Fix warnings (#1129)

* 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

src/test/java/org/tests/transaction/TestBatchModelFlush.java

@@ -8,6 +8,7 @@ import org.tests.model.m2m.MnyB;
 
 public class TestBatchModelFlush extends BaseTestCase {
 
+  @SuppressWarnings("static-access")
   @Transactional(batchSize = 50)
   @Test
   public void insert() {