Tomcat error: HTTP Status 500 (Wrapper cannot find servlet class solution

Tomcat error: HTTP Status 500-Wrapper cannot find servlet class

HTTP Status 500 - Wrapper cannot find servlet class com.servlet.servlet.RegServlet or a class it depends on

type Exception report

message Wrapper cannot find servlet class com.servlet.servlet.RegServlet or a class it depends on

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Wrapper cannot find servlet class com.servlet.servlet.RegServlet or a class it depends on
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
 org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
 java.lang.Thread.run(Unknown Source)
 

root cause

java.lang.ClassNotFoundException: com.servlet.servlet.RegServlet

org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
 org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
 org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
 java.lang.Thread.run(Unknown Source)

Solutions:

When you make sure that the servlet class is properly written and the configuration file is correct, the above problem still occurs:

Preparation: check whether the WEB-INF \classes file is properly generated. If not, proceed to step 1

Step 1: empty project -- > clean project

Step 2: clear tomcat cache -- > Directory file of corresponding project under directory \work\Catalina\localhost

Step 3: republish the project

Thank you for reading, I hope to help you, thank you for your support of this site!