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我正在尝试在 Java Web 中使用 JSON。通过调用 JSONArray.fromObject() 将 List 转换为 JSONArray，我确定我的论点是正确的，但抛出了如下异常：

java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2733)
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1124)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1612)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at org.vclub.model.json.Page2Json.getJsonFromList(Page2Json.java:10)
    at org.vclub.controller.TopicController.loadMoreTopic(TopicController.java:70)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:185)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:100)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:502)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:465)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:863)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:792)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:851)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:767)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Thread.java:619)

顺便说一句，从谷歌的答案中学习，我添加了所需的库。

commons-beanutils-1.8.3.jar
commons-collections-3.2.1.jar
commons-lang3-3.1.jar
commons-logging-1.1.2.jar
ezmorph-1.0.6-sources.jar

它仍然不起作用。请帮我。提前致谢

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2 回答 2

3

查看：

http://json-lib.sourceforge.net/

你需要commons-lang 2.5在你的类路径中。目前你有commons-lang3-3.1.jar哪个没有org.apache.commons.lang.包但有 org.apache.commons.lang3..

在您的类路径中添加commons-lang 2.5或2.6，这将起作用。

于 2013-04-09T11:17:45.040 回答
0

我想你的问题在这里：commons-lang3-3.1.jar。您已经添加了 commons lang 版本 3。请查看commons lang 的主页：

请注意，Lang 3.0（和后续版本）使用与以前版本（org.apache.commons.lang）不同的包（org.apache.commons.lang3）

这意味着您可能应该使用 commons lang 版本 2。

于 2013-04-09T11:18:52.833 回答