Fix warnings 2 (#1130)

* FIX: warnings (add generics, overrides, fix imports) - should be no effecive code change

* replaced deprecated methods by default methods

* FIX: more compiler warnings

* FIX more warnings - no code changes

* FIX: deprecated call to JsonParseException

* Remove unused code, check unused variables

src/test/java/org/tests/timezone/TimezoneTests.java

@@ -70,6 +70,7 @@ public class TimezoneTests {
     TimeZone.setDefault(TimeZone.getTimeZone(zone));
   }
 
+  @SuppressWarnings("unused")
   private void insert(String zone) throws SQLException {
 
     String insert = "insert into tztest (zone, ts, tstz, ts1, tstz1) values (?,?,?,?,?)";