Korean character encoding/decoding issue

[pjh2259]

My system's using Spring Boot embedded Undertow.

AS-IS

• boot 2.6.6
• MultipartResolver : org.springframework.web.multipart.commons.CommonsMultipartResolver
• java 8

TO-BE

• boot 3.4.4
• MultipartResolver : org.springframework.web.multipart.support.StandardServletMultipartResolver
• java 17

In a changed environment, Unicode strings are displayed abnormally intermittently.

We are receiving and processing data in multipart/form-data format as @RequestParam. Previously, it was available normally, but in changed environments, the data sometimes appears abnormal.

Can you tell me what is causing this phenomenon and what to do about it?

[snicoll]

In a changed environment, Unicode strings are displayed abnormally intermittently.

@pjh2259 the issue is currently not actionable. If you want support, please take the time to build a small sample the team can use to reproduce the issue.

[pjh2259]

@snicoll
sample code

package src;

import org.apache.commons.codec.CharEncoding;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MIME;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;

public class springSample {

    public static void main(String[] args) throws Exception {
        JSONObject jsonBody = new JSONObject();

        String bodyStr = 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글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글포한글한글포함한글한글한글함한글한글한글포한글한글한글한글한글한글한글한글한글";

        jsonBody.put("contents", bodyStr);
        String testStr = jsonBody.toString();

        String url = "http://ourDomain/requestParamTest";
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost(url);

        MultipartEntityBuilder reqEntity = MultipartEntityBuilder.create();
        reqEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        String boundary = "-------------" + System.currentTimeMillis();
        reqEntity.setBoundary(boundary);
        reqEntity.addTextBody("approval", testStr, ContentType.create("multipart/form-data", MIME.UTF8_CHARSET));
        HttpEntity e = reqEntity.build();
        httpPost.setEntity(e);
        HttpResponse response = httpClient.execute(httpPost);
        HttpEntity resEntity = response.getEntity();
        String responseResult = EntityUtils.toString(resEntity, CharEncoding.UTF_8);
        System.out.println("responseResult : " + responseResult);
    }
}

responseResult : 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This is the part where we implement the controller on our service side.

@RequestMapping(value = "/requestParamTest", method = RequestMethod.POST, consumes = {"*/*"})
    public ApimRestResult requestParamTest(
                                  @RequestParam(name = APPROVAL, required = false) String approval)

@Bean
    public MultipartResolver multipartResolver() {
       StandardServletMultipartResolver multipartResolver = new StandardServletMultipartResolver();
       return multipartResolver;
    }

[sbrannen]

@pjh2259, the springSample code you have provided only uses types from org.apache and org.json. There are no imported Spring types that I can see.

Thus, it appears that the issue you are encountering does not reside in Spring.

In light of that, I am closing this issue.

However, if you can provide a minimal sample application (not just code snippets copied-and-pasted into issue comments) which demonstrates an issue in Spring, we can reopen this issue at that time.

[pjh2259]

@sbrannen
In the boot 2.6.6 environment, CommonsMultipartResolver was used

In the boot 3.4.4 environment, CommonsMultipartResolver is not available, so StandardServletMultipartResolver was used.

The sample code we sent you first is the sample code that creates and calls broken data in the source implemented by boot 3.4.4

We will also resend the sample code that processes the call, so please check it further.

package sample.conf;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.support.StandardServletMultipartResolver;

@Configuration
public class AppContextConfig {

    @Bean
    public MultipartResolver multipartResolver() {
       StandardServletMultipartResolver multipartResolver = new StandardServletMultipartResolver();
       return multipartResolver;
    }
}

package sample.ctl;

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class RequestController {

    @PostMapping("/requestParamTest")
    public String handleRequestParamTest(@RequestParam("approval") String approval) {
        System.out.println("Received approval : " + approval);
        return "Success: requestParamTest";
    }
}

package sample;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration;
import org.springframework.context.annotation.Import;
import org.springframework.scheduling.annotation.EnableAsync;
import sample.conf.AppContextConfig;

@Import(value={AppContextConfig.class})
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, ValidationAutoConfiguration.class})
@EnableAsync
public class SpringApplication {

    public static void main(String[] args) {
        org.springframework.boot.SpringApplication.run(SpringApplication.class, args);
    }
}

<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-undertow</artifactId>
			<scope>${containerScope}</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>com.vaadin.external.google</groupId>
					<artifactId>android-json</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-validation</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-ldap</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
			<exclusions>
				<exclusion>
					<groupId>org.springframework.boot</groupId>
					<artifactId>spring-boot-starter-tomcat</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>6.2.5</version>
		</dependency>
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-core</artifactId>
		</dependency>
		<dependency>
			<groupId>jakarta.servlet</groupId>
			<artifactId>jakarta.servlet-api</artifactId>
		</dependency>
	</dependencies>

This part is the test sample code that calls the service.

package src;

import org.apache.commons.codec.CharEncoding;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MIME;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;

public class springSample {

    public static void main(String[] args) throws Exception {
        JSONObject jsonBody = new JSONObject();

        String bodyStr = 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글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글한글";

        jsonBody.put("contents", bodyStr);
        String testStr = jsonBody.toString();

        String param_url = "http://localhost:8080/requestParamTest";
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost param_httpPost = new HttpPost(param_url);

        MultipartEntityBuilder reqEntity = MultipartEntityBuilder.create();
        reqEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        String boundary = "-------------" + System.currentTimeMillis();
        reqEntity.setBoundary(boundary);
        reqEntity.addTextBody("approval", testStr, ContentType.create("multipart/form-data", MIME.UTF8_CHARSET));
        HttpEntity e = reqEntity.build();
        param_httpPost.setEntity(e);
        HttpResponse response = httpClient.execute(param_httpPost);
        HttpEntity resEntity = response.getEntity();
        String responseResult = EntityUtils.toString(resEntity, CharEncoding.UTF_8);
    }
}

I checked and this is the result of RequestController in Spring. (System.out.println("Received approval : " + approval);)

Received approval : 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[pjh2259]

@sbrannen @snicoll The project file has been uploaded. I would appreciate your confirmation.

• Client Project : MyIntelliTest.zip MyIntelliTest.zip

• Server Project : techexm.zip techexm.zip
  . Server(Springboot) Application : techexm-0.0.1-SNAPSHOT.jar (decompression : techexm-0.0.1-SNAPSHOT.zip) techexm-0.0.1-SNAPSHOT.zip
  jar files cannot be attached, so they are transferred to zip
  ==> RUN : java -jar techexm-0.0.1-SNAPSHOT.jar

• Result of Request(Client to Server)
  . result.png

[sdeleuze]

Reopening to evaluate the provided reproducer.