[Bug]: HiveMQExtension / Class Loading Issue

Module

HiveMQ

Testcontainers version

1.20.6

Using the latest Testcontainers version?

Yes

Host OS

Linux

Host Arch

x64

Docker version

27.4

What happened?

Hello,

if you want to proplery JUnit Test a HiveMQExtension you need to unfortunately add all depencies used via the method "addAdditionalClass". However the following code leads to an exception "Unclosed character class near index 6
/[B$.*" due to following code:

    private void putSubclassesIntoJar(
        final @NotNull String extensionId,
        final @Nullable Class<?> clazz,
        final @NotNull JavaArchive javaArchive
    ) throws NotFoundException {
        if (clazz != null) {
            final Set<String> subClassNames = ClassPool
                .getDefault()
                .get(clazz.getName())
                .getClassFile()
                .getConstPool()
                .getClassNames();
            for (final String subClassName : subClassNames) {
                final String className = subClassName.replaceAll("/", ".");

                if (!className.startsWith("[L")) {
                    LOGGER.debug("Trying to package subclass '{}' into extension '{}'.", className, extensionId);
                    javaArchive.addClass(className);
                } else {
                    LOGGER.debug("Class '{}' will be ignored.", className);
                }
            }
        }
    }

Based on inpuit "subClassNames" can include "[B" in additition to "[L" (already checked). I would propose to add another case OR allow the proplery extend this class in general (unfortunately private constructor) ...

Relevant log output

Additional Information

No response

Start at the putSubclassesIntoJar method shown in the report and inspect how ClassPool class names are converted before JavaArchive.addClass is called. Reproduce the HiveMQExtension setup with addAdditionalClass and a [B entry, then verify that class loading completes without the reported exception and that the existing [L handling remains unchanged.