Sonar/Findbugs - Bad practice - Classloaders should only be created inside doPrivileged block

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6282 0c6e7542-c601-0410-84e7-c038aed88b3b
Sonar/Findbugs - Bad practice - Method might ignore exception

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6283 0c6e7542-c601-0410-84e7-c038aed88b3b
Sonar/Findbugs - Malicious code vulnerability - Field should be moved out of an interface

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6284 0c6e7542-c601-0410-84e7-c038aed88b3b
Sonar/Findbugs - Make some classes final if they define a clone() method which do not call super.clone()

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6285 0c6e7542-c601-0410-84e7-c038aed88b3b
Sonar/Findbugs - Performance - Make some fields static

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6286 0c6e7542-c601-0410-84e7-c038aed88b3b