IDEX-1368 : JDK8 compliant code (also usage of the new org reflections version

Well Intellij only put the static import at this line but this import was already there
if you look at the diff we have
-import static com.codenvy.commons.lang.Strings.nullToEmpty;
and few lines after :
+import static com.codenvy.commons.lang.Strings.nullToEmpty;

it just move out the import but I don't have introduce it