I get 404 while deploying Tomcat and calling localhost://8080

and moreover:

when I try to deploy this app on a running TomCat-instance with tomcat7 plugin the app is deployed and is seen in the list of running app (on tomcat-app-manager-page). But the app still behaves in the same way - with the same 404-error message and the same description.

I tried to recode this tiny app with jersey2 (org.glassfish.jersey), but it didn't change anything.

Seems Manifest is missing. Could you please try to create new project using your git link, add mentioned changes and run it once again.

Ok, I did so. Made a new branch: https://github.com/Sergei-Gots/simple-JAX-RX-implementation/tree/jersey-2_org.glassfish.jersey

cloned it  making a new project. 

as I could imagine (it seems that is wrong) that there is no manifest is needed  at all:

if I try to add a MANIFEST-file I've been asked about a project's main class and class path in my app. But a main class should contain a main()-methond which is not intended to be within servlet-project. E.g. I I have now such a code in the only java class:

import javax.ws.rs.GET;
import javax.ws.rs.Path;

@Path("/hello")
public class HelloService {
    @GET
    public String getMsg() {
        return "Hello World !! - Jersey 2";
    }
}

I think there is some fundamental misunderstanding. But can't  get what is wrong and how should the MANIFEST.mf look like in the absence of the main-method(). To my sad, I haven't found any mention everywhere about MANIFEST.mf in tutorials and examples. There are only pom.xml and web.xml mentioned. 

In addition, I tried to create a new Project "Java-Enterprise"  with a template "REST-service JAX-RS resource". Unfortunately, with the same result.

What I know about MANIFEST.mf: it will be created usually in target/<applicationName>/META-INF/, so it will be generated however throughout the maven build.

It works in such way for my java-JSP projects. As I can see now it looks very abstract. E.g.:

Manifest-Version: 1.0
Created-By: IntelliJ IDEA
Built-By: serj
Build-Jdk: Oracle OpenJDK version 18.0.1

I checked your branch. It works fine on my side with default Tomcat run configuration. I just started it and then opened "http://localhost:8080/simple_JAX_RX_war_exploded/rest/hello"

Ok, thank you for that.

But what  I could do wrong if I still get 404-erorr upon "http://localhost:8080/simple_JAX_RX_war_exploded/rest/hello"

(It's obviously the misspelled  by me  "simple_JAX_RS"... but ok::)))

App is deployed as it output from Server Log. and I have this simple_JAX_RX_war_exploded artifact seems to be deployed.

and to my happy  http://localhost:8080/manager/html

there is a corresponding row in the application list:

P.S last rows of log in IntelliJ are:

Connected to server
[2022-06-07 10:59:56,789] Artifact simple-JAX-RX-implementation:war exploded: Artifact is being deployed, please wait...
07-Jun-2022 22:59:58.923 INFO [RMI TCP Connection(2)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
[2022-06-07 10:59:59,155] Artifact simple-JAX-RX-implementation:war exploded: Artifact is deployed successfully
[2022-06-07 10:59:59,156] Artifact simple-JAX-RX-implementation:war exploded: Deploy took 2,366 milliseconds
07-Jun-2022 23:00:06.302 INFO [Catalina-utility-2] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/apache-tomcat-10.0.21/webapps/manager]
07-Jun-2022 23:00:06.588 INFO [Catalina-utility-2] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/apache-tomcat-10.0.21/webapps/manager] has finished in [276] ms

Could you please try lower Tomcat version (e.g. Tomcat 9)?

Ok). I tried to use Tomcat 9.0.63 creating a new Run Configuration.

It works. 

And I hope it will work with the Tomcat-10 release soon.

But it is sad that there aren't any warnings and cautions about using the latest Tomcat release. 

Many thanks!)

You are welcome! Seems we have related request on YouTrack: https://youtrack.jetbrains.com/issue/IDEA-277823/Support-deployment-to-the-Tomcat-10-webapps-javaee-directory. Please vote for it and follow the updates.

I'm getting a 404 error

Hello,

Have you tried lower Tomcat version?

Hi, Yaroslav, can I get your advice or anyone help me
My problem is that I see that my artifact was deployed sucessfully but it gives 404 not found
I am using tomcat 9,0,71 and I am pretty sure that problem is not about the link, because I've already read previous 40 comments

Is it reproducible with some sample project, so I could check it on my side?

Do you want to get screenshots or full directory?

It would be better to have project itself, so I could fully check it on my side.

https://github.com/NEsbolganov/SpringMVC
There my project is

Thanks for the example. I couldn't find what is wrong there. You may try to use project from this article as a template: https://mkyong.com/spring-mvc/spring-mvc-hello-world-example/

@... ty for your attemt of finding out the problem of my learning proccess! I really appreciate that, and I checked out your source, very helpful TY TY TY!

You are welcome!