我在我的应用程序中使用Spring Social：
<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>
申请时
private final Facebook facebook;
@Inject
public SearchController(Facebook facebook) {
this.facebook = facebook;
}
到我的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";
}
}
注射效果与意图相似，我可以从facebook获取信息。但是，当我将它应用于我的其他一个Cotrollers时，就像这个
@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;
...
我收到此错误：
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)
我的猜测是我无法将注入@Transactional的注册表注入控制器？我用Google搜索，但无法找到解决方案。
答案 0 :(得分：58)
CGlib有一个重要的限制：目标类必须提供默认构造函数。
如果使用基于属性的注入而不是基于构造函数的注入，问题就会消失。
答案 1 :(得分：1)
我刚刚创建了一个空的默认构造函数来处理这个问题。
答案 2 :(得分：-1)
如果您在代码中使用Lombok，则只需添加以下注释即可消除此错误：
@NoArgsConstructor
public class SearchController {