How to detect from where 404 error is coming? debugger calls the method and works fine but then stil-CodePudding

package com.crudoperation;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @RequestMapping("/")
    public String helloGfg() {
        return "hii";
    }

    @PostMapping("/saveEmployee")
    public String saveEmployee(@ModelAttribute("employee") Employee employee) {
        employeeService.saveEmployee(employee);
        return "redirect:/showEmployee";
    }
}

debugger comes in helloGfg method but then it still showing 404 error..i think there will be some other dependency or annotaion based issues......how could i find the issue?below is my pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.crudoperation</groupId>
    <artifactId>crudoperation</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>crudoperation Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <spring.version>5.1.0.RELEASE</spring.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>javax.servlet.jsp.jstl-api</artifactId>
            <version>1.2.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring5</artifactId>
            <version>3.0.11.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jasper</artifactId>
            <version>8.5.51</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.2.17.Final</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>crudoperation</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

how to find from where the error is coming..in maven project in webapp directory when i seperately run as run on server then it did not even find seprate file..how to solve it?

this is my project structure..which thing i need to remove.i cannot understand.

here is the code for viewResolver

  package com.crudoperation;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.ComponentScan;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Description;
    import org.springframework.web.servlet.config.annotation.EnableWebMvc;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    import org.springframework.web.servlet.view.InternalResourceViewResolver;
    import org.springframework.web.servlet.view.JstlView;
    import org.thymeleaf.templateresolver.ServletContextTemplateResolver;
    
    @Configuration
    @EnableWebMvc
    @ComponentScan(basePackages = "com.crudoperation")
    public class EmployeeAppConfig implements WebMvcConfigurer {
        @Bean
        public InternalResourceViewResolver resolver() {
            InternalResourceViewResolver resolver = new InternalResourceViewResolver();
            resolver.setViewClass(JstlView.class);
            resolver.setPrefix("/WEB-INF/views/");
            resolver.setSuffix(".jsp");
            return resolver;
        }
    
    @Bean
    public SpringResourceTemplateResolver templateResolver() {
        // SpringResourceTemplateResolver automatically integrates with Spring's own
        // resource resolution infrastructure, which is highly recommended.
        SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
        templateResolver.setApplicationContext(this.applicationContext);
        templateResolver.setPrefix("/WEB-INF/templates/");
        templateResolver.setSuffix(".html");
        // HTML is the default value, added here for the sake of clarity.
        templateResolver.setTemplateMode(TemplateMode.HTML);
        // Template cache is true by default. Set to false if you want
        // templates to be automatically updated when modified.
        templateResolver.setCacheable(true);
        return templateResolver;
    }
    
        public void addResourceHandlers(ResourceHandlerRegistry resourceHandlerRegistry) {
            resourceHandlerRegistry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
        }
    }

CodePudding user response：

Try to define in webapp folder a hii.html file. helloGfg is returning hii but the resource with such name is missing.

CodePudding user response：

Now that you have both the ViewResolver in place, you can add/set Order to them. Try,

    templateResolver.setOrder(0); //or lower value