Previewer doesn`t load

[baliross]

Environment

• Arch Linux 6.14.11
• JetBrains Rider 2025.1.3
• AvaloniaRider 1.5.4
• .NET 9.0
• C#13

Problem

If I use any Avalonia template to create an empty project, build a project, and check the preview window, it loads endlessly. When I click on the "Restart previewer" button, the window turns black (to clarify, it becomes a text field), and nothing is written in the Avalonia log (which should appear when I click the "Show Log" button)

Screenshot

[ForNeVeR]

Could you check if it says anything in the IDE log file? There could be some exceptions (normally prefixed with the word SEVERE).

[baliross]

Could you check if it says anything in the IDE log file? There could be some exceptions (normally prefixed with the word SEVERE).

2025-07-02 21:27:00,975 [2229468] SEVERE - #c.j.r.e.NetSdkInstaller - Can't update rider sdks metadata 2025-07-02 21:27:00,977 [2229470] SEVERE - #c.j.r.e.NetSdkInstaller - JetBrains Rider 2025.1.3 Build #RD-251.26094.147 2025-07-02 21:27:00,977 [2229470] SEVERE - #c.j.r.e.NetSdkInstaller - JDK: 21.0.7; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o. 2025-07-02 21:27:00,977 [2229470] SEVERE - #c.j.r.e.NetSdkInstaller - OS: Linux 2025-07-02 21:27:00,977 [2229470] SEVERE - #c.j.r.e.NetSdkInstaller - Last Action: RiderNewSolution

[ForNeVeR]

This doesn't seem related. Are there any logs from the plugin? E.g. it should log something during the process startup. E.g. these lines: https://github.com/ForNeVeR/AvaloniaRider/blob/7f8443ccd708e9bd2a650e92845251d823950a79/src/rider/main/kotlin/me/fornever/avaloniarider/previewer/AvaloniaPreviewerProcess.kt#L162-L166

[baliross]

There's nothing like this in the IDE log, and I can't view the plugin log because nothing is displayed when I click the "Show Log" button in the previewer window

[ForNeVeR]

Meaning it probably failed before even having a chance to start the process. Can you attach the idea.log somewhere? Mind it might contain private information, though.

[baliross]

To begin with, I grep'ed avaloniarider lines from IDE log. If this doesn't help, I'll attach the full log. https://pastebin.com/Y7FBLTWQ

[baliross]

I will attach the full log in advance.

idea.log

[ForNeVeR]

Hmm, according to the logs, it terminates all the previewer sessions immediately after they are started, but I'm not sure why would that happen. Normally it happens while you build the project, but it isn't the case here.

[baliross]

I have tried reinstalling the IDE and plugin, but it has not worked. If there is no solution at the moment, are there any suggestions?

[ForNeVeR]

Sadly, no any other clues so far. I am planning to add more diagnostics (especially around cases when we suppress the previewer during an ongoing build).

But generally, a problem without clear reproducer — most luck you'll have debugging this yourself. Try checking how the AvaloniaPreviewerSessionController behaves around lines like these and these — I expect it to start the process in there somewhere, but it doesn't happen because something cancels the whole session.

You can also try to reduce the case by checking on a newly created project from template, or trying on a different computer / with default IDE settings (in case there's something in the IDE settings that causes this behavior).

[baliross]

I decided to try a few other linux distributions and check if the plugin works there. I installed the IDE using yay. The symptoms are the same. Could it be a hardware issue?

[ForNeVeR]

I doubt it is a hardware issue. Also, while "yay" is not a packaging utility I am familiar with, I also don't think the way you install the IDE could be related to this particular problem.

[colejohnson66]

I've had this happen before. Sometimes hitting refresh a few times fixes it, but typically not. This only started happening with Avalonia 11. Our old internal tools running 0.10 still load fine.

I have gotten IDE errors that are always:

Socket error while session is still alive

java.net.SocketException: Connection reset
	at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:318)
	at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:346)
	at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:796)
	at java.base/java.net.Socket$SocketInputStream.read(Socket.java:1099)
	at java.base/java.io.DataInputStream.readFully(DataInputStream.java:208)
	at java.base/java.io.DataInputStream.readFully(DataInputStream.java:179)
	at me.fornever.avaloniarider.bson.BsonStreamReader.readBytes(BsonStreamReader.kt:25)
	at me.fornever.avaloniarider.bson.BsonStreamReader.readMessage(BsonStreamReader.kt:29)
	at me.fornever.avaloniarider.previewer.AvaloniaPreviewerSession.processSocketMessages(AvaloniaPreviewerSession.kt:64)
	at me.fornever.avaloniarider.previewer.AvaloniaPreviewerSessionController$executePreviewerAsync$sessionJob$1.invokeSuspend(AvaloniaPreviewerSessionController.kt:293)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at kotlinx.coroutines.internal.SoftLimitedDispatcher$Worker.run(SoftLimitedDispatcher.kt:130)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:613)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:1183)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:778)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:765)

[ForNeVeR]

This happens when the previewer process dies. Logs from the previewer process would help.