Java.lang.noclassdeffounderror:javax/servlet/servletinputstream

If you are in the process of development: Java.lang.noclassdeffounderror:javax/servlet/servletinputstream FileUpload. Fileupload.dopost (fileupload.java:36) javax.servlet.http.HttpServlet.service (httpservlet.java:717) Javax.servlet.http.HttpServlet.service (httpservlet.java:810) is similar to such a mistake, please see my answer. First, you have to check your classpath inside there is no configuration J2ee.jar second, you go to download a tomcat and then copy Tomcat_path/common/lib/servlet-api.jar and put it in your your_ In the Project/web-inf/lib, that's OK. Third, if you can not find the words, please put this servlet-api.jar, jdk_path/jre/lib/ext below, OK.