ClasscastException when using MultipartForm in dev mode

[tqvarnst]

Describe the bug

This problem is only related to running Quarkus in dev mode.

When using MultipartForm data in a post request during dev mode after a reload Quarkus throws a ClassCastException. Restarting Dev mode fixes the issue

Expected behavior

Hotreload of MutlipartForm object should be possible.

Actual behavior

ClassCastException

To Reproduce

See https://github.com/tqvarnst/reproducer

Configuration

# No config required to reproduce

Screenshots

Environment (please complete the following information):

Output of uname -a or ver

Darwin tqvarnst-mac 20.3.0 Darwin Kernel Version 20.3.0: Thu Jan 21 00:07:06 PST 2021; root:xnu-7195.81.3~1/RELEASE_X86_64 x86_64

Output of java -version

openjdk version "11.0.8" 2020-07-14
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.8+10)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.8+10, mixed mode)

GraalVM version (if different from Java)

Just JVM mode, no GraalVM required to reproduce

Quarkus version or git rev

1.13.2.Final

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

Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /Users/tqvarnst/.m2/wrapper/dists/apache-maven-3.6.3-bin/1iopthnavndlasol9gbrbg6bf2/apache-maven-3.6.3
Java version: 11.0.8, vendor: AdoptOpenJDK, runtime: /Users/tqvarnst/.sdkman/candidates/java/11.0.8.hs-adpt
Default locale: en_SE, platform encoding: UTF-8
OS name: "mac os x", version: "10.16", arch: "x86_64", family: "mac"

Additional context

N/A