java.lang.ClassNotFoundException: org.apache.commons.collections.map.ListOrderedMap

错误声明：

java.lang.ClassNotFoundException: org.apache.commons.collections.map.ListOrderedMap
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1891)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1734)
	at net.sf.json.JSONObject.<init>(JSONObject.java:1450)
	at net.sf.json.util.CycleDetectionStrategy.<clinit>(CycleDetectionStrategy.java:37)
	at net.sf.json.JsonConfig.<clinit>(JsonConfig.java:65)
	at net.sf.json.JSONObject.fromObject(JSONObject.java:134)
	at org.hemin.course.utils.HttpUtil.httpRequest(HttpUtil.java:77)
	at org.hemin.course.utils.HttpUtil.getAccessToken(HttpUtil.java:100)
	at org.hemin.course.service.CoreService.processRequest(CoreService.java:75)
	at org.hemin.course.servlet.CoreServlet.doPost(CoreServlet.java:55)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)

错误原因：

json需要的6个包：

[c-sharp]  view plain  copy

1. commons-logging-1.0.4.jar  
2. commons-lang-2.3.jar  
3. commons-collections-3.2.jar  
4. commons-beanutils-1.7.0.jar  
5. json-lib-2.2.1-jdk15.jar  
6. ezmorph-1.0.4.jar  

 

另外如果commons-collections-3.2.jar没有或版本不对的话会出现

ListOrderedMap这个异常