Error running Quarkus: java.lang.ExceptionInInitializerError > @POST with Record

[myfear]

Describe the bug

Quarkus 3.30.2 on Java 21

I have a Rest endpoint (tried with an without @BeanParam, same result):

 @POST
    @Produces("image/png")
    @Consumes(MediaType.APPLICATION_JSON)
    public Response generate(@BeanParam QRCodeConfig cfg) {

And the

public record QRCodeConfig(
        String text,
        Integer size,

And I get a weird error starting my application:

6:53:34,858 ERROR [io.qua.run.Quarkus] Error running Quarkus: java.lang.ExceptionInInitializerError
    at java.base/jdk.internal.misc.Unsafe.allocateInstance(Native Method)
    at java.base/java.lang.invoke.DirectMethodHandle.allocateInstance(DirectMethodHandle.java:501)
    at io.quarkus.runtime.Quarkus.run(Quarkus.java:79)
    at io.quarkus.runtime.Quarkus.run(Quarkus.java:51)
    at io.quarkus.runtime.Quarkus.run(Quarkus.java:144)
    at io.quarkus.runner.GeneratedMain.main(Unknown Source)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at java.base/java.lang.reflect.Method.invoke(Method.java:580)
    at io.quarkus.runner.bootstrap.StartupActionImpl$1.run(StartupActionImpl.java:135)
    at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.lang.RuntimeException: Failed to start quarkus
    at io.quarkus.runner.ApplicationImpl.<clinit>(Unknown Source)
    ... 10 more
Caused by: java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    com/example/QRCodeConfig.__quarkus_rest_inject(Lorg/jboss/resteasy/reactive/server/injection/ResteasyReactiveInjectionContext;)Lcom/example/QRCodeConfig; @31: invokespecial
  Reason:
    Type uninitialized 27 (current frame, stack[1]) is not assignable to 'java/lang/Integer'
  Current Frame:
    bci: @31
    flags: { }
    locals: { 'org/jboss/resteasy/reactive/server/injection/ResteasyReactiveInjectionContext', null, null, null, null, null, null, null, null, null, null }
    stack: { uninitialized 27, uninitialized 27 }
  Bytecode:
    0000000: 014c 014d 014e 013a 0401 3a05 013a 0601
    0000010: 3a07 013a 0801 3a09 013a 0abb 0001 59b7
    0000020: 0063 b0

    at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
    at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3578)
    at java.base/java.lang.Class.getMethodsRecursive(Class.java:3719)
    at java.base/java.lang.Class.getMethod0(Class.java:3705)
    at java.base/java.lang.Class.getMethod(Class.java:2393)
    at org.jboss.resteasy.reactive.server.core.parameters.RecordBeanParamExtractor.<init>(RecordBeanParamExtractor.java:16)
    at org.jboss.resteasy.reactive.server.core.startup.RuntimeResourceDeployment.parameterExtractor(RuntimeResourceDeployment.java:708)
    at org.jboss.resteasy.reactive.server.core.startup.RuntimeResourceDeployment.buildResourceMethod(RuntimeResourceDeployment.java:346)
    at org.jboss.resteasy.reactive.server.core.startup.RuntimeDeploymentManager.deploy(RuntimeDeploymentManager.java:137)
    at io.quarkus.resteasy.reactive.server.runtime.ResteasyReactiveRecorder.createDeployment(ResteasyReactiveRecorder.java:163)
    at io.quarkus.runner.recorded.ResteasyReactiveProcessor$setupDeployment944680882.deploy_0(Unknown Source)
    at io.quarkus.runner.recorded.ResteasyReactiveProcessor$setupDeployment944680882.deploy(Unknown Source)

Expected behavior

It works :)

Actual behavior

Exception during startup.

How to Reproduce?

I have a reproducer here:
https://github.com/myfear/ejq_substack_articles/tree/main/qr-designer

Just quarkus dev and see the exception.
mvn compile works.

Output of uname -a or ver

Darwin Kernel Version 25.1.0

Output of java -version

OpenJDK Runtime Environment Temurin-21.0.8+9 (build 21.0.8+9-LTS)

Quarkus version or git rev

3.30.2

Build tool (ie. output of mvnw --version or gradlew --version)

Apache Maven 3.9.11 (3e54c93a704957b63ee3494413a2b544fd3d825b)

Additional information

No response

[gsmet]

@dmlloyd could it be related to your work on the stack maps?

[dmlloyd]

It looks like __quarkus_rest_inject is still generated by ASM. It is generated in one of two possible places: org.jboss.resteasy.reactive.server.processor.generation.multipart.MultipartTransformer and org.jboss.resteasy.reactive.server.processor.scanning.ClassInjectorTransformer.

[dmlloyd]

I think this one in particular must have been generated by org.jboss.resteasy.reactive.server.processor.scanning.ClassInjectorTransformer.ClassInjectorVisitor#visitEnd. As far as I can tell from the comments, the invokespecial call should not have been generated because it's for a record class. Maybe @FroMage can give more insight here.

[quarkus-bot]

/cc @FroMage (rest)

[geoand]

Where are the params of QRCodeConfig supposed to come from?

Obviously, we should never be throwing VerifyError, but I think in this case, what is being attempted is incorrect, so what we need to do is throw a proper exception

[myfear]

Well, I thought they get mapped?

curl -X POST \
  -H "Content-Type: application/json" \
  -d '{"text":"https://example.com","size":300}' \
  http://localhost:8080/your-endpoint-path \
  --output qrcode.png

[geoand]

Ah, in that case you should just drop @BeanParam

[myfear]

Doesn’t work with either though. With or without.

…

On Sat, Dec 6, 2025 at 10:05 Georgios Andrianakis ***@***.***> wrote: *geoand* left a comment (quarkusio/quarkus#51431) <#51431 (comment)> Ah, in that case you should just drop @BeanParam — Reply to this email directly, view it on GitHub <#51431 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAKLVWTYSLB3OIO3WIGWWBD4AKL6FAVCNFSM6AAAAACOFP7MPWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTMMJZG44DENJWGE> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[geoand]

You also need to switch @Consumes from form params to JSON.

@POST
@Produces("image/png")
@Consumes(MediaType.APPLICATION_JSON)
public TemplateInstance generate(QRCodeConfig cfg) {

        byte[] png = service.generate(cfg);
        String base64 = Base64.getEncoder().encodeToString(png);

        return designer
                .data("qrImage", base64)
                .data("text", cfg.text())
                .data("size", cfg.size());
    }