Fix NullPointerException when unboxing null to int.
Change int to Integer to allow use null as code.
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@ -86,7 +86,7 @@ class WebSocketTransport implements Transport {
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return webSocketClient.stop().doOnEvent(t -> logger.info("WebSocket connection stopped."));
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}
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void onClose(int code, String reason) {
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void onClose(Integer code, String reason) {
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logger.info("WebSocket connection stopping with " +
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"code {} and reason '{}'.", code, reason);
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if (code != 1000) {
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