Make use of ConstraintValidator initialize method.

application/src/main/java/gd/assignment/validation/CheckWKTValidator.java

@@ -10,13 +10,13 @@ import org.geotools.geometry.text.WKTParser;
 import org.geotools.referencing.crs.DefaultGeographicCRS;
 
 public class CheckWKTValidator implements ConstraintValidator<CheckWKT, String> {
-    private WKTParser wktParser = new WKTParser(
-        new GeometryBuilder(DefaultGeographicCRS.WGS84)
-    );
+    private WKTParser wktParser;
 
     @Override
     public void initialize(CheckWKT constraintAnnotation) {
-        // NO-OP
+        wktParser = new WKTParser(
+            new GeometryBuilder(DefaultGeographicCRS.WGS84)
+        );
     }
 
     @Override