各位大大帮忙解决java.lang.NoClassDefFoundError,急!急!急!

Question

 SRVE0026E: ［Servlet 错误］－［org/jfree/chart/labels/CategoryItemLabelGenerator］：java.lang.NoClassDefFoundError: org/jfree/chart/labels/CategoryItemLabelGenerator
at com.triman.fwxmgl.DjOperate.R_PAGE_CHART(DjOperate.java:217)
at com.triman.fwxmgl.DjOperate.doHandle(DjOperate.java:132)
at com.triman.fcl.web.Controller.doGet(Controller.java:128)
at com.triman.fcl.web.Controller.doPost(Controller.java:156)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:76)
at com.triman.servlet.MultipartFilter.doFilter(MultipartFilter.java:49)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:132)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:71)
at com.triman.psgis.login.ValidationFilter.doFilter(ValidationFilter.java:47)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:132)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:71)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:965)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:555)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:114)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:186)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:443)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:593)项目里可以找到这个类,classpath为.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;
为什么会找不到类啊

Answer 1

要么导错，要么jar包有问题。

Answer 2

public static void main(String[] args)
{
// TODO Auto-generated method stub
CreateChartServiceImpl pm = new CreateChartServiceImpl();
// 生成饼状图
pm.makePieChart();
// 生成单组柱状图
pm.makeBarChart();
// 生成多组柱状图
pm.makeBarGroupChart();
// 生成堆积柱状图
pm.makeStackedBarChart();
// 生成折线图
pm.makeLineAndShapeChart();
}运行结果正常啊

Answer 3

出现这个异常,通常是你的jar包有问题,重新导入就可以了.