什么引用< id> Maven插件执行的价值？ [英] What references the <id> value of a Maven plugin execution?

问题描述

在Maven < plugin> 元素中，有一个< executions> 元素，其中包含多个< execution> 元素。每个< execution> 元素都可以包含一个包含字符串的< id> 元素。什么引用那些< id> ...< / id> 元素？省略该元素意味着什么？ < id> 元素的语义是什么？

In a Maven <plugin> element there is an <executions> element which contains multiple <execution> elements. Each <execution> element can have an <id> element containing a string. What references those <id>...</id> elements? What does it mean to omit that element? What are the semantics of the <id> element?

例如：

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <executions>
          <execution>
            <id>default-jar-execution</id>
            <configuration>
              <finalName>mainjar</finalName>
            </configuration>
          </execution>
          <execution>
            <id>extra-jar-execution</id>
            <goals>
              <goal>jar</goal>
            </goals>
            <configuration>
              <finalName>anotherjar</finalName>
            </configuration>
          </execution>
        </exectutions>
      </plugin>
      [...]
    </plugins>
  </build>
</project>

什么引用那些< id> default-jar-execution< / id> ; 和< id> extra-jar-execution< / id> 值？改变这些字符串的行为差异是什么？删除这些元素意味着什么？

What references those <id>default-jar-execution</id> and <id>extra-jar-execution</id> values? What is the behavioral difference of changing either of those strings? What does it mean to remove those elements?

推荐答案

id 元素有两个功能：

1. 文档


2. 允许Maven知道你何时想要创建一个新执行以及何时修改现有。

1. Documentation
2. Allow Maven to know when you want to create a new execution and when you want to modify an existing one.

第一种情况很简单：它只允许你给执行一个有意义的名字。

The first case is simple: It just allows you to give the execution a meaningful name.

第二种情况意味着Maven带有默认执行，你可以在运行<$ c时看到例如，$ c> mvn help：effective-pom 。如果要替换/扩展现有执行，则需要使用相同的 id 。 Maven然后将两者合并。

The second case means that Maven comes with default executions which you can see when you run mvn help:effective-pom, for example. If you want to replace/extend an existing execution, you need to use the same id. Maven will then merge the two.

参见 http://maven.apache.org/guides/mini/guide-configuring-plugins.html#Using_the_executions_Tag

合并来自不同POM的相同ID的执行。

Executions of the same id from different POMs are merged.

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