SpringBoot No HttpMessageConverter for xxx.xxx.xx when I fetch json use RestClient with spring boot native

I'm use Spring boot 3.4.1 on graalvm 21.0.5

This is a simple WebApplication includes two classes

• The first class is LoginEntity

package xzcode.nativedemo.request;

import java.io.Serial;
import java.io.Serializable;

public record LoginEntity(
        String acctID,
        String username,
        String password,
        String lcid
) implements Serializable {
    @Serial
    private static final long serialVersionUID = 8219088952080888490L;
}

• the 2nd class is Application class

package xzcode.nativedemo;

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestClient;
import xzcode.nativedemo.request.LoginEntity;

import java.net.URI;

@SpringBootApplication
public class NativeDemoApplication implements ApplicationRunner {

    private final RestClient.Builder clientBuilder;

    public NativeDemoApplication(RestClient.Builder clientBuilder) {
        this.clientBuilder = clientBuilder;
    }

    public static void main(String[] args) {
        SpringApplication.run(NativeDemoApplication.class);
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        LoginEntity loginEntity = new LoginEntity(
                "65003cf500b386",
                "kingdee",
                "666666",
                "2052"
        );

        ResponseEntity<String> response = clientBuilder.build()
                .post()
                .uri(new URI("https://www.google.com"))
                .body(loginEntity)
                .retrieve()
                .toEntity(String.class);
        System.out.println(response.getBody());
    }
}

and this is my build.gradle.kts

plugins {
    java
    id("org.springframework.boot") version "3.4.0"
    id("io.spring.dependency-management") version "1.1.7"
    id("org.graalvm.buildtools.native") version "0.10.4"
}

group = "com.xzcode"
version = "0.0.1-SNAPSHOT"

java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(17)
    }
}

repositories {
    mavenCentral()
}

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-web")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
    testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
}

tasks.withType<Test> {
    useJUnitPlatform()
}

when I run this application with normal java application . it is run success.

but when i Build it to a native application use gradlew nativeCompile, and run the exe file on windows. the error reported

org.springframework.web.client.RestClientException: No HttpMessageConverter for xzcode.nativedemo.request.LoginEntity
        at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.writeWithMessageConverters(DefaultRestClient.java:504)
        at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.lambda$body$0(DefaultRestClient.java:455)
        at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.exchangeInternal(DefaultRestClient.java:563)
        at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.exchange(DefaultRestClient.java:532)
        at org.springframework.web.client.RestClient$RequestHeadersSpec.exchange(RestClient.java:677)
        at org.springframework.web.client.DefaultRestClient$DefaultResponseSpec.executeAndExtract(DefaultRestClient.java:806)
        at org.springframework.web.client.DefaultRestClient$DefaultResponseSpec.toEntityInternal(DefaultRestClient.java:766)
        at org.springframework.web.client.DefaultRestClient$DefaultResponseSpec.toEntity(DefaultRestClient.java:755)
        at xzcode.nativedemo.NativeDemoApplication.run(NativeDemoApplication.java:40)
        at org.springframework.boot.SpringApplication.lambda$callRunner$4(SpringApplication.java:784)
        at org.springframework.util.function.ThrowingConsumer$1.acceptWithException(ThrowingConsumer.java:82)
        at org.springframework.util.function.ThrowingConsumer.accept(ThrowingConsumer.java:60)
        at org.springframework.util.function.ThrowingConsumer$1.accept(ThrowingConsumer.java:86)
        at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:796)
        at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:784)
        at org.springframework.boot.SpringApplication.lambda$callRunners$3(SpringApplication.java:772)
        at java.base@21.0.5/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
        at java.base@21.0.5/java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:357)
        at java.base@21.0.5/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:510)
        at java.base@21.0.5/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base@21.0.5/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
        at java.base@21.0.5/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
        at java.base@21.0.5/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base@21.0.5/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
        at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:772)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:325)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
        at xzcode.nativedemo.NativeDemoApplication.main(NativeDemoApplication.java:23)
        at java.base@21.0.5/java.lang.invoke.LambdaForm$DMH/sa346b79c.invokeStaticInit(LambdaForm$DMH)

the project repository is https://github.com/ldwqh0/nativeDemo

Comment From: snicoll

Thanks for the report and the sample. This is working as expected, we know nothing about LoginEntity since you're requesting this type to be serialized programmatically. You need to register this type for GraalVM to be able to handle the reflection. I've added @RegisterReflectionHints(LoginEntry.class) on NativeDemoApplication and that fixed it.

Going forward, please do not paste code and build scripts in the description as all that information is already available in the sample's repository.