diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/AbstractPhase.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/AbstractPhase.java
index 36ec29d89fdfcc2c505778ab0c1a07be7b02bc83..2ea187e1b0c61feb6d67db7fec58ccc1144ee7be 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/AbstractPhase.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/AbstractPhase.java
@@ -4,6 +4,7 @@ package cz.muni.ics.kypo.training.adaptive.domain;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.Inheritance;
 import javax.persistence.InheritanceType;
@@ -17,7 +18,7 @@ import java.io.Serializable;
 public abstract class AbstractPhase implements Serializable {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
     private String title;
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/DecisionMatrixRow.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/DecisionMatrixRow.java
index b2c12701f723fb365abedb62ba2345c0d8883b4f..0f383b0ef04cd4673b7103d99dc4128b66ff49ac 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/DecisionMatrixRow.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/DecisionMatrixRow.java
@@ -4,6 +4,7 @@ import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.ManyToOne;
 import java.io.Serializable;
@@ -12,7 +13,7 @@ import java.io.Serializable;
 public class DecisionMatrixRow implements Serializable {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
     @Column(name = "order_in_phase", nullable = false)
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Question.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Question.java
index 838222863fd492c6e08359db44f1af5daf06e89c..636214aa12380ecfcb5790e397b03633bc597cca 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Question.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Question.java
@@ -9,6 +9,7 @@ import javax.persistence.EnumType;
 import javax.persistence.Enumerated;
 import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.ManyToMany;
 import javax.persistence.ManyToOne;
@@ -25,7 +26,7 @@ import java.util.Set;
 public class Question implements Serializable  {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
     @Enumerated(EnumType.STRING)
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionChoice.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionChoice.java
index 45f90ba31ee274b37389539415b74f6cf2ec8beb..c681f6be582e8bcd7bd6784e5405f3cdafb5dd46 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionChoice.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionChoice.java
@@ -4,6 +4,7 @@ import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.ManyToOne;
 import java.io.Serializable;
@@ -12,7 +13,7 @@ import java.io.Serializable;
 public class QuestionChoice implements Serializable {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
     private String text;
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionPhaseRelation.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionPhaseRelation.java
index 8321edc05dc370892ebff33c500ebc638bb89ba9..b31dfe099f908c5cc3415b33ae35d5b9c0cc410c 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionPhaseRelation.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionPhaseRelation.java
@@ -5,6 +5,7 @@ import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.JoinTable;
@@ -17,7 +18,7 @@ import java.util.Set;
 public class QuestionPhaseRelation implements Serializable {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
     @Column(name = "order_in_questionnaire", nullable = false)
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Task.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Task.java
index 944643090b8f07f3d66f7056d09a61a9e1907318..e5515722d9724e9a31b326f3ab0afc5cefe4cd08 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Task.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Task.java
@@ -4,6 +4,7 @@ import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.ManyToOne;
 import java.io.Serializable;
@@ -13,7 +14,7 @@ import java.io.Serializable;
 public class Task implements Serializable {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
     private String title;