faster builds on development machine

[adrian-herscu]

Current State

On Windows with JRE 8, 11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60GHz, 1498 Mhz, 4 Core(s), 8 Logical Processor(s), 4 GB out of 16 available RAM, maven running with --threads 1.5C

• mvn and mvnw clean install gets stuck on maven-archetype-plugin:update-local-catalog
• with mode-build-nosign it takes 06'18"
• with mode-build-fast it takes 01'14"
• mvnw site site:stage takes 06'05"
• with mode-site-fast it takes 01'19"

How to make it better

Upgrade to maven 3.9.x in order get build caching; see https://maven.apache.org/extensions/maven-build-cache-extension/

Issues

Apparently, the impsort-maven-plugin:1.5.0 depends on some older component of Maven which might need to be added as a dependency; see https://maven.apache.org/guides/mini/guide-configuring-plugins.html#Using_the_.3Cdependencies.3E_Tag

Upgrading above plugin requires running with JRE 11+, effectively breaking JDK 8 support.

See also https://github.com/revelc/impsort-maven-plugin/issues/69

[adrian-herscu]

Apparently site artifacts are not cached -- opened: https://issues.apache.org/jira/projects/MBUILDCACHE/issues/MBUILDCACHE-65

mode-build-nosign now takes less than 20 seconds.

GPG signatures, or any other artifacts beyond binary/source/javadoc JARs, are not cached.