為什么用eclipse EE會(huì)出現(xiàn)空指針異常
org.apache.catalina.core.StandardWrapperValve invoke
嚴(yán)重: Servlet.service() for servlet [search] in context with path [/studyajax] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
?? ?at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
?? ?at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
?? ?at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
?? ?at java.lang.ClassLoader.defineClass1(Native Method)
?? ?at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
?? ?at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
?? ?at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:3205)
?? ?at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:1373)
?? ?at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1861)
?? ?at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
?? ?at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
?? ?at com.zkp.SearchServlet.doGet(SearchServlet.java:40)
?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
?? ?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
?? ?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
?? ?at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
?? ?at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
?? ?at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
?? ?at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
?? ?at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
?? ?at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
?? ?at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
?? ?at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
?? ?at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
?? ?at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
?? ?at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2549)
?? ?at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2538)
?? ?at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
?? ?at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
?? ?at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
?? ?at java.lang.Thread.run(Thread.java:619)
2018-06-13
不會(huì)空指針異常了
2018-06-13
搞定了,是里面的瀏覽器不能請求數(shù)據(jù),用外面的瀏覽器就可以有數(shù)據(jù)了。
2018-06-13
web.xml配置出了問題吧