Tomcat 404 when using class

Question

I have a Tomcat server running with index.jsp but when I add the .class servlet it turns the index.jsp into Not found 404.

This is my web.xml in /opt/tomcat9/webapps/ROOT/WEB-INF

// Servlets
<servlet>
    <servlet-name>login</servlet-name>
    <servlet-class>com.tyd.gr1.la.login</servlet-class>
</servlet>

// Servlet Mappings
<servlet-mapping>
    <servlet-name>login</servlet-name>
    <url-pattern>/login</url-pattern>
</servlet-mapping>

My index.jsp is located in /opt/tomcat9/webapps/ROOT

If I remove the login.class in /opt/tomcat9/webapps/ROOT/WEB-INF/classes/com/tyd/gr1/la and start tomcat I get presented with the index.jsp

But if I put login.class back I get HTTP Status 404 – Not Found Type Status Report

Message Not found

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Screenshot1

I found the "Tomcat is properly configured" index.html there so I replaced it with my own index.jsp. It shows but when I add a java .class suddenly I get 404 — wingchun1274, Nov 27 '18 at 00:34
@wingchun1274 please post a proper screen shot of your directory structure and also what url you are entering — Ramanlfc, Nov 27 '18 at 00:37
@wingchun1274 what method have you mapped inside your login.java class to handle '/' path ? — AppleCiderGuy, Nov 27 '18 at 00:45
@Harshal On my Windows PC I made a .java that uses the data from a form in the index.jsp to check against a database. In IntelliJ IDE the .java works with the index.jsp. I used javac and the neccesary libraries on my pi to compile the .java into .class so I can put it in Tomcat. — wingchun1274, Nov 27 '18 at 00:49
@Ramanlfc After I moved `WEB-INF` under `webapps`. Tomcat doesn't make a link to the `login.class` anymore. In my `index.jsp` it is `
`. Now after I press submit it gives an `error 404 for /login` — wingchun1274, Nov 27 '18 at 00:59

SlinnShady · Answer 1 · 2020-10-16T15:04:28.823

I have just been fighting this. Some things that helped me:

check your web.xml has correct spelling of tags such as <servlet>
check your naming in <servlet-class></servlet-class>

i.e. <servlet-class>com.tyd.gr1.la.login</servlet-class>
build as a war and let Tomcat deploy. It will likely use: webapps/WEB-INF/classes/com/tyd/gr1/la note the ROOT is dropped
note case sensitivity. For me in one example

<form action=\"HelloWorld\" method=\"POST\">\r\n") - BROKE giving a 404

<form action=\"helloworld\" method=\"POST\">\r\n") - worked
If you are still struggling start to comment out your xml.web declarations to isolate what is breaking. I found I could reach assets and HTML pages, JSPs and other elements until I finally fixed the class naming and it all worked.

This was a long time ago, I think I avoided this by deploying it via a .war file instead of manually putting it in directories. — wingchun1274, Oct 17 '20 at 15:03

Tomcat 404 when using class

1 Answers1