added @GeneratedValue(strategy = GenerationType.IDENTITY) for postgres

src/main/java/de/kreth/invoice/data/BaseEntity.java

@@ -5,6 +5,7 @@ import java.time.LocalDateTime;
 
 import javax.persistence.Column;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.MappedSuperclass;
 import javax.persistence.PrePersist;
@@ -20,7 +21,7 @@ public abstract class BaseEntity implements Serializable {
     private static final long serialVersionUID = 6953593432069408729L;
 
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
     @Column(name = "created")
     @CreationTimestamp

src/main/java/de/kreth/invoice/data/UserAdress.java

@@ -5,6 +5,8 @@ import java.time.LocalDateTime;
 
 import javax.persistence.Column;
 import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.MapsId;
@@ -22,6 +24,7 @@ public class UserAdress implements Cloneable, Serializable {
     private static final long serialVersionUID = -8104370538500175340L;
 
     @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "USER_ID")
     private Long id;
 

src/main/java/de/kreth/invoice/data/UserBank.java

@@ -5,6 +5,8 @@ import java.time.LocalDateTime;
 
 import javax.persistence.Column;
 import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.MapsId;
@@ -22,6 +24,7 @@ public class UserBank implements Cloneable, Serializable {
     private static final long serialVersionUID = -7356424394007978241L;
 
     @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "USER_ID")
     private Long id;