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README explaining two particular things about the pom.xml here:
0) The two profiles are auto-activated by using the m2e.version property.
This property is always automatically set by m2e when running under m2e.
It avoid the need to set something via for Project Properties > Maven > Active Maven Profiles.
The normal (CLI) build is not affected by these profiles.
1) It uses M2E Lifecycle Mapping, to (try to) tell m2e NOT to run any plugins inside Eclipse,
as one typically really only wants the Maven Dependencies Classpath Container:
@see https://docs.sonatype.org/pages/viewpage.action?pageId=2949459
Simulating "java-only" lifecycle mapping with m2e 0.9.9.200909092308 Also
https://docs.sonatype.org/display/M2ECLIPSE/Customizable+build+lifecycle+mapping+for+m2e+extensions+developers
Also https://issues.sonatype.org/browse/MNGECLIPSE-2209 Also https://docs.sonatype.org/display/M2ECLIPSE/Maven+build+lifecycle
Also http://svn.apache.org/repos/asf/maven/maven-3/trunk/pom.xml as an example
Also https://issues.sonatype.org/browse/MNGECLIPSE-2252 -->
This, combined with using Eclipse Class Folders (see Project Properties > Java
Build Path > Libraries), leads to better build performance, and less problems.
One theoretical drawback is that e.g. Resource Filter is then not available within Eclipse, but a) that
(constrasted with the build speed gain) is rarely really an issue, and b) doesn't seem to really
work as intended (by m2e) anyway (m2e version at the time of writing).
2) It has some magic which keeps the build output folder separate for Eclipse and the Maven.
This is required because the CLI Maven build puts files into the target which when running
inside Eclipse we already have on the classpath via Class Folders (see Project Properties >
Java Build Path > Libraries).
@see https://docs.sonatype.org/display/M2ECLIPSE/Project+FAQ#ProjectFAQ-HowtoconfigureMavenprojecttouseseparateoutputfoldersinEclipse
@see http://m2eclipse.sonatype.org/m2eclipse-faq.html#8
Re. "many Maven plugins have assumptions about location of compiled classes and resources
and in many cases, changing output folders would simply break those Maven plugins", this should
not be an issue, because of the lifecycle-mapping explaining above.
By default, build dir is CLI Maven's 'target' directory. A m2e-activated maven profiled
override that with 'targetEclipse'. That directory HAS TO MATCH what is in an Eclipse project's .classpath.
@author Michael Vorburger
@since 2010/11/07
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