Bean creation exception in spring mobile - spring

Question

I am getting the following exception while using sample
nested exception is
org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.mobile.device.Device]: Specified class is an interface] with root cause
My controller is as follows:
package com.srccodes.spring.controller;
import java.util.logging.Logger;
import org.springframework.mobile.device.Device;
import org.springframework.mobile.device.site.SitePreference;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* #author Abhijit Ghosh
* #version 1.0
*/
#Controller
public class SpringMobileHelloController {
private static final Logger logger = Logger.getLogger(SpringMobileHelloController.class.getName());
#RequestMapping("/")
public String sayHello(SitePreference sitePreference, Device device, Model model) {
logger.info("SitePreference : " + sitePreference);
logger.info("Device : " + device);
model.addAttribute("message", "Hello World!");
return "helloWorld";
}
}
My dispatcher-servlet.xml is:
(some parts omitted)
<context:component-scan base-package="com.srccodes.spring.controller" />
<mvc:annotation-driven>
<mvc:argument-resolvers>
<bean class="org.springframework.mobile.device.site.SitePreferenceWebArgumentResolver" />
<bean class="org.springframework.mobile.device.DeviceWebArgumentResolver" />
</mvc:argument-resolvers>
</mvc:annotation-driven>
<mvc:interceptors>
<!-- Resolve the device which has generated the request -->
<bean class="org.springframework.mobile.device.DeviceResolverHandlerInterceptor" />
<!-- User's site preference -->
<bean class="org.springframework.mobile.device.site.SitePreferenceHandlerInterceptor" />
<!-- Redirects users to the device specific site -->
<bean class="org.springframework.mobile.device.switcher.SiteSwitcherHandlerInterceptor" factory-method="urlPath">
<constructor-arg value="/m" />
<constructor-arg value="/t" />
<constructor-arg value="/SpringMobileHelloWorld" />
</bean>
</mvc:interceptors>
<!-- Device aware view resolving -->
<bean id="liteDeviceDelegatingViewResolver" class="org.springframework.mobile.device.view.LiteDeviceDelegatingViewResolver">
<constructor-arg>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/" />
<property name="suffix" value=".jsp" />
</bean>
</constructor-arg>
<property name="mobilePrefix" value="m/" />
<property name="tabletPrefix" value="t/" />
<property name="enableFallback" value="true" />
</bean>
</beans>
Please help me out as I am a beginner in spring mobile.This example is available in spring source official website.It is saying that device is a interface but I have used its implementing classes only.Basically I think its an error in dispatcher servlet.xml

Answer 1

Try to use Device filter:
<filter>
<filter-name>deviceResolverRequestFilter</filter-name>
<filter-class>org.springframework.mobile.device.DeviceResolverRequestFilter</filter-class>
</filter>
Anyway, you can retrieve the device from DeviceUtils, using an HttpServletRequest, like this handler example..:
public boolean preHandle(HttpServletRequest request, HttpServletResponse arg1, Object arg2) throws Exception {
Device device = DeviceUtils.getCurrentDevice(request);
...
}
I have the same problem and solve it with the second approach.

Answer 2

Check if <mvc:annotation-driven/> is not defined anywhere else.
Simply add:
<mvc:annotation-driven>
<mvc:argument-resolvers>
<bean class="org.springframework.mobile.device.DeviceWebArgumentResolver" />
<bean class="org.springframework.mobile.device.site.SitePreferenceWebArgumentResolver" />
</mvc:argument-resolvers>
</mvc:annotation-driven>

Answer 3

In addition to leogps answer, following is the Java Config
#Bean
public DeviceHandlerMethodArgumentResolver deviceHandlerMethodArgumentResolver() {
return new DeviceHandlerMethodArgumentResolver();
}
#Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
argumentResolvers.add(deviceHandlerMethodArgumentResolver());
}

Answer 4

You have to add argument resolver for this.
Follow this
If you'd like to pass the current Device as an argument to one of your #Controller methods, configure a DeviceWebArgumentResolver:
<annotation-driven>
<argument-resolvers>
<bean class="org.springframework.mobile.device.DeviceWebArgumentResolver" />
</argument-resolvers>
</annotation-driven>
You can alternatively configure a DeviceHandlerMethodArgumentResolver using Java-based configuration:
#Bean
public DeviceHandlerMethodArgumentResolver deviceHandlerMethodArgumentResolver() {
return new DeviceHandlerMethodArgumentResolver();
}
#Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
argumentResolvers.add(deviceHandlerMethodArgumentResolver());
}