在我的DAO中自动装配的sessionFactory Bean始终显示为null。下面是我的项目。
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.core.io.ClassPathResource;
@Configuration
@Import({HibernateConfig.class})
public class AppConfig {
@Bean
public PropertyPlaceholderConfigurer propertyPlaceHolderConfigurer(){
PropertyPlaceholderConfigurer prop = new PropertyPlaceholderConfigurer();
prop.setLocation(new ClassPathResource("dbProperties.properties"));
prop.setIgnoreUnresolvablePlaceholders(true);
return prop;
}
}
import java.util.Properties;
import javax.sql.DataSource;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate4.HibernateTransactionManager;
import org.springframework.orm.hibernate4.LocalSessionFactoryBuilder;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import com.model.Person;
@Configuration
//@EnableTransactionManagement
//@PropertySource(value={"classpath:dbProperties.properties"})
public class HibernateConfig {
@Value("${driverClassName}")
private String driverClassName;
@Value("${url}")
private String url;
@Value("${username}")
private String username;
@Value("${password}")
private String password;
@Value("${hibernate.dialect}")
private String hibernateDielect;
@Value("${hibernate.show_sql}")
private String hibernateShowSQL;
@Value("${hibernate.hbm2ddl.auto}")
private String hibernateHbm2Ddlauto;
@Bean
public DataSource datasource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(driverClassName);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
return dataSource;
}
public Properties hibernateProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", hibernateDielect);
properties.put("hibernate.show_sql", hibernateShowSQL);
properties.put("hibernate.hbm2ddl.auto", hibernateHbm2Ddlauto);
return properties;
}
@Bean
@Autowired
public SessionFactory sessionFactory(DataSource dataSource) {
LocalSessionFactoryBuilder sessionBuilder = new LocalSessionFactoryBuilder(dataSource);
sessionBuilder.scanPackages("com.configuration");
sessionBuilder.addAnnotatedClass(Person.class);
sessionBuilder.addProperties(hibernateProperties());
return sessionBuilder.buildSessionFactory();
}
@Bean
@Autowired
public HibernateTransactionManager transactionManager(SessionFactory sessionFactory) {
HibernateTransactionManager transactionManager = new HibernateTransactionManager();
transactionManager.setSessionFactory(sessionFactory);
return transactionManager;
}
}
import java.util.List;
import com.model.Person;
public interface PersonDao {
void savePerson(Person persom);
void deletePerson(String taxid);
List<Person> getAllPersons();
Person updatePerson(Person person);
Person findPersonById(String taxid);
}
import java.util.List;
import javax.transaction.Transactional;
import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.model.Person;
@Service
public class PersonDaoImpl implements PersonDao {
@Autowired
SessionFactory sessionFactory;
@Override
@Transactional
public void savePerson(Person person) {
sessionFactory.getCurrentSession().persist(person);
}
@Override
@Transactional
public void deletePerson(String taxid) {
// TODO Auto-generated method stub
// Criteria criteria = getSession().createCriteria(Person.class);
Query query = sessionFactory.getCurrentSession().createSQLQuery("DELETE FROM PERSON WHERE taxid = :taxid");
query.setString(taxid, "taxid");
}
@SuppressWarnings("unchecked")
@Override
@Transactional
public List<Person> getAllPersons() {
// TODO Auto-generated method stub
Criteria criteria = sessionFactory.getCurrentSession().createCriteria(Person.class);
return (List<Person>) criteria.list();
}
@Override
@Transactional
public Person updatePerson(Person person) {
// TODO Auto-generated method stub
sessionFactory.getCurrentSession().update(person);
return person;
}
@Override
@Transactional
public Person findPersonById(String taxid) {
// TODO Auto-generated method stub
Criteria criteria = sessionFactory.getCurrentSession().createCriteria(Person.class);
criteria.add(Restrictions.eq("taxid", taxid));
return (Person) criteria.uniqueResult();
}
}
import java.sql.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name ="person")
public class Person {
@Column(name ="FIRSTNAME")
private String firstName;
@Column(name ="LASTNAME")
private String lastName;
@Column(name ="DOB")
private Date DOB;
@Column(name ="TAXID")
@Id
private String taxid;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Date getDOB() {
return DOB;
}
public void setDOB(Date dOB) {
DOB = dOB;
}
public String getTaxid() {
return taxid;
}
public void setTaxid(String taxid) {
this.taxid = taxid;
}
@Override
public String toString() {
return "Person [firstName=" + firstName + ", lastName=" + lastName + ", DOB=" + DOB + ", taxid=" + taxid + "]";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((DOB == null) ? 0 : DOB.hashCode());
result = prime * result + ((firstName == null) ? 0 : firstName.hashCode());
result = prime * result + ((lastName == null) ? 0 : lastName.hashCode());
result = prime * result + ((taxid == null) ? 0 : taxid.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Person other = (Person) obj;
if (DOB == null) {
if (other.DOB != null)
return false;
} else if (!DOB.equals(other.DOB))
return false;
if (firstName == null) {
if (other.firstName != null)
return false;
} else if (!firstName.equals(other.firstName))
return false;
if (lastName == null) {
if (other.lastName != null)
return false;
} else if (!lastName.equals(other.lastName))
return false;
if (taxid == null) {
if (other.taxid != null)
return false;
} else if (!taxid.equals(other.taxid))
return false;
return true;
}
}
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import com.configuration.AppConfig;
import com.dao.PersonDaoImpl;
import com.model.Person;
public class AppMain {
public static void main(String args[]) {
AbstractApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
Person person = new Person();
person.setFirstName("Akhil");
person.setLastName("goli");
person.setTaxid("123abc456");
PersonDaoImpl impl = new PersonDaoImpl();
impl.savePerson(person);
}
}
线程“main”中的异常java.lang.NullPointerException at com.dao.PersonDaoImpl.savePerson（PersonDaoImpl.java:25）at main.AppMain.main（AppMain.java:20）
答案 0 :(得分：1)
您必须调用afterPropertiesSet()来初始化bean。现在你只创建了bean但没有初始化。
答案 1 :(得分：0)
我明白了。当我使用Hibernate4时，我需要使用
StandardServiceRegistryBuilder类获取SessionFactory。
希望这段代码有所帮助。
public class HibernateUtil {
public SessionFactory getSessionFactory()
{
Configuration config = new Configuration().configure();
StandardServiceRegistryBuilder serviceRegistryBuilder = new StandardServiceRegistryBuilder().applySettings(config.getProperties());
SessionFactory session = config.buildSessionFactory(serviceRegistryBuilder.build());
return session;
}
答案 2 :(得分：0)
我将sessionFactory配置代码放在这里。希望对您有帮助。
@Bean
// @Autowired
// @Bean(name = "sessionFactory")
public SessionFactory sessionFactory() throws IOException {
Properties hibernateProperties = new Properties();
hibernateProperties.put("hibernate.dialect", HIBERNATE_DIALECT);
hibernateProperties.put("hibernate.show_sql", HIBERNATE_SHOW_SQL);
hibernateProperties.put("hibernate.hbm2ddl.auto", HIBERNATE_HBM2DDL_AUTO);
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(dataSource());
sessionFactory.setPackagesToScan(ENTITYMANAGER_PACKAGES_TO_SCAN);
sessionFactory.setHibernateProperties(hibernateProperties);
sessionFactory.afterPropertiesSet(); // Used in Spring-boot 2.x for initializing the bean
SessionFactory sf = sessionFactory.getObject();
System.out.println("## getSessionFactory: " + sf);
return sf;
}