Method cleanupWsClient

java/lib/src/main/java/io/github/ccxt/Exchange.java:1777–1793

(Client client, Object error)

    }

    @SuppressWarnings("unchecked")
    private void cleanupWsClient(Client client, Object error) {
        var clientsMap = (java.util.concurrent.ConcurrentHashMap<String, Client>) this.clients;
        var urlClient = clientsMap.get(client.url);
        if (urlClient != null) {
            urlClient.subscriptionsMap().clear();
            urlClient.reject(wrapAsNetworkError(error));
            clientsMap.remove(client.url);
            // NOTE: do NOT call urlClient.close() here. Empirical test (full
            // Java WS sweep) showed close()'s messageExecutor.shutdown() races
            // with in-flight handleMessage tasks the per-exchange tests still
            // need, causing 15 new exchanges to time out vs the baseline.
            // The leak the close() was meant to fix is slow-drip (virtual
            // threads ~1KB each); we'll address it via a different mechanism
            // (e.g. shutdown-on-Exchange.close() only, or a delayed shutdown).
        }
    }

    /**
     * Wrap raw Netty / I/O exceptions in a CCXT NetworkError so the test harness's