skylot/jadx · error · JadxRuntimeException

Unsupported type for raw invoke-custom: {}

Error message

Unsupported type for raw invoke-custom: {}

What it means

Thrown by EncodedValueUtils.convertToInsnArg when an invoke-custom bootstrap-method argument has an EncodedValue type not handled by the switch - i.e. something other than the primitives, STRING, TYPE, METHOD_TYPE, or METHOD_HANDLE (for example ENCODED_ARRAY, ENCODED_ANNOTATION, ENCODED_ENUM, ENCODED_FIELD, ENCODED_METHOD, or a new encoded type). invoke-custom args that are arrays/annotations/enum/field/method references are not yet converted to InsnArg form.

Source

Thrown at jadx-core/src/main/java/jadx/core/utils/EncodedValueUtils.java:101

			case ENCODED_INT:
			case ENCODED_LONG:
			case ENCODED_FLOAT:
			case ENCODED_DOUBLE:
				return (InsnArg) convertToConstValue(value);

			case ENCODED_BOOLEAN:
				return InsnArg.lit(((Boolean) obj) ? 0 : 1, ArgType.BOOLEAN);
			case ENCODED_STRING:
				return InsnArg.wrapArg(new ConstStringNode((String) obj));
			case ENCODED_TYPE:
				return InsnArg.wrapArg(new ConstClassNode(ArgType.parse((String) obj)));
			case ENCODED_METHOD_TYPE:
				return InsnArg.wrapArg(buildMethodType(root, (IMethodProto) obj));
			case ENCODED_METHOD_HANDLE:
				return InsnArg.wrapArg(buildMethodHandle(root, (IMethodHandle) obj));

		}
		throw new JadxRuntimeException("Unsupported type for raw invoke-custom: " + value.getType());
	}

	private static InvokeNode buildMethodType(RootNode root, IMethodProto methodProto) {
		ArgType retType = ArgType.parse(methodProto.getReturnType());
		List<ArgType> argTypes = Utils.collectionMap(methodProto.getArgTypes(), ArgType::parse);
		List<ArgType> callTypes = new ArrayList<>(1 + argTypes.size());
		callTypes.add(retType);
		callTypes.addAll(argTypes);
		ArgType mthType = ArgType.object("java.lang.invoke.MethodType");
		ClassInfo cls = ClassInfo.fromType(root, mthType);
		MethodInfo mth = MethodInfo.fromDetails(root, cls, "methodType", callTypes, mthType);
		InvokeNode invoke = new InvokeNode(mth, InvokeType.STATIC, callTypes.size());
		for (ArgType type : callTypes) {
			InsnNode argInsn;
			if (type.isPrimitive()) {
				argInsn = new IndexInsnNode(InsnType.SGET, getTypeField(root, type.getPrimitiveType()), 0);
			} else {
				argInsn = new ConstClassNode(type);

View on GitHub (pinned to e738a26571)

Solutions

1. Update jadx; encoded-value handling for invoke-custom is expanded over releases.
2. Report the input and the encoded type from the message so the missing case can be added.
3. Skip the affected class and continue the batch.
4. Catch JadxRuntimeException around decompilation when using jadx as a library.

try {
    InsnArg arg = EncodedValueUtils.convertToInsnArg(root, value);
} catch (JadxRuntimeException e) {
    LOG.warn("unsupported invoke-custom encoded type {}", value.getType(), e);
}

When it happens

Trigger: Decompiling a class whose invoke-custom (LambdaMetafactory or custom bootstrap) declares a bootstrap argument that is an array, annotation, enum, field, or method encoded value. convertToInsnArg exhausts its switch cases and falls through to the throw.

Common situations: Apps that use non-LambdaMetafactory bootstraps with rich bootstrap arguments (e.g. string-dedup or constant-dynamic style), bytecode from newer DEX tooling, or hand-crafted invoke-custom instructions. Common bytecode (lambdas) only uses METHOD_TYPE/METHOD_HANDLE/TYPE/STRING and never hits this.

Related errors

• Can't build insn arg from encoded value: {}
• Failed to generate code for class: ${cls.getFullName()}
• Failed to process class: ${cls.getFullName()}
• Failed to process method to visitor:
• Failed to generate 'invoke-custom' instruction:

AI-assisted analysis of skylot/jadx@e738a26571 (2026-08-14). Data as JSON: /api/errors/934a3e899baf8b4e. Report an issue: GitHub.