BAEL-4957 - Spring validation in the service layer (#10811)

spring-boot-modules/spring-boot-servicelayer-validation/.gitignore

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+# Created by https://www.gitignore.io/api/eclipse
+
+### Eclipse ###
+
+.metadata
+target/
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
+.recommenders
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# PyDev specific (Python IDE for Eclipse)
+*.pydevproject
+
+# CDT-specific (C/C++ Development Tooling)
+.cproject
+
+# Java annotation processor (APT)
+.factorypath
+
+# PDT-specific (PHP Development Tools)
+.buildpath
+
+# sbteclipse plugin
+.target
+
+# Tern plugin
+.tern-project
+
+# TeXlipse plugin
+.texlipse
+
+# STS (Spring Tool Suite)
+.springBeans
+
+# Code Recommenders
+.recommenders/
+
+# Scala IDE specific (Scala & Java development for Eclipse)
+.cache-main
+.scala_dependencies
+.worksheet
+
+### Eclipse Patch ###
+# Eclipse Core      
+.project
+
+# JDT-specific (Eclipse Java Development Tools)     
+.classpath
+
+# End of https://www.gitignore.io/api/eclipse

spring-boot-modules/spring-boot-servicelayer-validation/README.md

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+## Spring Service Layer Validation
+
+This module contains articles about validation in Service layer of Spring Boot project.
+

spring-boot-modules/spring-boot-servicelayer-validation/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.baeldung.spring-service-layer-validation</groupId>
+	<artifactId>spring-service-layer-validation</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>12</maven.compiler.source>
+		<maven.compiler.target>12</maven.compiler.target>
+	</properties>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.4.5</version>
+	</parent>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.hibernate.validator</groupId>
+			<artifactId>hibernate-validator</artifactId>
+		</dependency>
+		
+		
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+</project>

spring-boot-modules/spring-boot-servicelayer-validation/src/main/java/com/baeldung/spring/servicevalidation/SpringServiceLayerValidationApp.java

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+package com.baeldung.spring.servicevalidation;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringServiceLayerValidationApp {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringServiceLayerValidationApp.class, args);
+	}
+
+}

spring-boot-modules/spring-boot-servicelayer-validation/src/main/java/com/baeldung/spring/servicevalidation/controller/UserAccountController.java

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+package com.baeldung.spring.servicevalidation.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.spring.servicevalidation.domain.UserAccount;
+import com.baeldung.spring.servicevalidation.service.UserAccountService;
+
+@RestController
+public class UserAccountController {
+
+	@Autowired
+	private UserAccountService service;
+
+	@PostMapping("/addUserAccount")
+	public Object addUserAccount(@RequestBody UserAccount userAccount) {
+		return service.addUserAccount(userAccount);
+	}
+
+}

spring-boot-modules/spring-boot-servicelayer-validation/src/main/java/com/baeldung/spring/servicevalidation/dao/UserAccountDao.java

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+package com.baeldung.spring.servicevalidation.dao;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.stereotype.Service;
+
+import com.baeldung.spring.servicevalidation.domain.UserAccount;
+
+@Service
+public class UserAccountDao {
+	
+	 private Map<String, UserAccount> DB = new HashMap<String, UserAccount>();
+
+	 public String addUserAccount(UserAccount useraccount) {
+		   DB.put(useraccount.getName(), useraccount);
+	       return "success";
+	    }
+
+	    public Collection<UserAccount> getAllUserAccounts() {
+	        
+	    	Collection<UserAccount> list = DB.values();
+	        if(list.isEmpty()) {
+	            list.addAll(DB.values());
+	        }
+	        return list;
+	    	
+	    }
+
+	
+}

spring-boot-modules/spring-boot-servicelayer-validation/src/main/java/com/baeldung/spring/servicevalidation/domain/UserAccount.java

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+package com.baeldung.spring.servicevalidation.domain;
+
+import javax.validation.Valid;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Size;
+
+public class UserAccount {
+
+    @NotNull(message = "Password must be between 4 to 15 characters")
+    @Size(min = 4, max = 15)
+    private String password;
+
+    @NotBlank(message = "Name must not be blank")
+    private String name;
+
+    @Min(value = 18, message = "Age should not be less than 18")
+    private int age;
+
+    @NotBlank(message = "Phone must not be blank")
+    private String phone;
+
+    @Valid
+    @NotNull(message = "UserAddress must not be blank")
+    private UserAddress useraddress;
+
+    public UserAddress getUseraddress() {
+        return useraddress;
+    }
+
+    public void setUseraddress(UserAddress useraddress) {
+        this.useraddress = useraddress;
+    }
+
+    public UserAccount() {
+
+    }
+
+    public UserAccount(String email, String password, String name, int age) {
+        this.password = password;
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public String getPhone() {
+        return phone;
+    }
+
+    public void setPhone(String phone) {
+        this.phone = phone;
+    }
+
+}

spring-boot-modules/spring-boot-servicelayer-validation/src/main/java/com/baeldung/spring/servicevalidation/domain/UserAddress.java

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+package com.baeldung.spring.servicevalidation.domain;
+
+import javax.validation.constraints.NotBlank;
+public class UserAddress {
+    
+    @NotBlank
+    private String countryCode;
+    
+    public String getCountryCode() {
+        return countryCode;
+    }
+
+    public void setCountryCode(String countryCode) {
+        this.countryCode = countryCode;
+    }
+   
+}

spring-boot-modules/spring-boot-servicelayer-validation/src/main/java/com/baeldung/spring/servicevalidation/service/UserAccountService.java

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+package com.baeldung.spring.servicevalidation.service;
+
+import java.util.Set;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.ConstraintViolationException;
+import javax.validation.Validator;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.baeldung.spring.servicevalidation.dao.UserAccountDao;
+import com.baeldung.spring.servicevalidation.domain.UserAccount;
+
+@Service
+public class UserAccountService {
+
+	@Autowired
+	private Validator validator;
+	
+	@Autowired
+	private UserAccountDao dao;
+	
+	public String addUserAccount(UserAccount useraccount) {
+		
+		Set<ConstraintViolation<UserAccount>> violations = validator.validate(useraccount);
+
+		if (!violations.isEmpty()) {
+			StringBuilder sb = new StringBuilder();
+			for (ConstraintViolation<UserAccount> constraintViolation : violations) {
+				sb.append(constraintViolation.getMessage());
+			}
+
+			dao.addUserAccount(useraccount);
+			
+			throw new ConstraintViolationException("Error occurred: " + sb.toString(), violations);
+		}
+		
+		
+
+		return "Account for " + useraccount.getName() + " Added!";
+	}
+
+}