diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/Worker.java b/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/Worker.java
index 23a2a05dd..7fd86bb4b 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/Worker.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/Worker.java
@@ -24,6 +24,7 @@ import java.util.ArrayList;
 import java.util.Set;
 
 import org.hibernate.validator.NotEmpty;
+import org.hibernate.validator.NotNull;
 
 /**
  * This class models a worker.
@@ -44,6 +45,7 @@ public class Worker extends Resource {
         return worker;
     }
 
+    @NotNull
     @NotEmpty
     private String firstName;
 
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/workreports/entities/WorkReport.java b/navalplanner-business/src/main/java/org/navalplanner/business/workreports/entities/WorkReport.java
index b836708f3..1df120f29 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/workreports/entities/WorkReport.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/workreports/entities/WorkReport.java
@@ -26,6 +26,7 @@ import java.util.Set;
 
 import org.hibernate.validator.NotEmpty;
 import org.hibernate.validator.NotNull;
+import org.hibernate.validator.Valid;
 import org.navalplanner.business.common.BaseEntity;
 
 /**
@@ -61,6 +62,7 @@ public class WorkReport extends BaseEntity {
 
     private WorkReportType workReportType;
 
+    @Valid
     private Set<WorkReportLine> workReportLines = new HashSet<WorkReportLine>();
 
     /**
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/workreports/entities/WorkReportLine.java b/navalplanner-business/src/main/java/org/navalplanner/business/workreports/entities/WorkReportLine.java
index 0f2619f87..4fb038fb2 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/workreports/entities/WorkReportLine.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/workreports/entities/WorkReportLine.java
@@ -56,10 +56,9 @@ public class WorkReportLine extends BaseEntity {
 
     private Integer numHours;
 
-    @NotNull
+
     private Resource resource;
 
-    @NotNull
     private OrderElement orderElement;
 
     private WorkReport workReport;
@@ -89,6 +88,7 @@ public class WorkReportLine extends BaseEntity {
         this.numHours = numHours;
     }
 
+    @NotNull
     public Resource getResource() {
         return resource;
     }
@@ -97,6 +97,7 @@ public class WorkReportLine extends BaseEntity {
         this.resource = resource;
     }
 
+    @NotNull
     public OrderElement getOrderElement() {
         return orderElement;
     }
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/daos/TaskElementDAOTest.java b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/daos/TaskElementDAOTest.java
index a0be21248..9f7836abd 100644
--- a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/daos/TaskElementDAOTest.java
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/daos/TaskElementDAOTest.java
@@ -29,7 +29,6 @@ import static org.junit.Assert.assertTrue;
 import static org.navalplanner.business.BusinessGlobalNames.BUSINESS_SPRING_CONFIG_FILE;
 import static org.navalplanner.business.test.BusinessGlobalNames.BUSINESS_SPRING_CONFIG_TEST_FILE;
 
-import java.util.Arrays;
 import java.util.Date;
 import java.util.List;
 
@@ -37,8 +36,6 @@ import javax.annotation.Resource;
 
 import org.hibernate.SessionFactory;
 import org.junit.Before;
-import org.hibernate.validator.ClassValidator;
-import org.hibernate.validator.InvalidValue;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.navalplanner.business.IDataBootstrap;
@@ -164,12 +161,6 @@ public class TaskElementDAOTest {
     @Test
     public void canSaveMilestone() {
         TaskMilestone milestone = createValidTaskMilestone();
-        ClassValidator<TaskMilestone> validator = new ClassValidator<TaskMilestone>(
-                TaskMilestone.class);
-        InvalidValue[] invalidValues = validator.getInvalidValues(milestone);
-        if (invalidValues.length > 0) {
-            throw new RuntimeException(Arrays.toString(invalidValues));
-        }
         taskElementDAO.save(milestone);
         flushAndEvict(milestone);
         TaskElement fromDB;
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeModel.java
index 4d4466026..7bb6a13fe 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeModel.java
@@ -26,8 +26,6 @@ import java.math.BigDecimal;
 import java.util.List;
 
 import org.apache.commons.lang.Validate;
-import org.hibernate.validator.ClassValidator;
-import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.advance.daos.IAdvanceTypeDAO;
 import org.navalplanner.business.advance.entities.AdvanceType;
 import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
@@ -49,9 +47,6 @@ public class AdvanceTypeModel implements IAdvanceTypeModel {
 
     private AdvanceType advanceType;
 
-    private ClassValidator<AdvanceType> advanceTypeValidator = new ClassValidator<AdvanceType>(
-            AdvanceType.class);
-
     @Autowired
     private IAdvanceTypeDAO advanceTypeDAO;
 
@@ -104,11 +99,6 @@ public class AdvanceTypeModel implements IAdvanceTypeModel {
     @Override
     @Transactional
     public void save() throws ValidationException {
-        InvalidValue[] invalidValues = advanceTypeValidator
-                .getInvalidValues(advanceType);
-        if (invalidValues.length > 0) {
-            throw new ValidationException(invalidValues);
-        }
         advanceTypeDAO.save(advanceType);
         checkCanBeModified(advanceType);
     }
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarModel.java
index d762011fb..b4bb3ed21 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarModel.java
@@ -26,7 +26,6 @@ import java.util.Date;
 import java.util.List;
 
 import org.apache.commons.lang.Validate;
-import org.hibernate.validator.ClassValidator;
 import org.hibernate.validator.InvalidValue;
 import org.joda.time.LocalDate;
 import org.navalplanner.business.calendars.daos.IBaseCalendarDAO;
@@ -64,9 +63,6 @@ public class BaseCalendarModel implements IBaseCalendarModel {
 
     protected boolean editing = false;
 
-    private ClassValidator<BaseCalendar> baseCalendarValidator = new ClassValidator<BaseCalendar>(
-            BaseCalendar.class);
-
     @Autowired
     private IBaseCalendarDAO baseCalendarDAO;
 
@@ -430,12 +426,6 @@ public class BaseCalendarModel implements IBaseCalendarModel {
     @Override
     public void checkInvalidValuesCalendar(BaseCalendar entity)
             throws ValidationException {
-        InvalidValue[] invalidValues = baseCalendarValidator
-        .getInvalidValues(entity);
-        if (invalidValues.length > 0) {
-            throw new ValidationException(invalidValues);
-        }
-
         if (baseCalendarDAO.thereIsOtherWithSameName(entity)) {
             InvalidValue[] invalidValues2 = { new InvalidValue(_(
                     "{0} already exists", entity.getName()),
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/labels/LabelTypeModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/labels/LabelTypeModel.java
index f83a7a2b7..3ccce54d4 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/labels/LabelTypeModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/labels/LabelTypeModel.java
@@ -23,11 +23,9 @@ package org.navalplanner.web.labels;
 import static org.navalplanner.web.I18nHelper._;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 import org.apache.commons.lang.Validate;
-import org.hibernate.validator.ClassValidator;
 import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
 import org.navalplanner.business.common.exceptions.ValidationException;
@@ -53,12 +51,6 @@ public class LabelTypeModel implements ILabelTypeModel {
 
     private LabelType labelType;
 
-    private ClassValidator<LabelType> validatorLabelType = new ClassValidator<LabelType>(
-            LabelType.class);
-
-    private ClassValidator<Label> validatorLabel = new ClassValidator<Label>(
-            Label.class);
-
     public LabelTypeModel() {
 
     }
@@ -92,64 +84,16 @@ public class LabelTypeModel implements ILabelTypeModel {
     @Override
     @Transactional
     public void confirmSave() throws ValidationException {
-        ArrayList<InvalidValue> invalidValues = new ArrayList<InvalidValue>();
-
-        // Check properties
-        invalidValues.addAll(checkLabelTypeProperties());
-        invalidValues.addAll(checkLabelsProperties());
-        if (invalidValues.size() > 0) {
-            throw new ValidationException(invalidValues
-                    .toArray(new InvalidValue[0]));
-        }
-
-        // Check elements are unique
-        invalidValues.addAll(checkLabelTypeUnique());
-        invalidValues.addAll(checkLabelsUnique());
-        if (invalidValues.size() > 0) {
-            throw new ValidationException(invalidValues
-                    .toArray(new InvalidValue[0]));
-        }
+        checkLabelTypeUnique();
+        checkLabelsUnique();
 
         labelTypeDAO.save(labelType);
     }
 
-    /**
-     * Check errors in {@link LabelType}
-     *
-     * @return
-     */
-    private List<InvalidValue> checkLabelTypeProperties() {
-        List<InvalidValue> result = new ArrayList<InvalidValue>();
-        result.addAll(Arrays.asList(validatorLabelType
-                .getInvalidValues(labelType)));
-        return result;
-    }
-
-    /**
-     * Check errors in {@link Label}
-     *
-     * @return
-     */
-    private List<InvalidValue> checkLabelsProperties() {
-        List<InvalidValue> result = new ArrayList<InvalidValue>();
-        for (Label label : labelType.getLabels()) {
-            result.addAll(Arrays.asList(validatorLabel
-                            .getInvalidValues(label)));
-        }
-        return result;
-    }
-
-    /**
-     * Check {@link LabelType} name is unique
-     *
-     * @return
-     */
-    private List<InvalidValue> checkLabelTypeUnique() {
-        List<InvalidValue> result = new ArrayList<InvalidValue>();
+    private void checkLabelTypeUnique() {
         if (!labelTypeDAO.isUnique(labelType)) {
-            result.add(createInvalidValue(labelType));
+            throw new ValidationException(createInvalidValue(labelType));
         }
-        return result;
     }
 
     private InvalidValue createInvalidValue(LabelType labelType) {
@@ -164,9 +108,8 @@ public class LabelTypeModel implements ILabelTypeModel {
      * @return
      * @throws ValidationException
      */
-    private List<InvalidValue> checkLabelsUnique() throws ValidationException {
+    private void checkLabelsUnique() throws ValidationException {
         List<InvalidValue> result = new ArrayList<InvalidValue>();
-
         List<Label> labels = new ArrayList<Label>(labelType.getLabels());
         for (int i = 0; i < labels.size(); i++) {
             for (int j = i + 1; j < labels.size(); j++) {
@@ -175,7 +118,9 @@ public class LabelTypeModel implements ILabelTypeModel {
                 }
             }
         }
-        return result;
+        if (!result.isEmpty()) {
+            throw new ValidationException(result.toArray(new InvalidValue[0]));
+        }
     }
 
     private InvalidValue createInvalidValue(Label label) {
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/orders/OrderModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/orders/OrderModel.java
index be7f13744..82cd834da 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/orders/OrderModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/orders/OrderModel.java
@@ -32,8 +32,6 @@ import java.util.Map;
 import java.util.Set;
 
 import org.apache.commons.lang.Validate;
-import org.hibernate.validator.ClassValidator;
-import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.advance.entities.AdvanceMeasurement;
 import org.navalplanner.business.advance.entities.DirectAdvanceAssignment;
 import org.navalplanner.business.advance.entities.IndirectAdvanceAssignment;
@@ -83,9 +81,6 @@ public class OrderModel implements IOrderModel {
 
     private Order order;
 
-    private ClassValidator<Order> orderValidator = new ClassValidator<Order>(
-            Order.class);
-
     private OrderElementTreeModel orderElementTreeModel;
 
     @Autowired
@@ -218,11 +213,6 @@ public class OrderModel implements IOrderModel {
     @Transactional
     public void save() throws ValidationException {
         reattachCriterions();
-        InvalidValue[] invalidValues = orderValidator.getInvalidValues(order);
-        if (invalidValues.length > 0) {
-            throw new ValidationException(invalidValues);
-        }
-
         order.checkValid();
         this.orderDAO.save(order);
         deleteOrderElementNotParent();
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel.java
index 7b3fe2f21..c16425142 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel.java
@@ -29,7 +29,6 @@ import java.util.List;
 import org.apache.commons.lang.Validate;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.hibernate.validator.ClassValidator;
 import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
 import org.navalplanner.business.common.exceptions.ValidationException;
@@ -58,9 +57,6 @@ public class CriterionsModel implements ICriterionsModel {
 
     private static final Log log = LogFactory.getLog(CriterionsModel.class);
 
-    private ClassValidator<Criterion> criterionValidator = new ClassValidator<Criterion>(
-            Criterion.class);
-
     @Autowired
     private ICriterionDAO criterionDAO;
 
@@ -120,11 +116,6 @@ public class CriterionsModel implements ICriterionsModel {
     @Override
     @Transactional
     public void saveCriterion() throws ValidationException {
-        InvalidValue[] invalidValues = criterionValidator
-                .getInvalidValues(criterion);
-        if (invalidValues.length > 0) {
-            throw new ValidationException(invalidValues);
-        }
         try {
             save(criterion);
         } finally {
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel_V2.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel_V2.java
index 2953b5666..c7ffde3b9 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel_V2.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel_V2.java
@@ -29,8 +29,6 @@ import java.util.List;
 import org.apache.commons.lang.Validate;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.hibernate.validator.ClassValidator;
-import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
 import org.navalplanner.business.common.exceptions.ValidationException;
 import org.navalplanner.business.resources.daos.ICriterionDAO;
@@ -57,9 +55,6 @@ public class CriterionsModel_V2 implements ICriterionsModel_V2 {
 
     private static final Log log = LogFactory.getLog(CriterionsModel.class);
 
-    private ClassValidator<CriterionType> criterionTypeValidator = new ClassValidator<CriterionType>(
-            CriterionType.class);
-
     @Autowired
     private ICriterionDAO criterionDAO;
 
@@ -161,11 +156,6 @@ public class CriterionsModel_V2 implements ICriterionsModel_V2 {
     @Override
     @Transactional
     public void saveCriterionType() throws ValidationException {
-        InvalidValue[] invalidValues = criterionTypeValidator
-                .getInvalidValues(criterionType);
-        if (invalidValues.length > 0) {
-            throw new ValidationException(invalidValues);
-        }
         criterionTreeModel.saveCriterions(criterionType);
         criterionTypeDAO.save(criterionType);
     }
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/machine/AssignedMachineCriterionsModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/machine/AssignedMachineCriterionsModel.java
index b125e7c91..8b02fabc4 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/machine/AssignedMachineCriterionsModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/machine/AssignedMachineCriterionsModel.java
@@ -8,7 +8,6 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
-import org.hibernate.validator.ClassValidator;
 import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.common.exceptions.ValidationException;
 import org.navalplanner.business.resources.daos.ICriterionTypeDAO;
@@ -39,12 +38,6 @@ import org.zkoss.zk.ui.WrongValueException;
 @Scope(BeanDefinition.SCOPE_PROTOTYPE)
 public class AssignedMachineCriterionsModel implements IAssignedMachineCriterionsModel {
 
-    private ClassValidator<CriterionSatisfactionDTO> satisfactionDTOValidator = new ClassValidator<CriterionSatisfactionDTO>(
-            CriterionSatisfactionDTO.class);
-
-    private ClassValidator<CriterionSatisfactionDTO> satisfactionValidator = new ClassValidator<CriterionSatisfactionDTO>(
-            CriterionSatisfactionDTO.class);
-
     @Autowired
     private IResourceDAO resourceDAO;
 
@@ -300,13 +293,7 @@ public class AssignedMachineCriterionsModel implements IAssignedMachineCriterion
     }
 
     public void save() throws ValidationException {
-        InvalidValue[] invalidValues;
         for (CriterionSatisfactionDTO satisfactionDTO : this.criterionSatisfactionDTOs) {
-            invalidValues = satisfactionValidator
-                    .getInvalidValues(satisfactionDTO);
-            if (invalidValues.length > 0) {
-                throw new ValidationException(invalidValues);
-            }
             save(satisfactionDTO);
         }
     }
@@ -361,12 +348,6 @@ public class AssignedMachineCriterionsModel implements IAssignedMachineCriterion
         Set<CriterionSatisfactionDTO> listDTOs = new HashSet<CriterionSatisfactionDTO>(
                 criterionSatisfactionDTOs);
         for (CriterionSatisfactionDTO satisfactionDTO : listDTOs) {
-            InvalidValue[] invalidValues;
-            invalidValues = satisfactionDTOValidator
-                    .getInvalidValues(satisfactionDTO);
-            if (invalidValues.length > 0) {
-                throw new ValidationException(invalidValues);
-            }
             Criterion criterion = satisfactionDTO.getCriterionWithItsType()
                     .getCriterion();
             if (checkSameCriterionAndSameInterval(satisfactionDTO)) {
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/machine/MachineModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/machine/MachineModel.java
index ef11641db..32426b701 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/machine/MachineModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/machine/MachineModel.java
@@ -24,8 +24,6 @@ import java.util.List;
 import java.util.Set;
 
 import org.apache.commons.lang.Validate;
-import org.hibernate.validator.ClassValidator;
-import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.calendars.daos.IBaseCalendarDAO;
 import org.navalplanner.business.calendars.entities.BaseCalendar;
 import org.navalplanner.business.calendars.entities.ResourceCalendar;
@@ -62,8 +60,6 @@ public class MachineModel implements IMachineModel {
 
     private Machine machine;
 
-    private ClassValidator<Machine> validator = new ClassValidator<Machine>(Machine.class);
-
     @Autowired
     @Qualifier("subclass")
     private IBaseCalendarModel baseCalendarModel;
@@ -90,10 +86,6 @@ public class MachineModel implements IMachineModel {
         if (machine.getCalendar() != null) {
             baseCalendarModel.checkInvalidValuesCalendar(machine.getCalendar());
         }
-        InvalidValue[] invalidValues = validator.getInvalidValues(getMachine());
-        if (invalidValues.length > 0) {
-            throw new ValidationException(invalidValues);
-        }
         resourceDAO.save(machine);
     }
 
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/worker/AssignedCriterionsModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/worker/AssignedCriterionsModel.java
index 6711d19c0..f788bf9af 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/worker/AssignedCriterionsModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/worker/AssignedCriterionsModel.java
@@ -12,12 +12,9 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
-import org.hibernate.validator.ClassValidator;
-import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.common.exceptions.ValidationException;
 import org.navalplanner.business.resources.daos.ICriterionTypeDAO;
 import org.navalplanner.business.resources.daos.IResourceDAO;
-import org.navalplanner.business.resources.daos.IWorkerDAO;
 import org.navalplanner.business.resources.entities.Criterion;
 import org.navalplanner.business.resources.entities.CriterionSatisfaction;
 import org.navalplanner.business.resources.entities.CriterionType;
@@ -41,18 +38,9 @@ import org.zkoss.zk.ui.WrongValueException;
 @Scope(BeanDefinition.SCOPE_PROTOTYPE)
 public class AssignedCriterionsModel implements IAssignedCriterionsModel {
 
-    private ClassValidator<CriterionSatisfactionDTO> satisfactionDTOValidator = new ClassValidator<CriterionSatisfactionDTO>(
-            CriterionSatisfactionDTO.class);
-
-    private ClassValidator<CriterionSatisfaction> satisfactionValidator = new ClassValidator<CriterionSatisfaction>(
-            CriterionSatisfaction.class);
-
     @Autowired
     private IResourceDAO resourceDAO;
 
-    @Autowired
-    private IWorkerDAO workerDAO;
-
     @Autowired
     private ICriterionTypeDAO criterionTypeDAO;
 
@@ -310,12 +298,6 @@ public class AssignedCriterionsModel implements IAssignedCriterionsModel {
         Set<CriterionSatisfactionDTO> listDTOs = new HashSet<CriterionSatisfactionDTO>(
                 criterionSatisfactionDTOs);
         for (CriterionSatisfactionDTO satisfactionDTO : listDTOs) {
-            InvalidValue[] invalidValues;
-            invalidValues = satisfactionDTOValidator
-                    .getInvalidValues(satisfactionDTO);
-            if (invalidValues.length > 0) {
-                throw new ValidationException(invalidValues);
-            }
             Criterion criterion = satisfactionDTO.getCriterionWithItsType()
                     .getCriterion();
             if (checkSameCriterionAndSameInterval(satisfactionDTO)) {
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/workreports/WorkReportModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/workreports/WorkReportModel.java
index 32d9ecc74..36866be0f 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/workreports/WorkReportModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/workreports/WorkReportModel.java
@@ -24,8 +24,6 @@ import java.util.ArrayList;
 import java.util.List;
 
 import org.apache.commons.lang.Validate;
-import org.hibernate.validator.ClassValidator;
-import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
 import org.navalplanner.business.common.exceptions.ValidationException;
 import org.navalplanner.business.orders.daos.IOrderElementDAO;
@@ -65,12 +63,6 @@ public class WorkReportModel implements IWorkReportModel {
 
     private WorkReport workReport;
 
-    private ClassValidator<WorkReport> workReportValidator = new ClassValidator<WorkReport>(
-            WorkReport.class);
-
-    private ClassValidator<WorkReportLine> workReportLineValidator = new ClassValidator<WorkReportLine>(
-            WorkReportLine.class);
-
     private boolean editing = false;
 
     @Override
@@ -145,22 +137,6 @@ public class WorkReportModel implements IWorkReportModel {
     @Override
     @Transactional
     public void save() throws ValidationException {
-        InvalidValue[] invalidValues = workReportValidator
-                .getInvalidValues(workReport);
-
-        if (invalidValues.length > 0) {
-            throw new ValidationException(invalidValues);
-        }
-
-        // Check WorkReportLines
-        for (WorkReportLine workReportLine : workReport.getWorkReportLines()) {
-            invalidValues = workReportLineValidator
-                    .getInvalidValues(workReportLine);
-
-            if (invalidValues.length > 0) {
-                throw new ValidationException(invalidValues);
-            }
-        }
         workReportDAO.save(workReport);
     }
 
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/workreports/WorkReportTypeModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/workreports/WorkReportTypeModel.java
index 843bd280b..d8108a55c 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/workreports/WorkReportTypeModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/workreports/WorkReportTypeModel.java
@@ -25,8 +25,6 @@ import java.util.List;
 import java.util.Set;
 
 import org.apache.commons.lang.Validate;
-import org.hibernate.validator.ClassValidator;
-import org.hibernate.validator.InvalidValue;
 import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
 import org.navalplanner.business.common.exceptions.ValidationException;
 import org.navalplanner.business.resources.daos.ICriterionTypeDAO;
@@ -57,9 +55,6 @@ public class WorkReportTypeModel implements IWorkReportTypeModel {
 
     private WorkReportType workReportType;
 
-    private ClassValidator<WorkReportType> workReportTypeValidator = new ClassValidator<WorkReportType>(
-            WorkReportType.class);
-
     private boolean editing = false;
 
     @Override
@@ -117,12 +112,6 @@ public class WorkReportTypeModel implements IWorkReportTypeModel {
     @Override
     @Transactional
     public void save() throws ValidationException {
-        InvalidValue[] invalidValues = workReportTypeValidator
-                .getInvalidValues(workReportType);
-        if (invalidValues.length > 0) {
-            throw new ValidationException(invalidValues);
-        }
-
         workReportTypeDAO.save(workReportType);
     }