Java Spring boot controller @RequestParam gives error "Required String parameter 'name' is not present"

Question

I'm building an app using Spring boot. The problem started when I was trying to upload a file to server and thought this was a MultipartFile problem. But then I tried submitting a simple form with POST method to Spring @Controller and it got the same error. After hours of searching I could not find anything similar.

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" type="text/css" href="/webjars/bootstrap/4.1.3/css/bootstrap.min.css"/>
    <script type="text/javascript" src="/webjars/jquery/3.3.1/jquery.min.js"></script>
    <script type="text/javascript" src="/webjars/bootstrap/4.1.3/js/bootstrap.min.js"></script>
    <title>Title</title>
</head>
<body>
<div class="container">
    <div class="card">
        <div class="card-body">
            <div class="offset-3 col-6">
                <form method="post"
                      action="/save">
                    <input type="text"  class="form-control" name="name">
                    <input type="submit" class="btn btn-primary" value="Save">
                </form>
            </div>
        </div>
    </div>
</div>
</body>
</html>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.tantsurepertuaar</groupId>
    <artifactId>tantsurepertuaar</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>tantsurepertuaar</name>
    <description></description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!--<dependency>-->
            <!--<groupId>org.springframework.boot</groupId>-->
            <!--<artifactId>spring-boot-starter-security</artifactId>-->
        <!--</dependency>-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-core</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--<dependency>-->
            <!--<groupId>org.springframework.security</groupId>-->
            <!--<artifactId>spring-security-test</artifactId>-->
            <!--<scope>test</scope>-->
        <!--</dependency>-->
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>4.1.3</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

Controller

package com.tantsurepertuaar.tantsurepertuaar.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class TestController {

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String save(@RequestParam("name") String name) {
        return "redirect:/";
    }
}

When I check browser developer tools then I can see that in FormData there is a parameter called "name" and it has the entered value.

When I use GET method then I had no problems using @RequestParam.

Can it be that it has something to do with my project configuration or am I missing something completely here?

Thanks

`@RequestParam` is used to map URL params, such as in `GET`, use `@RequestBody` with a DTO instead. — benjamin c, Oct 04 '18 at 12:55
Hi, I see you're new to SO. If you feel an answer solved the problem, please mark it as 'accepted' by clicking the green check mark — Sven Hakvoort, Oct 10 '18 at 14:12

score 2 · Accepted Answer · answered Oct 04 '18 at 12:56

The @RequestParam annotation you are using is for GET paramaters (passed via the URL), in order to retrieve the values of a POST parameter you have to use the @RequestBody annotation.

So your code should be like this:

@Controller
public class TestController {

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String save(@RequestBody("name") String name) {
        return "redirect:/";
    }
}

score 1 · Answer 2 · answered Oct 04 '18 at 12:51

    package com.tantsurepertuaar.tantsurepertuaar.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class TestController {

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String save(@ModelAttribute String name) {
        return "redirect:/";
    }
}

try this?

score 1 · Answer 3 · answered Oct 04 '18 at 13:03

if you redirect and want to use @Requestparam value that you get from 'form' in the redirect address .. you need to use Redirectattributes .

@RequestMapping(value = "/save", method = RequestMethod.POST)
public String save(@RequestParam("name") String name,RedirectAttributes redirectAttributes) {
    redirectAttributes.addFlashAttribute("name","name");
    return "redirect:/";
}
@RequestMapping(value = "/", method = RequestMethod.GET)
public String homeMethod(@ModelAttribue("name") String name){
    return "name"; 
}

ModelAttribute will help you get that redirectflashattributes ..

Java Spring boot controller @RequestParam gives error "Required String parameter 'name' is not present"

3 Answers3