#Autowired is not working in restfull service with spring - spring

Question

This is the mapping part:
#Path("/hello")
public class BookRestController {
#Autowired
BookService service;
#GET
public String getMsg() {
System.out.println("in controller");
List<BookDto> dto=service.loadAll();
System.out.println(dto);
return "dto";
}
}
web.xml code:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>springJdbc</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>jersey-serlvet</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>jersey-serlvet</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
servlet-dispatcher.xml code:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
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">
<!-- controller package detail -->
<context:component-scan base-package="com.app.controller,com.app.service,com.app.dao.hib" />
<!-- -->
<mvc:annotation-driven/>
<!-- -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:maxUploadSize="1500000"/>
<!-- -->
<mvc:resources mapping="/static/**" location="/static/" />
<!-- view resolver -->
<bean id="viewResolver1" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/jsps/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<!-- creating connection detail of hibernate (connection pooling) -->
<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/db1"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>
<!-- Hibernate mapping and configuration file details (Session factory details) -->
<bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="annotatedClasses">
<list>
<value>com.app.entity.BookEntity</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<!-- <prop key="hibernate.hbm2ddl.auto">create</prop> -->
</props>
</property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="mySessionFactory" />
</bean>
</beans>
It's giving null pointer exception on service or anything I am using as autowired i.e it's having problems autowiring. Can anyone help with this?I guess i am missing something which is used to implement restFull service coz the application is working fine with simple spring application

Answer 1

Interface :
public interface BookService {
}
Class which implements interface BookService:
#Service
public class BookServiceImpl implements BookService {
}
To autowire BookServiceImpl class, you have to put #Autowired annotation on interface name in BookRestController class and #Controller annotation on your controller class:
#Controller
public class BookRestController {
#Autowired
private BookService bookService;
}
also you have to take care of configuration, like for component scanning you have to add following line in your spring configuration file. Put
<context:component-scan base-package="com.org.dao"/>
in spring configuration xml and change com.org.dao to your package name where dao files placed in application.

Answer 2

This is answered in this thread - Spring DI - Autowired property is null in a REST service
Essentially Jersey doesn't automatically do Spring autowiring for you. You need to get the Spring stuff to happen with the Jersey servlet object.