(Java)intellij报错 Cannot resolve symbol 'request'
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我想用request.setAttrinute方法，结果标红报错，网上检查有没有导入servlet.api的方法也试过了还是没用，求大佬指点下怎么破
缺少servlet相关的依赖jar包。Servlet在java中被抽象为一个接口，它位于javax包中，需要引入servlet-api的jar包方可正常使用，目前最新版本为4.0。 参考技术A 你是用maven管理项目依赖的吗，在maven里面加入对应的依赖 参考技术B 大哥,你好歹贴个图看看啊
直觉上来说,你可能是缺少javax.servlet-api的包
Intellij IDEA 报错java.lang.NoClassDefFoundError
Intellij IDEA 报错java.lang.NoClassDefFoundError
11-Aug-2018 23:48:24.686 严重 [http-nio-8080-exec-5] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [com.wbg.testservlet] in context with path [] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: com.wbg.testDao
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1291)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
at com.wbg.testService.select(testService.java:9)
at com.wbg.testservlet.doGet(testservlet.java:19)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
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)
原因没有导入完整的jar包
解决方案:
方案一:
其实是因为jar包未被部署，那么在进行页面请求的时候，就会找不到jar包，那么就会报错…..
解决方案如下：
Projecture—>Artifacts–>选择打包部署项目—->Output Layout–>Web-INF—->查看下面是否有lib目录(如果没有lib目录，可自行创建)—>右边的jar包添加到lib目录下
以上，即可解决ClassNotFound的异常
方案二:
右键->F4进入，看到有报错，然后一直Add到没有就可以了，看图
成功解决
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