I am attempting to create rest web services to handle CRUD operations for an android application. I'm using Spring 4.0 with Hibernate. I'm trying to autowire a dao and it's always null and I haven't been able to figure out the cause of the issue. I searched online and everything looks right to me so I'm at a complete lost. I defined the bean in the applicationContext as I have saw in many tutorials but I'm unable to get the dao to autowire. Any help would be appreciated.
dispatch-servlet.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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<context:annotation-config />
<mvc:annotation-driven />
<context:component-scan base-package="com.bike.party.services, com.bike.party.daos" />
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
applicationContext.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" id="propertyConfigurer" p:location="/WEB-INF/jdbc.properties"/>
<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="dataSource" p:driverClassName="${jdbc.driverClassName}" p:password="${jdbc.password}" p:url="${jdbc.url}" p:username="${jdbc.username}"/>
<!-- ADD PERSISTENCE SUPPORT HERE (jpa, hibernate, etc) -->
<bean class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" id="sessionFactory">
<property name="dataSource" ref="dataSource"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
<property name="packagesToScan" value="com.bike.party.models"/>
</bean>
<bean class="org.springframework.orm.hibernate4.HibernateTransactionManager" id="transactionManager" p:sessionFactory-ref="sessionFactory" />
<tx:annotation-driven/>
</beans>
UserDao
package com.bike.party.daos;
import com.bike.party.models.User;
public interface UserDao extends Dao<User> {
public User findByUserName(String username);
}
UserDaoImpl
package com.bike.party.daos;
import com.bike.party.models.User;
import java.util.List;
import javax.transaction.Transactional;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Repository;
@Repository
@Transactional
@Qualifier("userDaoImpl")
public class UserDaoImpl implements UserDao {
@Autowired
private SessionFactory sessionFactory;
@Override
public User findByUserName(String username) {
List<User> userList = sessionFactory.getCurrentSession().createCriteria(User.class).add(Restrictions.eq("username", username)).setMaxResults(1).list();
return userList.isEmpty() ? null : userList.get(0);
}
}
UserWebService
package com.bike.party.services;
import com.bike.party.daos.UserDao;
import com.bike.party.models.User;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.ext.Provider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Provider
@Component
@Path("userservice")
public class UserWebService {
@Autowired
private UserDao userDao;
@GET
@Path("/user/{username}")
@Produces(MediaType.TEXT_PLAIN)
public String getUser(String username) {
if (userDao == null) {
return "the dao is null";
}
User user = userDao.findByUserName(username);
if (user == null) {
return "No user was found.";
} else {
return user.getUsername();
}
}
}
UPDATE:
I modified the UserWebService with
private UserDao userDao;
@Autowired
public void setUserDao(UserDao userDao) {
if (functionDao != null) {
System.out.println(String.valueOf(userDao.findByUserName("chris")));
} else {
System.out.println("setting the dao is null :(");
}
this.userDao= userDao;
}
When the web app is deployed this is called and finds the user but when I call it from the client it is always null. Could this be because I'm calling the service directly and not going through spring? If so could any point me to the create way to call the service from the client. Thanks
