add id generation strategy

driver-microservice/src/main/java/edu/microserviceslab/drivermicroservice/entity/Driver.java

@@ -4,16 +4,13 @@ import org.apache.commons.lang3.builder.EqualsBuilder;
 import org.apache.commons.lang3.builder.HashCodeBuilder;
 import org.apache.commons.lang3.builder.ToStringBuilder;
 
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.Id;
+import javax.persistence.*;
 
 @Entity(name = "driver")
 public class Driver {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "id")
     private Long id;
 

usage-microservice/src/main/java/edu/microserviceslab/usagemicroservice/entity/UsageStatistic.java

@@ -12,7 +12,7 @@ import java.util.Date;
 public class UsageStatistic {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "id")
     private Long id;
 

vehicle-microservice/src/main/java/edu/microserviceslab/vehiclemicroservice/entity/Registration.java

@@ -4,16 +4,13 @@ import org.apache.commons.lang3.builder.EqualsBuilder;
 import org.apache.commons.lang3.builder.HashCodeBuilder;
 import org.apache.commons.lang3.builder.ToStringBuilder;
 
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.Id;
+import javax.persistence.*;
 
 @Entity(name = "registration")
 public class Registration {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "id")
     private Long id;
 

vehicle-microservice/src/main/java/edu/microserviceslab/vehiclemicroservice/entity/Vehicle.java

@@ -10,7 +10,7 @@ import javax.persistence.*;
 public class Vehicle {
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "id")
     private Long id;