quarkusio/quarkus · error · RuntimeException

Unrecognized primitive " + c

Error message

Unrecognized primitive " + c

What it means

getMethodDescriptor() builds a JVM-style descriptor string and getDescriptorForClass() maps primitives to their JVM letters. Reaching the final throw means an unrecognized Class object was passed as a primitive — an internal invariant violation rather than user error.

Source

Thrown at extensions/funqy/funqy-server-common/runtime/src/main/java/io/quarkus/funqy/runtime/FunctionRegistry.java:66

            if (c == byte.class)
                return "B";
            if (c == char.class)
                return "C";
            if (c == double.class)
                return "D";
            if (c == float.class)
                return "F";
            if (c == int.class)
                return "I";
            if (c == long.class)
                return "J";
            if (c == short.class)
                return "S";
            if (c == boolean.class)
                return "Z";
            if (c == void.class)
                return "V";
            throw new RuntimeException("Unrecognized primitive " + c);
        }
        if (c.isArray())
            return c.getName().replace('.', '/');
        return ('L' + c.getName() + ';').replace('.', '/');
    }

    private static String getMethodDescriptor(Method m) {
        String s = "(";
        for (final Class c : m.getParameterTypes())
            s += getDescriptorForClass(c);
        s += ')';
        return s + getDescriptorForClass(m.getReturnType());
    }
}

View on GitHub (pinned to e1c734241f)

Solutions

1. Clean rebuild and restart with a standard JDK to rule out stale/corrupted classes
2. Disable custom agents/instrumentation and retry
3. Report to Quarkus Funqy maintainers with the class name in the message if reproducible

// Validate the class is a supported kind before descriptor computation
if (!(c.isPrimitive() || c.isArray() || !c.isInterface() || c.isInterface()))
    throw new IllegalArgumentException("Unsupported class for descriptor: " + c);

try {
    String desc = FunctionRegistry.getMethodDescriptor(m);
} catch (RuntimeException e) {
    if (e.getMessage().startsWith("Unrecognized primitive")) {
        log.errorf(e, "Descriptor computation hit an unexpected class; check JDK/agent setup");
    }
    throw e;
}

When it happens

Trigger: Only reachable if a Class representing neither a known primitive, an array, nor a normal class reaches descriptor computation — typically with exotic classloader artifacts or a corrupted class reference.

Common situations: Very rare; may surface with broken instrumentation agents, mismatched JDK versions, or custom classloader tricks during Funqy registry building.

Related errors

• Method "" + methodDescription + "" not found.
• RuntimeException(e)
• RuntimeException(e)
• Couldn't extract all parameters information for constructor
• Failed to set dev services config

AI-assisted analysis of quarkusio/quarkus@e1c734241f (2026-09-05). Data as JSON: /api/errors/633f0f9caa653f16. Report an issue: GitHub.