Hi Stuart, all toArray-methods implementations in the classes SecureHashMap$KeySet SecureHashMap$Values SecureHashMap$EntrySet are broken and throw StackOverflowError. The methods can be removed from this classes because the parent class AbstractCollection provides valid implementations of this methods. The class SecureHashMap is not used in Undertow and I think it is not used in WildFly too. Therefore maybe it makes sense to remove the whole class SecureHashMap. Best regards, Andrej Golovnin