默认的 maven 插件版本是如何决定的?

问题描述

我想知道我什么时候没有在某些模块的 pom.xml 中指定插件版本，例如:

I wonder when I did not specify a plugin version in some module's pom.xml like in:

<build>
...
<plugin>
   <groudId>org.apache.maven.plugins</groupId>
   <artifactId>maven-compiler-plugin</artifactId>
   <version>3.8.0</version>
</plugin>
...
</build>

运行mvn compile"时使用的默认插件版本是什么?

What is the default plugin version used when I run "mvn compile"?

我已经试过了，实际上它使用的是 maven-compiler-plugin 版本3.1"，上面的插件元素被注释，我的 maven 版本是 3.6.3.

I have tried it and see actually it is using maven-compiler-plugin version "3.1" with above plugin element commented, my maven version is 3.6.3.

我花了 1 小时通过 Maven 的文档和相关帖子在谷歌上搜索，但没有找到确切的答案.我真的很想知道那个版本是如何决定的?如果有人知道任何线索，不胜感激.

I have spent 1 hour to google thru Maven's documentation and related posts, but not find exact answer. I really like to know how that version is being decided? If anyone know any clue, it is greatly appreciated.

推荐答案

神奇的不是发生在超级 pom 中，而是发生在所谓的 bindings descriptor 中，可在 https://github.com/apache/maven/blob/master/maven-core/src/main/resources/META-INF/plexus/default-bindings.xml.但是，他们正在转向匹配的打包插件，例如 maven-jar-plugin 它位于 https://github.com/apache/maven-jar-plugin/blob/master/src/main/filtered-资源/META-INF/plexus/components.xml这些版本尚未更新，因为如果 2 个具有不同 Maven 版本的用户具有不同的结果(例如，一个构建损坏，另一个没有)，那将会很奇怪.因此最好在 pom 中指定插件版本，不要依赖 Maven 提供的默认值.

The magic is not happening in the super pom, but in the so called bindings descriptor as available at https://github.com/apache/maven/blob/master/maven-core/src/main/resources/META-INF/plexus/default-bindings.xml.However, they are moving to the matching packaging plugin, for example for the maven-jar-plugin it is located at https://github.com/apache/maven-jar-plugin/blob/master/src/main/filtered-resources/META-INF/plexus/components.xmlThese versions haven't been updated, because it would be weird if 2 users with different Maven versions have different results (e.g. one has a broken build, the other not). Hence it is better to specify the plugin versions in the pom, don't rely of the defaults provided by Maven.

最后在https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html

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