Deploy an artifact in legacy layout
"Legacy" is the layout used in maven 1 repositories while maven 2 uses "default". They are different in terms of directory structure, timestamp of snapshots in default and existence of metadata files in default.
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legacy layout directory structure:
groupId |--artifactId |--jars `--artifact -
default layout directory structure:
groupId |--artifactId |--version | `---artifact |---metadata
Legacy layout support was removed in version 3.0.0 of this plugin. There is no repositoryLayout parameter in the 3.x/4.x lines: Maven 3 and later only support the default (Maven 2) repository layout, and a -DrepositoryLayout=legacy flag on the command line is silently ignored by Maven (it does not select a legacy layout).
To deploy into a Maven 1 (legacy) layout repository, use maven-deploy-plugin 2.x with Maven 2, or convert the repository to the default layout with a repository manager.

