add validation

src/main/java/com/faf223/expensetrackerfaf/model/Expense.java

@@ -1,7 +1,13 @@
 package com.faf223.expensetrackerfaf.model;
+
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import jakarta.persistence.*;
-import lombok.*;
+import jakarta.validation.constraints.DecimalMin;
+import jakarta.validation.constraints.NotNull;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
 
 import java.math.BigDecimal;
 import java.time.LocalDate;
@@ -24,9 +30,14 @@ public class Expense implements IMoneyTransaction {
 
     @ManyToOne
     @JoinColumn(name = "category_id")
+    @NotNull
     private ExpenseCategory category;
 
+    @NotNull
     private LocalDate date;
+
+    @NotNull
+    @DecimalMin(value = "0.0", inclusive = false)
     private BigDecimal amount;
 
     public Expense(LocalDate date, BigDecimal amount) {

src/main/java/com/faf223/expensetrackerfaf/model/ExpenseCategory.java

@@ -1,6 +1,8 @@
 package com.faf223.expensetrackerfaf.model;
 
 import jakarta.persistence.*;
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
 import lombok.Data;
 
 @Data
@@ -12,5 +14,7 @@ public class ExpenseCategory implements IMoneyTransactionCategory {
     private Long id;
 
     @Column(name = "category_name")
+    @NotNull(message = "Name must not be null")
+    @NotEmpty(message = "Name must not be empty")
     private String name;
 }

src/main/java/com/faf223/expensetrackerfaf/model/Income.java

@@ -2,6 +2,8 @@ package com.faf223.expensetrackerfaf.model;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import jakarta.persistence.*;
+import jakarta.validation.constraints.DecimalMin;
+import jakarta.validation.constraints.NotNull;
 import lombok.*;
 
 import java.math.BigDecimal;
@@ -25,9 +27,14 @@ public class Income implements IMoneyTransaction {
 
     @ManyToOne
     @JoinColumn(name = "category_id")
+    @NotNull
     private IncomeCategory category;
 
+    @NotNull
     private LocalDate date;
+
+    @NotNull
+    @DecimalMin(value = "0.0", inclusive = false)
     private BigDecimal amount;
 
     public Income(IncomeCategory incomeCategory, LocalDate date, BigDecimal amount) {

src/main/java/com/faf223/expensetrackerfaf/model/IncomeCategory.java

@@ -1,6 +1,8 @@
 package com.faf223.expensetrackerfaf.model;
 
 import jakarta.persistence.*;
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
 import lombok.Data;
 
 @Data
@@ -12,6 +14,8 @@ public class IncomeCategory implements IMoneyTransactionCategory {
     private Long id;
 
     @Column(name = "category_name")
+    @NotNull(message = "Name must not be null")
+    @NotEmpty(message = "Name must not be empty")
     private String name;
 }
 

src/main/java/com/faf223/expensetrackerfaf/model/User.java

@@ -1,6 +1,8 @@
 package com.faf223.expensetrackerfaf.model;
 
 import jakarta.persistence.*;
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
 import lombok.*;
 
 import java.util.List;
@@ -17,15 +19,23 @@ public class User {
     private String userUuid;
 
     @Column(name = "name")
+    @NotNull(message = "First name must not be null")
+    @NotEmpty(message = "First name must not be empty")
     private String firstName;
 
     @Column(name = "surname")
+    @NotNull(message = "Last name must not be null")
+    @NotEmpty(message = "Last name must not be empty")
     private String lastName;
 
     @Column(name = "username")
+    @NotNull(message = "Username must not be null")
+    @NotEmpty(message = "Username must not be empty")
     private String username;
 
     @Transient
+    @NotNull(message = "Password must not be null")
+    @NotEmpty(message = "Password must not be empty")
     private String password;
 
     @OneToMany(mappedBy = "user", fetch = FetchType.LAZY)