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打包后-JAR包名为时间戳orSNAPSHOT

一、现象

通过maven-assembly-plugin插件打包，发现lib里有的Jar包格式为artifact-demo-1.0.SNAPSHOT.jar，而有的格式为artifact-demo-1.0.20211123.202203-4.jar。

有个明显的现象是执行mvn clean package命令时，所编译的module后缀皆为SNAPSHOT。

二、跟踪

1. 查看Maven日志

1）Jar名为SNAPSHOT的关键日志

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2021-11-23 16:18:07,621 [DEBUG] Adding dependency artifact com.xxx.xxx:xxx-client:jar:1.2.2-SNAPSHOT.
2021-11-23 16:18:07,623 [DEBUG] Adding artifact: com.xxx.xxx:xxx-client:jar:1.2.2-SNAPSHOT with file: /export/mavenRepository/repository/com/xxx/xxx/xxx-client/1.2.2-SNAPSHOT/xxx-client-1.2.2-SNAPSHOT.jar to assembly location: lib/xxx-client-1.2.2-SNAPSHOT.jar.
2021-11-23 16:18:07,623 [DEBUG] Adding file: /export/mavenRepository/repository/com/xxx/xxx/susf-client/1.2.2-SNAPSHOT/xxx-client-1.2.2-SNAPSHOT.jar to archive location: lib/xxx-client-1.2.2-SNAPSHOT.jar

2）Jar名为时间戳的关键日志

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2021-11-23 16:18:07,621 [DEBUG] Adding dependency artifact com.xxx.xxx:xxx-client:jar:1.2.2-SNAPSHOT.
2021-11-23 16:18:07,623 [DEBUG] Adding artifact: com.xxx.xxx:xxx-client:jar:1.2.2-SNAPSHOT with file: /export/mavenRepository/repository/com/xxx/xxx/xxx-client/1.2.2-SNAPSHOT/xxx-client-1.2.2-SNAPSHOT.jar to assembly location: lib/xxx-client-1.2.2-20211123.202203-4.jar.
2021-11-23 16:18:07,623 [DEBUG] Adding file: /export/mavenRepository/repository/com/xxx/xxx/susf-client/1.2.2-SNAPSHOT/xxx-client-1.2.2-SNAPSHOT.jar to archive location: lib/xxx-client-1.2.2-20211123.202203-4.jar

结论：以上过程发生在Assembly插件执行阶段，其把本地仓库中的jar复制到指定的lib目录下。此时会有差异，有的保留了SNAPSHOT，有的替换为时间戳。

2. 调试Assembly插件

1）获取Assembly源码

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$ git clone git@github.com:apache/maven-assembly-plugin.git
$ git checkout maven-assembly-plugin-2.2.1

2）入口方法：org.apache.maven.plugin.assembly.archive.task.AddArtifactTask#execute

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final String fileNameMapping = AssemblyFormatUtils.evaluateFileNameMapping(outputFileNameMapping, artifact, configSource.getProject(), moduleProject, moduleArtifact, project, configSource);
final String outputLocation = destDirectory + fileNameMapping;
final File artifactFile = artifact.getFile();
logger.debug("Adding artifact: " + artifact.getId() + " with file: " + artifactFile + " to assembly location: " + outputLocation + ".");
if (fileMode != -1) {
    archiver.addFile(artifactFile, outputLocation, fileMode);
} else {
    archiver.addFile(artifactFile, outputLocation);
}

3）生成文件名：org.apache.maven.plugin.assembly.utils.AssemblyFormatUtils#evaluateFileNameMapping

打断点，查看outputFileNameMapping值为：${artifact.artifactId}-${artifact.version}${dashClassifier?}.${artifact.extension}。生成的Jar包是否是时间戳，差异处在于${artifact.version}的值。

下面代码设置artifact的context值。

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interpolator.addValueSource(new PrefixedObjectValueSource( "artifact.", artifact));
interpolator.addValueSource(new PrefixedObjectValueSource( "artifact.", artifact.getArtifactHandler()));

if (artifactProject != null) {
  interpolator.addValueSource( new PrefixedObjectValueSource( "artifact.", artifactProject));
  if (artifactProject.getArtifact() != null ) {
    interpolator.addValueSource( new PrefixedObjectValueSource( "artifact.", artifactProject.getArtifact()));
  }
}

4）TODO跟踪artifactProject何时非空

# 参考

  1. https://stackoverflow.com/questions/2516860/maven-how-to-create-assembly-with-snapshot-artifacts-without-timestamps-file-na

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