I am new to spring and am creating a spring web application.
The application I'm writing has a Class PreLoadService. In this class is a method defined with @PostConstruct that calls a DAO to load the data. The DAO instance is declared in the class with the @autowired.
The Controller for the JSP then declares an instance of the PreLoadService and calls the getter to retrieve the data that should have been loaded in the @PostConstruct. The data is never loaded and an exception is also thrown on the @autowired.
Since this did not work I tried a simple Hello World version to write a message and received the same issue. I will post this. In the WEB_INF folder I have a web.xml and a spring3-servlet.xml. In the SRC folder I have an applicationContext.xml. I am running on Tomcat 7.
Web.xml
<?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>Spring3MVC</display-name>
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>root.webpath</param-value>
</context-param>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>spring3</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring3</servlet-name>
<url-pattern>*.html</url-pattern>
<url-pattern>/</url-pattern>
</servlet-mapping></web-app>
spring3-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: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-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!--will allow Spring to load all the components from package and all its child packages-->
<mvc:annotation-driven />
<context:component-scan
base-package="com.nikki.spring3.controller" />
<!-- will resolve the view and add prefix string /WEB-INF/jsp/ and suffix .jsp to the view in ModelAndView. -->
<bean id="viewResolver"
class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
applicationContext.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: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-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<mvc:annotation-driven/>
<context:component-scan base-package="com.nikki.spring3">
<context:exclude-filter expression="org.springframework.stereotype.Controller" type="annotation"/>
</context:component-scan>
<bean id="helloWorldService"
class="com.nikki.spring3.beansit.HelloWorldService">
<property name="message" value="Preloading Init Config and Data" />
HelloWorldService
public class HelloWorldService {
private String message;
public void setMessage(String message){
this.message = message;
}
public String getMessage(){
System.out.println("Your Message : " + message);
return message;
}
@PostConstruct
public void init(){
System.out.println("Bean is going through init.");
}
@PreDestroy
public void destroy(){
System.out.println("Bean will destroy now.");
}
}
HelloWorldController
@Controller
public class HelloWorldController {
@Autowired
HelloWorldService helloWorldService;
/* RequestMapping annotation tells Spring that this Controller should
* process all requests beginning with /hello in the URL path.
* That includes /hello/* and /hello.html.
*/
@RequestMapping("/hello")
public ModelAndView helloWorld() {
String message =helloWorldService.getMessage();
//"Hello World, Spring 3.0!";
return new ModelAndView("hello", "message", message);
}
}
Error Message
Exception
SEVERE: StandardWrapper.Throwable org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0':
Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'helloWorldController':
Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException:
Could not autowire field: com.nikki.spring3.beansit.HelloWorldService com.nikki.spring3.controller.HelloWorldController.helloWorldService;
nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException:
No matching bean of type [com.nikki.spring3.beansit.HelloWorldService] found for dependency:
expected at least 1 bean which qualifies as autowire candidate for this dependency.
Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)
I appreciate any help. Thanks.
