java.lang.NoClassDefFoundError:IllegalName: firstDemo/Test
java.lang.ClassLoader.preDefineClass(Unknown Source)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2277)
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:811)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1254)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.util.concurrent.ThreadPoolExecutor.runWorker(UnknownSource)
java.util.concurrent.ThreadPoolExecutor$Worker.run(UnknownSource)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Unknown Source)
截图：
控制台报错：
Exception Processing /test/hello
java.lang.NoClassDefFoundError: IllegalName: firstDemo/Test
atjava.lang.ClassLoader.preDefineClass(Unknown Source)
atjava.lang.ClassLoader.defineClass(Unknown Source)
atjava.security.SecureClassLoader.defineClass(Unknown Source)
atorg.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2277)
atorg.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:811)
atorg.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1254)
atorg.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
atorg.apache.catalina.core.StandardWrapper.servletSecurityAnnotationScan(StandardWrapper.java:1128)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
atorg.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
atorg.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
atorg.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
atorg.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
atorg.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
atjava.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
atjava.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)
截图如下：
看了好久，发现是在web.xml中配置错了，复制程序的完整路径直接粘贴过来，去掉开头的src什么的，最后是这样的<servlet-class>firstDemo/Test</servlet-class>
然而这里应该写包名.类名。疏忽大意了
重新配置一下后正确。