apache/skywalking · error · IllegalArgumentException

Output type has no setter for field ' ' (tried: )

Error message

Output type {outputTypeName} has no setter for field '{fieldType}' (tried: {candidates})

What it means

Thrown by Layer.unregisterDynamic when asked to remove a layer that was not registered through registerDynamic. The DYNAMIC_NAMES ownership set records exactly which names came from the runtime-dynamic channel; built-in Layer constants, layer-extensions.yml entries, SPI extensions, and bundled MAL/LAL definitions arrived via boot-time register() and are permanently non-removable. Distinguishing by ordinal range alone was tried and was unsafe (boot-time extensions can legitimately sit >= 100_000).

Solutions

1. Only call unregisterDynamic for names your code previously registered via registerDynamic (track them yourself)
2. If you want the layer gone permanently, remove its declaration from layer-extensions.yml / the MAL/LAL boot file and restart the OAP
3. If refcount-driven runtime rules are in play, check the RuntimeLayerRegistry refcounts rather than unregistering ad hoc

Example fix

// before
Layer.unregisterDynamic("OS_LINUX"); // built-in, throws
// after — static layers are removed by config + restart, not at runtime
// remove the entry from layer-extensions.yml and restart OAP

// only unregister names your code registered dynamically
if (dynamicLayersICreated.remove(name)) Layer.unregisterDynamic(name);

When it happens

Trigger: Calling Layer.unregisterDynamic("K8S") or Layer.unregisterDynamic("MY_STATIC_EXT") where the name exists but was registered via Layer.register at boot. No-op if the name is unknown; throws only for known-but-static layers.

Common situations: Custom tooling that walks the registry and unregisters everything on shutdown; a runtime-rule loader bug that drops refcounts for layers it never owned; attempting to remove a built-in layer to 'clean up' the UI.

Related errors

• Failed to compile hierarchy rule
• Failed to load GenAI configuration file.
• Hierarchy rule parsing failed
• Load meter analyzer configs failed
• Output field ' ' requires outputType to be set in the LAL…

AI-assisted analysis of apache/skywalking@102af09b4a (2026-08-14). Data as JSON: /api/errors/0a0f6c778c516f46. Report an issue: GitHub.

Appendix: source

Thrown at oap-server/analyzer/log-analyzer/src/main/java/org/apache/skywalking/oap/log/analyzer/v2/compiler/LALBlockCodegen.java:262

     *
     * <p>Standard fields: service, instance, endpoint, layer, traceId,
     * segmentId, spanId, timestamp.
     */
    private static void generateFieldToOutput(
            final StringBuilder sb,
            final LALScriptModel.FieldAssignment field,
            final LALClassGenerator.GenCtx genCtx) {
        final String[] candidates =
            FIELD_TYPE_SETTER_CANDIDATES[field.getFieldType().ordinal()];
        Method setter = null;
        for (final String candidate : candidates) {
            setter = findSetter(genCtx.outputType, candidate);
            if (setter != null) {
                break;
            }
        }
        if (setter == null) {
            throw new IllegalArgumentException(
                "Output type " + genCtx.outputType.getName()
                + " has no setter for field '" + field.getFieldType().name().toLowerCase()
                + "' (tried: " + String.join(", ", candidates) + ")");
        }

        final Class<?> paramType = setter.getParameterTypes()[0];
        final String effectiveCast = resolveEffectiveCast(paramType, field.getCastType());
        sb.append("  _o.").append(setter.getName()).append("(");
        if (field.getFormatPattern() != null) {
            // Format pattern provided in LAL script (e.g., timestamp ... , "yyyy/MM/dd HH:mm:ss")
            sb.append("h.parseTimestamp(");
            LALValueCodegen.generateCastedValueAccess(sb, field.getValue(), "String", genCtx);
            sb.append(", \"")
              .append(DslJavaSourceText.toLiteral(field.getFormatPattern()))
              .append("\")");
        } else if (paramType.isEnum() || paramType == Layer.class) {
            // `Layer` was historically an enum and is now a registry-backed value type with a
            // matching `valueOf(String)`; both flow through the same `Type.valueOf(string)`

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