Rudder

There is some warning in compiling Rudder 3.0 :

These one, we can't do much, and they are here because of Guava:

[WARNING] warning: Class javax.annotation.Nullable not found - continuing with a stub.
[WARNING] warning: Class javax.annotation.Nullable not found - continuing with a stub.
[WARNING] warning: Class javax.annotation.Nullable not found - continuing with a stub.
[WARNING] warning: Class javax.annotation.Nullable not found - continuing with a stub.
[WARNING] warning: Class javax.annotation.Nullable not found - continuing with a stub.
[WARNING] warning: Class javax.annotation.CheckReturnValue not found - continuing with a stub.
[WARNING] warning: Class javax.annotation.Nullable not found - continuing with a stub.
[WARNING] warning: Class javax.annotation.Nullable not found - continuing with a stub.

This one, we can't do anything (I was the one reporting the problem):

[WARNING] warning: While parsing annotations in /home/fanf/.m2/repository/com/unboundid/unboundid-ldapsdk/2.3.6/unboundid-ldapsdk-2.3.6.jar(com/unboundid/util/ThreadSafetyLevel.class
), could not find COMPLETELY_THREADSAFE in enum object ThreadSafetyLevel.
[INFO] This is likely due to an implementation restriction: an annotation argument cannot refer to a member of the annotated class (SI-7014).

These one, we should be able to remove:

[WARNING] warning: there were 1 deprecation warning(s); re-run with -deprecation for details
[WARNING] warning: there were 2 unchecked warning(s); re-run with -unchecked for details
[WARNING] warning: there were 5 feature warning(s); re-run with -feature for details
[WARNING] warning: there were 2 deprecation warning(s); re-run with -deprecation for details
[WARNING] warning: there were 20 deprecation warning(s); re-run with -deprecation for details
[WARNING] warning: there were 12 feature warning(s); re-run with -feature for details

This one is "ok", but it may change in the future: remove it.

[WARNING] /home/fanf/java/workspaces/rudder-project/rudder/rudder-core/src/main/scala/com/normation/rudder/repository/jdbc/ExpectedReportsJdbcRepository.scala:964: warning: match may
 not be exhaustive.
[WARNING] It would fail on the following input: List(_)
[WARNING]         case t => t.sliding(2).map {
[WARNING]                                    ^

This one is clearly a problem:

[WARNING] /home/fanf/java/workspaces/rudder-project/rudder/rudder-web/src/main/scala/com/normation/rudder/web/snippet/administration/PropertiesManagement.scala:512: warning: a pure e
xpression does nothing in statement position; you may be omitting necessary parentheses
[WARNING]       "ok" 
[WARNING]       ^