Maven 执行器附加在子级中

Question

我正在使用 Maven 执行器插件。鉴于我有 parent 和 child pom.xml , 我想要 exclusions 中的元素和 inclusions标签被附加而不是被覆盖。我试过使用 combine.children="append"为此，它可以工作，但我最终得到了一个额外的 configuration标签。我在使用 combine.children不正确和/或如何避免额外的 configuration标签？请参见下面的示例:

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 child 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

如果您真的想获得预期的合并配置，那么您应该在子模块中具有以下内容:

<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值以便使用附加配置指向(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 combine.* 用法的重要说明属性，来自 official documentation

Note that these attributes only apply to the configuration element they are declared on, and are not propagated to nested elements. That is if the content of an item element from the child POM was a complex structure instead of text, its sub-elements would still be subject to the default merge strategy unless they were themselves marked with attributes.