diff --git a/ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/PlatformUser.java b/ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/PlatformUser.java
index 2ea465e..d8bc61a 100644
--- a/ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/PlatformUser.java
+++ b/ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/PlatformUser.java
@@ -2,10 +2,10 @@ package dst.ass1.jpa.model.impl;
 
 import dst.ass1.jpa.model.IPlatformUser;
 
+import javax.persistence.Column;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 import javax.persistence.MappedSuperclass;
-import javax.validation.constraints.NotNull;
 import java.io.Serializable;
 
 @MappedSuperclass
@@ -15,7 +15,7 @@ public class PlatformUser implements IPlatformUser, Serializable {
 
     protected String name;
 
-    @NotNull
+    @Column(nullable = false)
     protected String tel;
 
     protected Double avgRating;
diff --git a/ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/Rider.java b/ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/Rider.java
index b5572cc..7db3679 100644
--- a/ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/Rider.java
+++ b/ass1-jpa/src/main/java/dst/ass1/jpa/model/impl/Rider.java
@@ -14,7 +14,7 @@ import static dst.ass1.jpa.util.Constants.*;
 @Entity
 @Table(uniqueConstraints = @UniqueConstraint(columnNames = {M_RIDER_ACCOUNT, M_RIDER_BANK_CODE}))
 public class Rider extends PlatformUser implements IRider {
-    @Column(unique = true) @NotNull
+    @Column(unique = true, nullable = false)
     private String email;
 
     @Column(columnDefinition = "VARBINARY(20)", length = 20)