Types.toResolvedType does not resolve types with wildcard correctly ------------------------------------------------------------------- Key: ROASTER-135 URL: https://issues.redhat.com/browse/ROASTER-135 Project: Roaster Issue Type: Bug Components: API Affects Versions: 2.21.1.Final Reporter: Viktor Micsko Priority: Major Fix For: 2.21.2.Final (2.21.2.Final and 2.21.3-SNAPSHOT are also affected) https://github.com/forge/roaster/blob/master/api/src/main/java/org/jboss/... Types.toResolvedType joins the generic parts using comma as follows: {code:java} if (Types.isGeneric(type)) { StringJoiner genericJoiner = new StringJoiner(","); for (String genericPart : Types.splitGenerics(type)) { genericJoiner.add(toResolvedType(genericPart, importer)); } builder.append("<").append(genericJoiner.toString()).append(">"); } {code} This behaviour is incorrect for types like List<? extends Number>. It also leads to the following being incorrectly generated as void return type for such types: {code:java} Type<JavaInterfaceSource> returnType = ... MethodSource<JavaClassSource> method = ... destinationMethod.setReturnType(returnType); {code} A simple fix would be: {code:java} if (Types.isGeneric(type)) { StringJoiner genericJoiner = new StringJoiner(","); for (String genericPart : Types.splitGenerics(type)) { genericJoiner.add(toResolvedType(genericPart, importer)); } String genericParts = genericJoiner.toString(); genericParts = genericParts.replace("?extends", "? extends "); genericParts = genericParts.replace("?super", "? super "); builder.append("<").append(genericParts).append(">"); } {code}