Use try with resources for dao layer

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/operation/mgt/dao/impl/GenericOperationDAOImpl.java

@@ -130,11 +130,8 @@ public class GenericOperationDAOImpl implements OperationDAO {
 
     public int updateOperationByDeviceTypeAndInitialStatus(String deiceType, String initialStatus, String requiredStatus)
             throws OperationManagementDAOException {
-        PreparedStatement stmt = null;
         int numOfRecordsUpdated;
-        try {
         long time = DeviceManagementDAOUtil.getCurrentUTCTime();
-            Connection connection = OperationManagementDAOFactory.getConnection();
 
         String sql = "UPDATE DM_ENROLMENT_OP_MAPPING SET STATUS=?, UPDATED_TIMESTAMP=? WHERE DEVICE_TYPE=?";
 
@@ -144,7 +141,10 @@ public class GenericOperationDAOImpl implements OperationDAO {
             sql += " AND STATUS=?";
         }
 
-            stmt = connection.prepareStatement(sql);
+        try (
+                Connection connection = OperationManagementDAOFactory.getConnection();
+                PreparedStatement stmt = connection.prepareStatement(sql)
+        ) {
             stmt.setString(1, requiredStatus);
             stmt.setLong(2, time);
             stmt.setString(3, deiceType);
@@ -156,8 +156,6 @@ public class GenericOperationDAOImpl implements OperationDAO {
         } catch (SQLException e) {
             throw new OperationManagementDAOException("Error occurred while update device mapping operation status " +
                     e.getMessage(), e);
-        } finally {
-            OperationManagementDAOUtil.cleanupResources(stmt);
         }
         return numOfRecordsUpdated;
     }