web-dev-qa-db-ja.com

スーパークラスにはnullコンストラクタはありませんが、引数が指定されていません

私のアプリケーションでSpring Socialを使用しています：

<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>

応募するとき

private final Facebook facebook;

@Inject
public SearchController(Facebook facebook) {
    this.facebook = facebook;
}

私のHomeControllerに：

@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";
    }

}

インジェクションは意図したように機能し、facebookから情報を取得できます。ただし、このような他のCotrollerの1つに適用すると、

@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;

    ...

私はこのエラーを受け取ります：

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)

私の推測では、@ Transactionalアノテーションが付いたコントローラーにFacebookを注入できないと思いますか？私はググってみましたが、これに対する解決策を見つけることができません。

facebookspringhibernateinjectspring-social
32
nilsi

CGlibには1つの重要な制限があります。ターゲットクラスはデフォルトのコンストラクターを提供する必要があります。

コンストラクターベースのインジェクションの代わりにプロパティベースのインジェクションを使用する場合、問題はなくなります。

58
Maksym Demidas

これを処理するために空のデフォルトコンストラクタを作成しました。

1
Smart Coder