Superclass has no null constructors but no arguments were given

Im using Spring Social in my application:

<spring.framework.version>3.2.0.RELEASE</spring.framework.version>
<hibernate.version>4.1.9.Final</hibernate.version>
<commons-dbcp.version>1.4</commons-dbcp.version>
<org.springframework.social-version>1.1.0.BUILD-SNAPSHOT</org.springframework.social-version>
<org.springframework.social.facebook-version>1.1.0.BUILD-SNAPSHOT</org.springframework.social.facebook-version>
<org.springframework-version>3.2.1.RELEASE</org.springframework-version>
<org.springframework.security.crypto-version>3.1.3.RELEASE</org.springframework.security.crypto-version>

When I apply

private final Facebook facebook;

@Inject

public SearchController(Facebook facebook) {

    this.facebook = facebook;

}

To my HomeController:

@Controller

public class HomeController {

    private final Facebook facebook;

    @Inject

    public HomeController(Facebook facebook) {

        this.facebook = facebook;

    }

    private static final Logger logger = LoggerFactory.getLogger(HomeController.class);

    /**

     * Simply selects the home view to render by returning its name.

    */

    @RequestMapping(value = "/", method = RequestMethod.GET)

    public String home(Model model) {

        return "home";

    }

}

The injection works like intented and I can get information from facebook. However, when I apply it to one of my other Cotrollers like this one

@Controller

@Transactional

@RequestMapping(value = "/search")

public class SearchController {

    private static final Logger logger = LoggerFactory.getLogger(SearchController.class);

    private final Facebook facebook;

    @Inject

    public SearchController(Facebook facebook) {

        this.facebook = facebook;

    }

    @PersistenceContext

    private EntityManager entityManager;

    ...

I getting this error:

mar 05, 2013 12:46:36 EM org.apache.catalina.core.StandardWrapperValve invoke

SEVERE: Servlet.service() for servlet [appServlet] in context with path [/project] threw exception [Request processing failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'searchController' defined in file [C:\Users\Nilsi\Downloads\springsource\vfabric-tc-server-developer-2.7.2.RELEASE\base-instance\wtpwebapps\course_info\WEB-INF\classes\com\courseinfo\project\controller\SearchController.class]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.courseinfo.project.controller.SearchController]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given] with root cause

java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given

at org.springframework.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:721)

at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)

at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)

at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)

at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)

at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)

at org.springframework.cglib.proxy.Enhancer.create(Enhancer.java:285)

at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205)

at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:111)

at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:477)

at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:362)

at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:322)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:412)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1492)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)

at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)

at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1117)

at org.springframework.web.method.HandlerMethod.createWithResolvedBean(HandlerMethod.java:202)

at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:233)

at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:55)

at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:297)

at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1091)

at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1076)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:896)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)

at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)

at java.lang.Thread.run(Thread.java:722)

My guess is that I can't inject facebook to a Controller with annotation @Transactional? I googled around but cant find any solution to this.

回答：

CGlib has one important restriction: the target class must provide a default constructor.

If you use property-based injection instead of constructor-based injection, the problem will go away.

翻译：

CGlib 有一个重要的限制：目标类必须提供一个默认的构造函数。

如果使用基于属性的注入而不是基于构造函数的注入，则问题将消失。