autowired dao NullPointerException spring mvc + hibernate [duplicate] - spring

Question

This question already has answers here:
Why is my Spring #Autowired field null?
(21 answers)
Closed 7 years ago.
I'm trying to learn Spring MVC and Hibernate. When I try to run tests I have "Exception in thread "main" java.lang.NullPointerException".
public interface VacancyDAO
package pro.asfert.jobparser.dao;
public interface VacancyDAO {
void LoadDataBase(String query);
void FindVacancy(String queries);}
public class VacancyDAOImpl
package pro.asfert.jobparser.dao;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
#Repository
public class VacancyDAOImpl implements VacancyDAO {
#Autowired
private SessionFactory sessionFactory;
public void LoadDataBase(String query) {
sessionFactory.getCurrentSession().createQuery(query);
}
public void FindVacancy(String queries) {
if (queries.contains("По вашему запросу: ")) {
System.out.print(queries);
} else {
sessionFactory.getCurrentSession().createQuery(queries);
}
}
}
public interface VacancyService
package pro.asfert.jobparser.service;
public interface VacancyService {
void LoadDataBase();
void FindVacancy(String queries);
}
**public class VacancyServiceImpl**
package pro.asfert.jobparser.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import pro.asfert.jobparser.dao.VacancyDAO;
import pro.asfert.jobparser.domain.Parser;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
#Service
public class VacancyServiceImpl implements VacancyService {
#Autowired
private VacancyDAO VacancyDAO;
public static void main(String[] args) {
VacancyServiceImpl vacancyService = new VacancyServiceImpl();
vacancyService.FindVacancy("test");
}
/* deleted */
#Transactional
public void LoadDataBase() {
VacancyDAO.LoadDataBase(query);
}
#Transactional
public void FindVacancy(String queries) {
VacancyDAO.FindVacancy(sqlQuery);
}
application-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache.xsd ">
<context:annotation-config />
<context:property-placeholder location="classpath:jdbc.properties" system-properties-mode="ENVIRONMENT"/>
<context:component-scan base-package="pro.asfert.jobparser.dao"/>
<context:component-scan base-package="pro.asfert.jobparser.service"/>
<tx:annotation-driven transaction-manager="transactionManager"/>
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory">
</property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value = "${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.databaseurl}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<bean id = "sessionFactory" class = "org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref = "dataSource"/>
<property name="configLocation" value="classpath:hibernate.cfg.xml"/>
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.dialect">${jdbc.dialect}</prop>
<prop key="hibernate.connection.charSet">UTF-8</prop>
</props>
</property>
</bean>
</beans>
hibernate.cfg.xml
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<mapping class = "pro.asfert.jobparser.domain.Vacancy"></mapping>
</session-factory>
</hibernate-configuration>
Vacancy
package pro.asfert.jobparser.domain;
import javax.persistence.*;
#Entity
#Table(name = "Vacancies")
public class Vacancy {
public Vacancy() {
}
#Id
#Column(name = "id")
#GeneratedValue
private Integer id;
#Column (name = "vacancy")
private String vacancy;
#Column (name = "salary")
private String salary;
#Column (name = "experience")
private String experience;
#Column (name = "education")
private String education;
#Column (name = "employer")
private String employer;
#Column (name = "details")
private String details;
#Column (name = "hr")
private String hr;
#Column (name = "url")
private String url;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getVacancy() {
return vacancy;
}
public void setVacancy(String vacancy) {
this.vacancy = vacancy;
}
public String getSalary() {
return salary;
}
public void setSalary(String salary) {
this.salary = salary;
}
public String getExperience() {
return experience;
}
public void setExperience(String experience) {
this.experience = experience;
}
public String getEducation() {
return education;
}
public void setEducation(String education) {
this.education = education;
}
public String getEmployer() {
return employer;
}
public void setEmployer(String employer) {
this.employer = employer;
}
public String getDetails() {
return details;
}
public void setDetails(String details) {
this.details = details;
}
public String getHr() {
return hr;
}
public void setHr(String hr) {
this.hr = hr;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}

Answer 1

You're creating the service with new here:
public static void main(String[] args) {
VacancyServiceImpl vacancyService = new VacancyServiceImpl();
vacancyService.FindVacancy("test");
}
That way Spring is not involved and does not know anything about this object.
How to fix it:
register your dao and service as spring beans.
initialize the context and get the service from the context and call your method.
ApplicationContext ctx = new ClassPathXmlApplicationContext("application-context.xml");
VacancyServiceImpl serv = ctx.getBean(VacancyServiceImpl.class);
serv.FindVacancy("test");