Igor Fedorenko created MNG-5771:
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Summary: user-configurable core extensions mechanism
Key: MNG-5771
URL: https://jira.codehaus.org/browse/MNG-5771
Project: Maven
Issue Type: Improvement
Components: Class Loading
Reporter: Igor Fedorenko
As of version 3.2.5 maven provides two mechanisms to contribute additional
components to maven core runtime. It is possible to add component jars to
$M2_HOME/lib/ext directory. It is also possible to specify component jars using
-Dmaven.ext.class.path command line parameter. Neither of the mechanisms is
user friendly. In both cases the user is expected to manually locate and
download all required jar file. In both cases this has to be done on all
systems where the extensions are needed. In both cases all extra jars are
loaded into single classloader so all extensions must agree of the same set of
dependencies.
This jira is to track changes needed to make it possible to configure core
extensions in terms of groupId/artifactId/version and share set of required
extensions across multiple systems.
More specifically,
* introduce new ${maven.projectBasedir}/.mvn/extensions.xml descriptor to
specify list of extensions. Initially, the descriptor will only allow
specification of extension groupId/artifactId/version, but can be extended to
support dependency includes/excludes mechanism and configuration parameters
later
{code}
<?xml version="1.0" encoding="UTF-8"?>
<extensions>
<extension>
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>...</version>
</extension>
<extension>...</extension>
...
</extensions>
{code}
* change maven to read and load core extensions in separate class realms as
part of plexus container setup.
* provide mechanism for extensions to declare exported artifacts and packages
using META-INF/maven/extension.xml descriptor.
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