[英]Maven `pre` and `post` phases
Are the pre
and post
phases always executed when I execute the associated phase?当我执行相关阶段时,是否总是执行pre
阶段和post
阶段? For example, if I do mvn clean
, will this execute the mvn post-clean
phase, too?例如,如果我执行mvn clean
,这是否也会执行mvn post-clean
阶段?
I was looking at https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html#Lifecycle_Reference , in which it said:我在看https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html#Lifecycle_Reference ,其中说:
The following lists all build phases of the default, clean and site lifecycles, which are executed in the order given up to the point of the one specified.下面列出了默认、清理和站点生命周期的所有构建阶段,它们按照指定的时间点之前的顺序执行。
So strictly speaking, since post-clean
comes after clean
, it should not be executed if I just do mvn clean
.所以严格来说,由于post-clean
是在clean
之后进行的,所以如果我只执行mvn clean
就不应该执行它。 But my gut feel is different - although, I didn't find a way to verify this, as the maven stdout doesn't print the phase it's executing.但是我的直觉是不同的 - 虽然,我没有找到一种方法来验证这一点,因为 Maven 标准输出不打印它正在执行的阶段。
Could anyone weigh in on the answer and how you verified?任何人都可以权衡答案以及您如何验证?
You can bind a plugin (such as echo-maven-plugin
) to the phases of the clean
lifecycle to help verify if/when each phase is executed.您可以将插件(例如echo-maven-plugin
)绑定到clean
生命周期的阶段,以帮助验证是否/何时执行每个阶段。
For example, given the following plugin definition:例如,给定以下插件定义:
<plugin>
<groupId>com.github.ekryd.echo-maven-plugin</groupId>
<artifactId>echo-maven-plugin</artifactId>
<version>1.2.0</version>
<executions>
<execution>
<id>pre-clean</id>
<phase>pre-clean</phase>
<goals>
<goal>echo</goal>
</goals>
<configuration>
<message>In 'pre-clean'</message>
</configuration>
</execution>
<execution>
<id>clean</id>
<phase>clean</phase>
<goals>
<goal>echo</goal>
</goals>
<configuration>
<message>In 'clean'</message>
</configuration>
</execution>
<execution>
<id>post-clean</id>
<phase>post-clean</phase>
<goals>
<goal>echo</goal>
</goals>
<configuration>
<message>In 'post-clean'</message>
</configuration>
</execution>
</executions>
</plugin>
Invoking mvn clean
will result in the following output:调用mvn clean
将产生以下输出:
$ mvn clean
[INFO] Scanning for projects...
[INFO]
[INFO] --- echo-maven-plugin:1.2.0:echo (pre-clean) @ sandbox ---
[INFO] In 'pre-clean'
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ sandbox ---
[INFO] Deleting target
[INFO]
[INFO] --- echo-maven-plugin:1.2.0:echo (clean) @ sandbox ---
[INFO] In 'clean'
So, there's no invocation of the post-clean
phase there.所以,那里没有调用post-clean
阶段。
Invoking mvn clean compile
will result in the following output:调用mvn clean compile
将产生以下输出:
$ mvn clean compile
[INFO] Scanning for projects...
[INFO]
[INFO] --- echo-maven-plugin:1.2.0:echo (pre-clean) @ sandbox ---
[INFO] In 'pre-clean'
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ sandbox ---
[INFO]
[INFO] --- echo-maven-plugin:1.2.0:echo (clean) @ sandbox ---
[INFO] In 'clean'
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ sandbox ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.5.1:compile (default-compile) @ sandbox ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 5 source files to ...
Again, there's no invocation of the post-clean
phase there.同样,那里没有调用post-clean
阶段。 This implies that the maven-clean-plugin (and perhaps nothing else) is not bound to post-clean
.这意味着 maven-clean-plugin(也许没有别的)不受post-clean
约束。
Invoking mvn post-clean
will result in the post-clean
phase being invoked ...调用mvn post-clean
将导致调用post-clean
阶段......
$ mvn post-clean
[INFO] Scanning for projects...
[INFO]
[INFO] --- echo-maven-plugin:1.2.0:echo (pre-clean) @ sandbox ---
[INFO] In 'pre-clean'
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ sandbox ---
[INFO] Deleting target
[INFO]
[INFO] --- echo-maven-plugin:1.2.0:echo (clean) @ sandbox ---
[INFO] In 'clean'
[INFO]
[INFO] --- echo-maven-plugin:1.2.0:echo (post-clean) @ sandbox ---
[INFO] In 'post-clean'
So, based on the above test I think the following statements are true:因此,基于上述测试,我认为以下陈述是正确的:
post-clean
is not invoked when you call clean
调用clean
时不会调用post-clean
clean
post-clean
is only called when you explicitly invoke post-clean
(note: invoking the pre-
and post-
phases directly is unusual) post-clean
仅在您显式调用post-clean
时调用(注意:直接调用pre-
和post-
阶段是不寻常的)
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