Resolve warnings

src/main/java/org/crophub/rest/common/security/AsAdminInvoker.java

@@ -26,7 +26,7 @@ import org.springframework.stereotype.Service;
 public class AsAdminInvoker {
 
     @AsAdmin
-    public void invoke(Callable callable) throws Exception {
+    public void invoke(Callable<?> callable) throws Exception {
         callable.call();
     }
 

src/main/java/org/crophub/spring/validation/oval/spring/SpringOvalValidator.java

@@ -47,8 +47,7 @@ public class SpringOvalValidator implements org.springframework.validation.Valid
         this.validator = validator;
     }
 
-    @SuppressWarnings("unchecked")
-    public boolean supports(Class clazz) {
+    public boolean supports(Class<?> clazz) {
         return true;
     }
 
@@ -56,7 +55,6 @@ public class SpringOvalValidator implements org.springframework.validation.Valid
         doValidate(target, errors, "");
     }
 
-    @SuppressWarnings("unchecked")
     private void doValidate(Object target, Errors errors, String fieldPrefix) {
         try {
             for (ConstraintViolation violation : validator.validate(target)) {
@@ -128,15 +126,13 @@ public class SpringOvalValidator implements org.springframework.validation.Valid
         }
     }
 
-    @SuppressWarnings("unchecked")
     private Field[] getFields(Object target) {
-        Class clazz = target.getClass();
+        Class<?> clazz = target.getClass();
         List<Field> fields = doGetFields(clazz);
         return fields.toArray(new Field[fields.size()]);
     }
 
-    @SuppressWarnings("unchecked")
-    private List<Field> doGetFields(Class clazz) {
+    private List<Field> doGetFields(Class<?> clazz) {
         ArrayList<Field> list = new ArrayList<Field>();
         Field[] fields = clazz.getDeclaredFields();
         list.addAll(Arrays.asList(fields));