An in-depth look at the lifecycle of each stage in the Maven build process

Maven life cycle analysis: Detailed explanation of each stage in the build process, specific code examples are required

Introduction:
Maven is a widely used project management tool. It not only helps developers manage project dependencies and build projects, but also automates a series of build tasks. Maven uses a strictly defined life cycle to manage various stages of the project build process. This article will analyze the Maven life cycle in detail and provide specific code examples to help readers better understand and apply Maven.

1. Overview of Maven life cycle
The Maven life cycle consists of three independent life cycle stages, and each life cycle stage contains a series of plug-in goals. The three life cycle stages are: Clean Lifecycle, Default Lifecycle and Site Lifecycle. Below we will analyze them one by one.

1. Clean Lifecycle
   Clean Lifecycle is used to clean the files generated by the project build to ensure the cleanliness and integrity of the project build. It contains the following three stages:
   (1) pre-clean: a series of operations performed before the cleaning process.
   (2)clean: Clean the generated files and directories.
   (3) post-clean: A series of operations performed after the cleaning process.

Sample code:

mvn clean

2. Default Lifecycle (Default Lifecycle)
   Default Lifecycle is the life cycle started by Maven by default, which includes a series of commonly used builds stages, such as compilation, testing, packaging, etc. Since Default Lifecycle is started by default, we only need to execute the mvn command, and Maven will automatically execute the build tasks in the order of the stages of Default Lifecycle. Default Lifecycle includes the following stages:
   (1) validate: Verify the correctness of the project.
   (2) initialize: Initialize the build environment.
   (3)generate-sources: Generate source code.
   (4) process-sources: Process source code.
   (5)generate-resources: Generate project resource files.
   (6) process-resources: Process project resource files.
   (7)compile: Compile the project source code.
   (8) process-classes: Process compiled binary files.
   (9)generate-test-sources: Generate test code.
   (10) process-test-sources: Process test code.
   (11) generate-test-resources: Generate test resource files.
   (12) process-test-resources: Process test resource files.
   (13) test-compile: Compile the test code.
   (14) process-test-classes: Process binary files of test classes.
   (15)test: Run the test.
   (16) prepare-package: Prepare for packaging.
   (17) package: package.
   (18) pre-integration-test: A series of operations performed before integration testing.
   (19)integration-test: Execute integration test.
   (20) post-integration-test: A series of operations performed after integration testing.
   (21) verify: Verify the correctness of the packaging.
   (22)install: Install the packaged project to the local warehouse.
   (23) deploy: Deploy the packaged project to the remote warehouse.

Sample code:

mvn compile

3. Site Lifecycle (site life cycle)
   Site Lifecycle is used to generate the site documentation of the project. It contains the following stages:
   (1) pre-site: a series of operations performed before generating the site.
   (2)site: Generate the site document of the project.
   (3) post-site: A series of operations performed after generating the site.
   (4)site-deploy: Deploy the generated site document to the remote server.

Sample code:

mvn site

2. Custom configuration of Maven life cycle
By default, Maven will execute build tasks according to the specified life cycle. However, we can also customize the configuration lifecycle stages and plugin goals according to the needs of the project. The specific steps are as follows:

1. Create a new life cycle
   We can implement custom configuration by creating a new life cycle. In the project's pom.xml file, add the following code snippet:

   <project>
     ...
     <build>
    <lifecycle>
      <id>custom-lifecycle</id>
      <phases>
        <phase>...</phase>
        ...
      </phases>
    </lifecycle>
     </build>
     ...
   </project>

   Among them, is used to specify the name of the new life cycle, and contains the life cycle stages that need to be added.

2. Add plug-in goals
   In the new life cycle, we can customize the plug-in goals that need to be executed. Under the tag in the pom.xml file, add the following code snippet:

   <plugins>
     <plugin>
    <groupId>...</groupId>
    <artifactId>...</artifactId>
    <version>...</version>
    <executions>
      <execution>
        <id>...</id>
        <phase>...</phase>
        <goals>
          <goal>...</goal>
        </goals>
      </execution>
    </executions>
     </plugin>
     ...
   </plugins>

   Among them, , and are used to specify plug-in information, < ;execution> is used to define the execution configuration of the plug-in.

   3. Summary
   This article analyzes the three stages of the Maven life cycle in detail, including Clean Lifecycle, Default Lifecycle and Site Lifecycle, and provides corresponding code examples to help readers understand and apply Maven. At the same time, we also introduced how to customize the Maven life cycle to meet the specific needs of the project. By learning and applying the Maven life cycle, we can better manage and build projects and improve development efficiency. Finally, I hope this article is helpful to readers, thank you for reading!

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