java servlet验证码显示不出来

Question

报错信息

严重: Allocate exception for servlet [ImageServlet]

java.lang.ClassNotFoundException: com.imooc.ImageServlet

at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1291)

at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)

at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:544)

at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:525)

at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)

at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1044)

at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:773)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:133)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:745)

用老师的代码跑了一遍包同样的错误

课程地址https://www.imooc.com/learn/283

2-2节的内容

Answer 1

类中不到，检查相应的类是否放到了WEB-INF/classes目录下了