skylot/jadx · error · JadxRuntimeException

Unexpected inner type found: {}

Error message

Unexpected inner type found: {}

What it means

Thrown in the same inner-class parsing loop as error 122, but on a subsequent iteration. After successfully parsing at least one inner type, the loop encounters another '.' (lookAhead('.') is true), consumes it, and consumeObjectType(true) returns null. This indicates a multi-level inner-class chain (Outer.Mid.Inner) where one of the later links is missing or malformed.

Source

Thrown at jadx-core/src/main/java/jadx/core/dex/nodes/parser/SignatureParser.java:242

		if (!lookAhead('.')) {
			consume(';');
			return genericType;
		}
		consume('.');
		next();
		// type parsing not completed, proceed to inner class
		ArgType inner = consumeObjectType(true);
		if (inner == null) {
			throw new JadxRuntimeException("No inner type found: " + debugString());
		}
		// for every nested inner type create nested type object
		while (lookAhead('.')) {
			genericType = ArgType.outerGeneric(genericType, inner);
			consume('.');
			next();
			inner = consumeObjectType(true);
			if (inner == null) {
				throw new JadxRuntimeException("Unexpected inner type found: " + debugString());
			}
		}
		return ArgType.outerGeneric(genericType, inner);
	}

	private List<ArgType> consumeGenericArgs() {
		List<ArgType> list = new ArrayList<>();
		ArgType type;
		do {
			if (lookAhead('*')) {
				next();
				type = ArgType.wildcard();
			} else if (lookAhead('+')) {
				next();
				type = ArgType.wildcard(consumeType(), ArgType.WildcardBound.EXTENDS);
			} else if (lookAhead('-')) {
				next();
				type = ArgType.wildcard(consumeType(), ArgType.WildcardBound.SUPER);

View on GitHub (pinned to e738a26571)

Solutions

1. Upgrade jadx — inner-class signature handling improves across releases.
2. Wrap decompilation in try-catch for JadxRuntimeException and skip the class.
3. Report with the signature debug string from the error message.
4. Remove the Signature attribute from the affected class before decompiling.

try {
    javaClass.decompile();
} catch (JadxRuntimeException e) {
    LOG.warn("Deep inner-type parse failed in {}: {}", javaClass.getName(), e.getMessage());
}

When it happens

Trigger: Inside the while(lookAhead('.')) loop in consumeObjectType: genericType and inner are already populated from a prior iteration, another '.' is consumed, next() is called, but consumeObjectType(true) returns null (signature ended prematurely on a deeper nesting level).

Common situations: Deeply nested inner classes with corrupted signature attributes, typically from aggressive obfuscation or broken bytecode merging. The pattern Outer<T>.Mid.Inner where the signature is truncated after a second dot.

Related errors

• No inner type found: {}
• Bad name for type variable: {}
• Failed to parse generic types map
• Unexpected end of signature
• Can't parse type: {}, unexpected: {}

AI-assisted analysis of skylot/jadx@e738a26571 (2026-08-14). Data as JSON: /api/errors/e61fc8df0192ce66. Report an issue: GitHub.