In this post, we will see @Digits Javax Validation Hibernate Spring Boot Example Using Oracle Database. We will see how to use @Digits annotation with the BigDecimal type filed, also we will define an error handler for the validation error message.
- @Digits annotation has been defined in javax.validation.constraints package and the field where we are going to use this annotation must be a number.
- We need to use mandatory attributes integer and fraction with @Digits. For example @Digits(integer = 5, fraction = 2).
- This annotation support following types – BigDecimal, BigInteger, CharSequence, int, long, byte, short, Integer, Long, Byte and Short.
Student.java
@Entity
public class Student {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@Column(name = "student_name")
private String studentName;
@Column(name = "fee")
@Digits(integer = 4, fraction = 2)
private BigDecimal fee;
}
Valid Request Data –
Invalid request data –
@Digits Javax Validation Hibernate Spring Boot Example from scratch.
After running below example, we will be able to save an entity in the database if we have valid request data else it will show the validation error message.
Open eclipse and create maven project, Don’t forget to check ‘Create a simple project (skip)’ click on next. Fill all details as below and click on finish.
Modify pom.xml
<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>hibernatevalidatorexample</groupId>
<artifactId>hibernatevalidatorexample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>hibernatevalidatorexample</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3</version>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<fork>true</fork>
<executable>C:\Program Files\Java\jdk1.8.0_131\bin\javac.exe</executable>
</configuration>
</plugin>
</plugins>
</build>
</project>
Note – In pom.xml we have defined javac.exe path in configuration tag. You need to change accordingly i.e where you have installed JDK.
If you see any error for oracle dependency then follow these steps.
Directory structure –
Student.java
package com.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.validation.constraints.Digits;
@Entity
public class Student {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@Column(name = "student_name")
private String studentName;
@Column(name = "fee")
@Digits(integer = 4, fraction = 2)
private BigDecimal fee;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
public BigDecimal getFee() {
return fee;
}
public void setFee(BigDecimal fee) {
this.fee = fee;
}
}
StudentController.java
package com.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.entity.Student;
import com.service.StudentService;
@RestController
@RequestMapping(value = "/student")
public class StudentController {
@Autowired
private StudentService studentService;
@RequestMapping(value = "/save", method = RequestMethod.POST)
@ResponseBody
public Student saveBook(@RequestBody Student student) {
Student studentResponse = (Student) studentService.saveStudent(student);
return studentResponse;
}
}
StudentRepository.java – interface
package com.repository;
import java.io.Serializable;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.entity.Student;
@Repository
public interface StudentRepository extends CrudRepository<Student,Serializable> {
}
StudentService.java – interface
package com.service;
import org.springframework.stereotype.Component;
import com.entity.Student;
@Component
public interface StudentService {
public Student saveStudent(Student student);
}
StudentServiceImpl.java
package com.impl;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.Validation;
import javax.validation.Validator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.entity.Student;
import com.repository.StudentRepository;
import com.service.StudentService;
@Service("studentServiceImpl")
public class StudentServiceImpl implements StudentService {
@Autowired
private StudentRepository studentRepository;
@Override
public Student saveStudent(Student student) {
validateEntity(student);
Student studentresponse = studentRepository.save(student);
return studentresponse;
}
private void validateEntity(Student student) {
List<String> errorMessage = new ArrayList<>();
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
Set<ConstraintViolation<Student>> constraintViolations = validator.validate(student);
for (ConstraintViolation<Student> constraintViolation : constraintViolations) {
errorMessage.add(constraintViolation.getMessage());
}
if (errorMessage.size() > 0) {
throw new ConstraintViolationException(constraintViolations);
}
}
}
GlobalErrorHandler.java – Let’s define a error handler class. This class will be used when validateEntity() method will throw ConstraintViolationException(See more details about GlobalErrorHandler here).
package com.controller;
import java.util.List;
import java.util.ArrayList;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import com.entity.ResponseError;
@ControllerAdvice
public class GlobalErrorHandler {
@ExceptionHandler(ConstraintViolationException.class)
@ResponseBody
public ResponseError handleCustomException(ConstraintViolationException ex) {
ResponseError responseError = new ResponseError();
List<String> errorMessages = new ArrayList();
for (ConstraintViolation constraintViolation : ex.getConstraintViolations()) {
errorMessages.add(constraintViolation.getPropertyPath() + " : " + constraintViolation.getMessage());
}
responseError.setErrorMessage(errorMessages);
responseError.setStatusCode(HttpStatus.BAD_REQUEST.value());
return responseError;
}
}
ResponseError.java
package com.entity;
import java.util.List;
public class ResponseError {
private List<String> errorMessage;
private int statusCode;
public List<String> getErrorMessage() {
return errorMessage;
}
public void setErrorMessage(List<String> errorMessage) {
this.errorMessage = errorMessage;
}
public int getStatusCode() {
return statusCode;
}
public void setStatusCode(int statusCode) {
this.statusCode = statusCode;
}
}
SpringMain.java
package com.main;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan(basePackages = "com.*")
@EntityScan("com.entity")
public class SpringMain {
public static void main(String[] args) {
SpringApplication.run(SpringMain.class, args);
}
}
JpaConfig.java
package com.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
@Configuration
@EnableJpaRepositories(basePackages = "com.repository")
public class JpaConfig {
}
application.properties
# Connection url for the database spring.datasource.url=jdbc:oracle:thin:@localhost:1521:XE spring.datasource.username=SYSTEM spring.datasource.password=oracle2 spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver # Show or not log for each sql query spring.jpa.show-sql = true spring.jpa.hibernate.ddl-auto =create spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.Oracle10gDialect server.port = 9091
Let’s run the SpringMain class(run as java application).
Valid request
{
"studentName":"rakesh",
"fee":1244
}
response
{
"id": 3,
"studentName": "rakesh",
"fee": 1244
}
----------------------------
Invalid Request
{
"studentName":"rakesh",
"fee":12445.8999
}
Response
{
"errorMessage": [
"fee : numeric value out of bounds (<4 digits>.<2 digits> expected)"
],
"statusCode": 400
}
That’s all about @Digits Javax Validation Hibernate Spring Boot Example.
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- One To One Mapping Annotation Example in Hibernate/JPA using Spring Boot and Oracle.
- One To One Bidirectional Mapping Example In Hibernate/JPA Using Spring Boot and Oracle.
- One To Many Mapping Annotation Example In Hibernate/JPA Using Spring Boot And Oracle.
- Many To One Unidirectional Mapping In Hibernate/JPA Annotation Example Using Spring Boot and Oracle.
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- Many To Many Mapping Annotation Example In Hibernate/JPA Using Spring Boot And Oracle.
- Spring Data CrudRepository save() Method.
See Docs.
