Maven Warning: Ubuntu Users

[Zahid Rahman <za...@gmail.com>]

To all ubuntu Maven  users.

Do NOT  install maven using
sudo apt install maven

Install by  direct download  only  from
https://maven.apache.org/download.cgi

BECAUSE:

"I seem to remember they [ubuntu] have their own build of Maven which
differs from the Apache source.

( https://bugs.launchpad.net/ubuntu/+source/maven/+bug/1754602  suggests
it's a known bug in their packaging/build? )

If you download Maven from http://maven.apache.org/download.cgi and follow
the instructions in http://maven.apache.org/install.html then you shouldn't
see those warnings. "
           ‐-------------------

The Java 11 warning mentions that "/usr/share/maven/lib/guice.jar" has a
class named "com.google.inject.internal.cglib.core.$ReflectUtils$1"

This looks suspect because the official Maven distribution uses the
"no-AOP" version of Guice which doesn't contain any CGLIB classes. It
suggests that whoever provided that copy of Maven has replaced the "no-AOP"
version with the "AOP" version, and this will cause warnings on Java 11.
(The "AOP" version uses CGLIB which currently relies on certain reflective
access that Java 11 warns about - whereas the "no-AOP" version doesn't.)