Kotlin NoClassDefFoundError和spring @RequestMapping方法

我试图用Kotlin + IntelliJ来学习一些春天的基础知识，而且我遇到了一些麻烦。 @RequestMapping带注释的方法（带参数）会导致异常，而Java等价物完全正常。 Kotlin代码工作正常，但只有没有“processFormTwo”方法（将工作Java代码转换为kotlin也无济于事）。

这里是代码：

@Controller class HelloWorldController { @RequestMapping("/showForm") fun showForm() = "helloworld-form" // this one works fine @RequestMapping("/processForm") fun processForm() = "helloworld" //this one doesn't @RequestMapping("/processFormTwo") fun processFormTwo(request: HttpServletRequest, model: Model): String { var theName = request.getParameter("studentName") theName = theName.toUpperCase() val result = "Yo! " + theName model.addAttribute("message", result) return "helloworld" } } 

组态：

 <?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: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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- Step 3: Add support for component scanning --> <context:component-scan base-package="com.luv2code.springdemo" /> <!-- Step 4: Add support for conversion, formatting and validation support --> <mvc:annotation-driven/> <!-- Step 5: Define Spring MVC view resolver --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/view/" /> <property name="suffix" value=".jsp" /> </bean> </beans> 

web.xml中

 <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>spring-mvc-demo</display-name> <!-- Spring MVC Configs --> <!-- Step 1: Configure Spring MVC Dispatcher Servlet --> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring-mvc-demo-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- Step 2: Set up URL mapping for Spring MVC Dispatcher Servlet --> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app> 

错误日志：

例外

javax.servlet.ServletException：Servlet.init（）为servlet调度器抛出异常org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:504）org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java： 79）org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:620）org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:502）org.apache.coyote.http11.AbstractHttp11Processor.process（ AbstractHttp11Processor.java:1132）org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:684）org.apache.tomcat.util.net.AprEndpoint $ SocketProcessor.doRun（AprEndpoint.java:2521）org.apache。 tomcat.util.net.AprEndpoint $ SocketProcessor.run（AprEndpoint.java:2510）java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java： 617）org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThr ead.java:61）java.lang.Thread.run（Thread.java:745）根本原因

org.springframework.beans.factory.BeanCreationException：创建名为“helloWorldController”的bean时出错：无法为查找方法元数据内省bean类[com.luv2code.springdemo.mvc.HelloWorldController]：找不到依赖的类; 嵌套异常是java.lang.NoClassDefFoundError：科特林/ TypeCastException org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors（AutowiredAnnotationBeanPostProcessor.java:269）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors（AbstractAutowireCapableBeanFactory.java： 1118）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance（AbstractAutowireCapableBeanFactory.java:1091）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:513）org.springframework.beans.factory。 （AbstractAutowireCapableBeanFactory.java:483）org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306）org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleto （DefaultSingletonBeanRegistry.java:230）org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197）org。 springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:761）org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:867）org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext。 java：543）org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext（FrameworkServlet.java:668）org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext（FrameworkServlet.java:634）org.springframework.web.servlet.FrameworkServlet。 createWebApplicationContext（FrameworkServlet.java:682）org.springframework.web.servlet.FrameworkServlet.initWebAppli （ContextServlet.java:553）org.springframework.web.servlet.FrameworkServlet.initServletBean（FrameworkServlet.java:494）org.springframework.web.servlet.HttpServletBean.init（HttpServletBean.java:171）javax.servlet.GenericServlet。 init（GenericServlet.java:158）org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:504）org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:79）org.apache.catalina。 （AbstractAccessLogValve.java:620）org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:502）org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1132）org。 apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:684）org.apache.tomcat.util.net.AprEndpoint $ SocketProcessor.doRun（AprEndpoint.java:2521）org.apache.tomcat.util.net.AprEndpoint $ SocketProcessor.run（AprEndpoint.java:2510）java.util.concurrent.ThreadPoolExecutor.runWo rker（ThreadPoolExecutor.java:1142）java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617）org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）java。 lang.Thread.run（Thread.java:745）的根本原因

java.lang.NoClassDefFoundError：java.lang.Class.getDeclaredMethodsO（Native Method） springframework.util.ReflectionUtils.getDeclaredMethods（ReflectionUtils.java:613）org.springframework.util.ReflectionUtils.doWithMethods（ReflectionUtils.java:524）org.springframework.util.ReflectionUtils.doWithMethods（ReflectionUtils.java:510）org.springframework。 beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors（AutowiredAnnotationBeanPostProcessor.java:247）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors（AbstractAutowireCapableBeanFactory.java:1118）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance（ AbstractAutowireCapableBeanFactory.java:1091）org.springframework.beans.factory.support.AbstractAutowireCapabl eBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:513）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:483）org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306 ）org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）org.springframework.beans.factory.support .AbstractBeanFactory.getBean（AbstractBeanFactory.java:197）org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:761）org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:867）org.springframework.beans.factory.support .springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:5 43）org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext（FrameworkServlet.java:668）org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext（FrameworkServlet.java:634）org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext（ FrameworkServlet.java:682）org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext（FrameworkServlet.java:553）org.springframework.web.servlet.FrameworkServlet.initServletBean（FrameworkServlet.java:494）org.springframework.web.servlet。 HttpServletBean.init（HttpServletBean.java:171）javax.servlet.GenericServlet.init（GenericServlet.java:158）org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:504）org.apache.catalina.valves。 ErrorReportValve.invoke（ErrorReportValve.java:79）org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:620）org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:502）org.apach e.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1132）org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:684）org.apache.tomcat.util.net.AprEndpoint $ SocketProcessor.doRun（ AprEndpoint.java:2521）org.apache.tomcat.util.net.AprEndpoint $ SocketProcessor.run（AprEndpoint.java:2510）java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）java.util.concurrent。 ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617）org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）java.lang.Thread.run（Thread.java:745）根本原因

java.lang.ClassNotFoundException：kotlin.TypeCastException org.apache.catalina.loader.WebappClassLoaderBase.loadClass（WebappClassLoaderBase.java:1333）org.apache.catalina.loader.WebappClassLoaderBase.loadClass（WebappClassLoaderBase.java:1167）java.lang.Class .getDeclaredMethods0（Native Method）java.lang.Class.privateGetDeclaredMethods（Class.java:2701）java.lang.Class.getDeclaredMethods（Class.java:1975）org.springframework.util.ReflectionUtils.getDeclaredMethods（ReflectionUtils.java:613） org.springframework.util.ReflectionUtils.doWithMethods（ReflectionUtils.java:524）org.springframework.util.ReflectionUtils.doWithMethods（ReflectionUtils.java:510）org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors（AutowiredAnnotationBeanPostProcessor.java： 247）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessor（AbstractAutowireCapableBeanFactory.java:1118）org.springframework。 （AbstractAutowireCapableBeanFactory.java:513）org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:1091）org.springframework.beans.factory.support AbstractAutowireCapableBeanFactory.java:483）org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306）org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）org.springframework .beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197）org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons （DefaultListableBeanFactory.java:761）org.springframework.context.support.AbstractApplic ationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:867）org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:543）org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext（FrameworkServlet.java:668）org.springframework。 web.servlet.FrameworkServlet.createWebApplicationContext（FrameworkServlet.java:634）org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext（FrameworkServlet.java:682）org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext（FrameworkServlet.java:553） org.springframework.web.servlet.FrameworkServlet.initServletBean（FrameworkServlet.java:494）org.springframework.web.servlet.HttpServletBean.init（HttpServletBean.java:171）javax.servlet.GenericServlet.init（GenericServlet.java:158） org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:504）org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValv e.java:79）org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:620）org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:502）org.apache.coyote.http11。 AbstractHttp11Processor.process（AbstractHttp11Processor.java:1132）org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:684）org.apache.tomcat.util.net.AprEndpoint $ SocketProcessor.doRun（AprEndpoint.java:2521） org.apache.tomcat.util.net.AprEndpoint $ SocketProcessor.run（AprEndpoint.java:2510）java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）java.util.concurrent.ThreadPoolExecutor $ Worker.run（ ThreadPoolExecutor.java:617）org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）java.lang.Thread.run（Thread.java:745）

Answer 1

尝试将Controller类和函数都标记为open

有一个gradle插件可以将所有的类标记为open：

 buildscript{ dependencies { classpath("org.jetbrains.kotlin:kotlin-allopen:$kotlinVersion") } } apply plugin: 'kotlin-spring'