Clojurians Log v2

ERROR hyperfiddle.electric-ring-adapter3: Websocket error
clojure.lang.ExceptionInfo: assertion failed: (some? (aget state on-message-slot)) for (aget state on-message-slot) = nil

    electric on-message handler is not available. The electric server process failed to properly shut down *before* receiving the current message. Please report this issue.
	at contrib.assert$_is.invokeStatic(assert.cljc:26)
	at contrib.assert$_is.invoke(assert.cljc:23)
	at hyperfiddle.electric_ring_adapter3$electric_ws_handler$on_message__145867.invoke(electric_ring_adapter3.clj:205)
	at clojure.lang.AFn.applyToHelper(AFn.java:156)
	at clojure.lang.AFn.applyTo(AFn.java:144)
	at clojure.core$apply.invokeStatic(core.clj:669)
	at clojure.core$apply.invoke(core.clj:662)
	at hyperfiddle.electric_ring_adapter3$ring_ws_handler$fn__145877$fn__145878.doInvoke(electric_ring_adapter3.clj:235)
	at clojure.lang.RestFn.invoke(RestFn.java:426)
	at ring.websocket$eval145544$fn__145548.invoke(websocket.clj:13)
	at ring.websocket.protocols$eval145309$fn__145310$G__145294__145319.invoke(protocols.clj:3)
	at ring.adapter.jetty$websocket_listener$reify__146228.onWebSocketText(jetty.clj:76)
	at org.eclipse.jetty.websocket.core.internal.messages.StringMessageSink.accept(StringMessageSink.java:53)
	at org.eclipse.jetty.websocket.common.JettyWebSocketFrameHandler.acceptMessage(JettyWebSocketFrameHandler.java:348)
	at org.eclipse.jetty.websocket.common.JettyWebSocketFrameHandler.onTextFrame(JettyWebSocketFrameHandler.java:436)
	at org.eclipse.jetty.websocket.common.JettyWebSocketFrameHandler.onFrame(JettyWebSocketFrameHandler.java:241)
	at org.eclipse.jetty.websocket.core.internal.WebSocketCoreSession$IncomingAdaptor.lambda$onFrame$1(WebSocketCoreSession.java:671)
	at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1466)
	at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1485)
	at org.eclipse.jetty.websocket.core.server.internal.AbstractHandshaker$1.handle(AbstractHandshaker.java:212)
	at org.eclipse.jetty.websocket.core.internal.WebSocketCoreSession$IncomingAdaptor.onFrame(WebSocketCoreSession.java:671)
	at org.eclipse.jetty.websocket.core.AbstractExtension.nextIncomingFrame(AbstractExtension.java:145)
	at org.eclipse.jetty.websocket.core.internal.PerMessageDeflateExtension.nextIncomingFrame(PerMessageDeflateExtension.java:236)
	at org.eclipse.jetty.websocket.core.internal.DemandingFlusher.emitFrame(DemandingFlusher.java:145)
	at org.eclipse.jetty.websocket.core.internal.PerMessageDeflateExtension$IncomingFlusher.inflate(PerMessageDeflateExtension.java:487)
	at org.eclipse.jetty.websocket.core.internal.PerMessageDeflateExtension$IncomingFlusher.handle(PerMessageDeflateExtension.java:413)
	at org.eclipse.jetty.websocket.core.internal.DemandingFlusher.process(DemandingFlusher.java:169)
	at org.eclipse.jetty.util.IteratingCallback.processing(IteratingCallback.java:243)
	at org.eclipse.jetty.util.IteratingCallback.succeeded(IteratingCallback.java:369)
	at org.eclipse.jetty.websocket.core.internal.DemandingFlusher.onFrame(DemandingFlusher.java:104)
	at org.eclipse.jetty.websocket.core.internal.PerMessageDeflateExtension.onFrame(PerMessageDeflateExtension.java:93)
	at org.eclipse.jetty.websocket.core.internal.ExtensionStack.onFrame(ExtensionStack.java:120)
	at org.eclipse.jetty.websocket.core.internal.WebSocketCoreSession.onFrame(WebSocketCoreSession.java:481)
	at org.eclipse.jetty.websocket.core.internal.WebSocketConnection.onFrame(WebSocketConnection.java:271)
	at org.eclipse.jetty.websocket.core.internal.WebSocketConnection.fillAndParse(WebSocketConnection.java:464)
	at org.eclipse.jetty.websocket.core.internal.WebSocketConnection.onFillable(WebSocketConnection.java:349)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
	at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
	at java.base/java.lang.Thread.run(Thread.java:1447)

(Feel free to ignore, I just posted it because the error said to do so)

Thank you, this is a good data point. Have you seen a related error? Can you think of anything out of the ordinary that might have triggered this error ?

I'm not really sure, I undid the code 😅 I'll make a better report if I encounter it again 👍

e/diff-by makes no assumption about the collection items, it should just work

beware of serialization on transfer though

records should transfer cleanly as long as record values (which are map-like) are serializable, no?

pretty sure transit will reject it if you don't define a custom handler, there's an example for that in the readme https://github.com/cognitect/transit-format