java问题：index.jsp文件无法显示到指定端口？

Question

I am writing a very simple demo java spring website and here is my problem.

I put the index.jsp file in this folder

src/main/webapp/index.jsp

And the file is very simple

I configured my file as the tutorial (changed all the port from 8080 to 8888), in the folder src/main/webapp/WEB-INF I made 2 files

demo-config-servlet.xml and web.xml, there were no error.

Then I ran the file index.jsp, there was no error, as you can see in this picture

But when I ran DemoSpringMVC by Run As -> Run on Server -> (I choose Tomcat v10.0) I got this error

Here is my code

https://github.com/nguyencuc2586/Demo

Do you think it is because of the port 8888? Or the version of Tomcat? Could you please give me some advices? Thank you in advance.

Answer 1

Looked at your code on GitHub. There are a couple of issues in web.xml .

• You need to tell the DispatcherServlet to load the context configuration (the one you defined in the demo-config-servlet.xml ) by specifying the contextConfigLocation init-param.
• Also map the dispatcher servlet correctly.

Look at the updated web.xml below (added comments at the sections I added/modified):

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
    <servlet>
        <servlet-name>demo-config</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    
    <!-- Mapped the servlet to '/' -->
    <servlet-mapping>
        <servlet-name>demo-config</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

EDIT: Added some explanation of the changes

Spring Dispatcher servlet mapping needs to be a valid url-pattern. / in the pattern means that the servlet will be mapped to the 'root'

<url-pattern>/<url-pattern>

In your case, this should take care of the issue. However, if for some reason the context still does not load, try specifying the context configuration to the servlet by using the <init-param> settings given below:

<!-- Added the context configuration below -->
<init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/demo-config-servlet.xml</param-value>
</init-param>

Read about the configuration in the docs here - https://docs.spring.io/spring-framework/docs/3.2.x/spring-framework-reference/html/mvc.html#mvc-servlet