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java servlet验证码显示不出来

报错信息

严重: Allocate exception for servlet [ImageServlet]
java.lang.ClassNotFoundException: com.eravik.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.eravik.com/learn/283
2-2节的内容

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类中不到,检查相应的类是否放到了WEB-INF/classes目录下了
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