Hi,

The main difference is in maven site plugin. Maven3 poms should not
contain <reporting> element. Instead they should be placed in the
<reportPlugins> element in the site plugin configuration. [1]

recommended versions for the plugins,

maven-site-plugin  : 3.0
maven-project-info-plugin : 2.4
maven-javadoc-plugin : 2.8

apart from that maven3 is strict on duplicated modules, parent
resolution (fixing these are trivial as the error messages are
descriptive)

[1] 
https://cwiki.apache.org/MAVEN/maven-3x-site-plugin-migration-from-maven-2x.html

thanks,
--Pradeep
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