素，并且不会传播到嵌套元素。也就是说，如果子 POM 中的 item 元素的内容是复杂结构而不是文本，则其子元素仍将遵循默认合并策略，除非它们本身标记有属性。