@Autowired is not working in restfull service with 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

Do you have the Implementation of ```BookService``` in your class path? — seenukarthi, Oct 16 '14 at 08:00
Have you annotated your `BookRestController` with the `@Controller` annotation? And is your implemantation of `BookService` annotated with `@Service` annotation? — Jens, Oct 16 '14 at 08:01
can you add @Produces along with GET eg:@Produces(MediaType.APPLICATION_JSON) — MrYo, Oct 16 '14 at 08:02
Can you view this question? http://stackoverflow.com/questions/26377710/remove-from-api-call-when-optional-parameter-is-null — MrYo, Oct 16 '14 at 08:05
@Karthikeyan yes i have made implementation of BookService and it is working fine when i am using in other spring controller — u12345, Oct 16 '14 at 08:18
In order for what you describing to work, you need to integration Spring with your JAX-RS implemenation (most-likely Jersey) — geoand, Oct 16 '14 at 08:19
@Jens yes i have added but its still giving the same nullpointerException on service — u12345, Oct 16 '14 at 08:21
@Sanjaya i have added @Produces(MediaType.APPLICATION_JSON) but still same prob — u12345, Oct 16 '14 at 08:22
You still need to follow the integration instructions for you specific versions. For example http://www.mkyong.com/webservices/jax-rs/jersey-spring-integration-example/ — geoand, Oct 16 '14 at 08:46
Please see this thread - http://stackoverflow.com/questions/19745187/spring-di-autowired-property-is-null-in-a-rest-service - which solves the problem. — Ashley Frieze, Oct 16 '14 at 10:39
Please see this thread - http://stackoverflow.com/questions/19745187/spring-di-autowired-property-is-null-in-a-rest-service - which solves the problem. — Ashley Frieze, Oct 16 '14 at 10:40

atish shimpi · Answer 1 · 2014-10-16T10:06:48.607

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.

edited Oct 16 '14 at 10:06

answered Oct 16 '14 at 10:00

atish shimpi

4,873
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i already did that its there in com.app.dao.hib package and i have added it in context:component-scan – u12345 Oct 16 '14 at 10:11
In your question @Controller not present in your BookRestController, can you provide your controller & service and service impl class. – atish shimpi Oct 16 '14 at 10:21
Actually the same code is working when i am not using jersey ie restFull service and rather just using it as a simple spring application so i dont think there can be problem in service service Impl class and i have added @Controller but it is still not working – u12345 Oct 16 '14 at 10:28

score 0 · Answer 2 · edited May 23 '17 at 12:20

0

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.

edited May 23 '17 at 12:20

Community

1
1

answered Oct 16 '14 at 10:41

Ashley Frieze

4,993
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@Autowired is not working in restfull service with spring

2 Answers2