mvn_install macro installs Maven artifacts into %buildroot.
Specification of artifacts to be installed is taken from .xmvn-reactor file. This file can be populated using mvn_build and/or mvn_artifact macros.
Specification how artifacts should be installed is taken from installer settings section in XMvn configuration. See XMvn Configuration Reference for more information. Macros mvn_alias(7), mvn_build(7), mvn_compat_version(7), mvn_config(7), mvn_file(7) and mvn_package(7) are capable of writing configuration that can affect behavior of mvn_install.
Bugs should be reported through Java Packages Tools issue tracker at Github: m[blue]https://github.com/fedora-java/javapackages/issuesm.