Question

假设插件作者未能在其文档中提及maven插件的默认阶段，我想弄明白。

运行mvn -X verify以

的形式提供输出

[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]

告诉我，maven可以打印相同的字符串五次到stdout，然后是

形式的列表

[DEBUG] -----------------------------------------------------------------------
[DEBUG] Goal:          org.apache.maven.plugins:maven-checkstyle-plugin:2.6:check (checkstyle)
[DEBUG] Style:         Regular
[DEBUG] Configuration: [...]

为每个插件后跟“Dependency collection stats”，然后是插件的调试输出。

我是否必须假设 - 即使在具有最大详细程度（afaik）的10000行调试输出中，工作phase也不会发生，并且搜索引擎仅显示1000个重复解释，相位是什么maven生命周期 - 这是一个保密的秘密。

我在Ubuntu 15.04上使用maven 3.3.1和Linux 4.0.1。

Answer 1

好问题： - ）

我相信插件作者probablby忘记了文档？所以关于插件信息中的目标和阶段的信息（希望如此）。

对于maven-compiler-plugin，如果你下载jar并解压缩它，那么maven-compiler-plugin-3.3\META-INF\maven\plugin.xml中有一个plugin.xml

该插件包含mojo（目标）及其配置阶段：

  <mojos>
    <mojo>
      <goal>compile</goal>
      <description>Compiles application sources</description>
      <requiresDependencyResolution>compile</requiresDependencyResolution>
      <requiresDirectInvocation>false</requiresDirectInvocation>
      <requiresProject>true</requiresProject>
      <requiresReports>false</requiresReports>
      <aggregator>false</aggregator>
      <requiresOnline>false</requiresOnline>
      <inheritedByDefault>true</inheritedByDefault>
      <phase>compile</phase>
      <implementation>org.apache.maven.plugin.compiler.CompilerMojo</implementation>
      <language>java</language>

这里编译目标在<phase>编译中运行。我希望你好奇的插件也包含这个。

Answer 2

appropriate plugin page.

记录了要绑定目标的默认阶段

例如，上述文档针对目标compile显示以下内容：

Requires a Maven project to be executed.
Requires dependency resolution of artifacts in scope: compile.
The goal is thread-safe and supports parallel builds.
Since version: 2.0.
Binds by default to the lifecycle phase: compile.

这意味着（最后一行）默认情况下，maven-compile-plugin绑定到生命周期阶段：compile如果没有被覆盖。此外，reference documentation显示哪些插件绑定到哪个阶段。

除了上述内容，如果插件作者决定不将插件绑定到默认生命周期，它将不会成为文档的一部分。如果插件作者决定将插件绑定到生命周期阶段，则会自动记录cause it's generated from source code.

代码如下所示：

@org.apache.maven.plugins.annotations.Mojo( 
  name = "compile", 
  defaultPhase = LifecyclePhase.COMPILE, 
  threadSafe = true,
  requiresDependencyResolution = ResolutionScope.COMPILE )
public class CompilerMojo
  extends AbstractCompilerMojo
  {

从上面的代码中生成文档。

如何确定maven插件执行的阶段？

2 个答案: