Flutter-intellij: "Access is allowed from event dispatch thread only" on project creation when used with the 'Install SDK' option

[lookfirst]

Please file this bug report at https://github.com/flutter/flutter-intellij/issues/new.

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What happened

(please describe what you were doing when this exception occurred)

Version information

IntelliJ IDEA 2019.2 EAP • Flutter plugin io.flutter 36.1.5 • Dart plugin 192.5281.24

Flutter 1.6.3 • channel beta • https://github.com/flutter/flutter.git
Framework • revision bc7bc94083 (5 weeks ago) • 2019-05-23 10:29:07 -0700
Engine • revision 8dc3a4cde2
Tools • Dart 2.3.2 (build 2.3.2-dev.0.0 e3edfd36b2)

Exception

Access is allowed from event dispatch thread only.

com.intellij.openapi.diagnostic.RuntimeExceptionWithAttachments: EventQueue.isDispatchThread()=false Toolkit.getEventQueue()=com.intellij.ide.IdeEventQueue@48cda804
Current thread: Thread[flutter,4,Idea Thread Group] 231686009
SystemEventQueueThread: Thread[AWT-EventQueue-0 2019.2#IU-192.5281.24 IDEA, eap:true, os:Mac OS X 10.14.5, java-version:JetBrains s.r.o 11.0.3+12-b304.2 2019.2#IU-192.5281.24 IDEA, eap:true, os:Mac OS X 10.14.5, java-version:JetBrains s.r.o 11.0.3+12-b304.2,6,Idea Thread Group] 935227418
    at com.intellij.openapi.application.impl.ApplicationImpl.assertIsDispatchThread(ApplicationImpl.java:1070)
    at com.intellij.openapi.application.impl.ApplicationImpl.assertIsDispatchThread(ApplicationImpl.java:1059)
    at com.intellij.openapi.wm.impl.FocusManagerImpl.assertDispatchThread(FocusManagerImpl.java:433)
    at com.intellij.openapi.wm.impl.FocusManagerImpl.getFocusOwner(FocusManagerImpl.java:231)
    at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.getFocusOwner(IdeFocusManagerImpl.java:102)
    at com.intellij.ui.messages.JBMacMessages.getForemostWindow(JBMacMessages.java:104)
    at com.intellij.ui.messages.JBMacMessages.showErrorDialog(JBMacMessages.java:187)
    at com.intellij.openapi.ui.Messages.showErrorDialog(Messages.java:799)
    at com.intellij.ide.util.newProjectWizard.AbstractProjectWizard.commitStepData(AbstractProjectWizard.java:236)
    at com.intellij.ide.util.newProjectWizard.AbstractProjectWizard.doNextAction(AbstractProjectWizard.java:250)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at io.flutter.module.FlutterGeneratorPeer.requestNextStep(FlutterGeneratorPeer.java:225)
    at io.flutter.actions.InstallSdkAction$InstallAction.requestNextStep(InstallSdkAction.java:142)
    at io.flutter.actions.InstallSdkAction$GitCloneAction$FlutterPrecacheCommand.onSuccess(InstallSdkAction.java:399)
    at io.flutter.actions.InstallSdkAction$GitCloneAction$InstallCommand$1.processTerminated(InstallSdkAction.java:293)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at com.intellij.execution.process.ProcessHandler$2.invoke(ProcessHandler.java:214)
    at com.sun.proxy.$Proxy20.processTerminated(Unknown Source)
    at com.intellij.execution.process.ProcessHandler.lambda$notifyTerminated$2(ProcessHandler.java:172)
    at com.intellij.execution.process.ProcessHandler$TasksRunner.execute(ProcessHandler.java:247)
    at com.intellij.execution.process.ProcessHandler.notifyTerminated(ProcessHandler.java:155)
    at com.intellij.execution.process.ProcessHandler.notifyProcessTerminated(ProcessHandler.java:151)
    at com.intellij.execution.process.BaseProcessHandler.onOSProcessTerminated(BaseProcessHandler.java:61)
    at com.intellij.execution.process.OSProcessHandler.onOSProcessTerminated(OSProcessHandler.java:168)
    at com.intellij.execution.process.BaseOSProcessHandler$1.lambda$startNotified$0(BaseOSProcessHandler.java:99)
    at com.intellij.execution.process.ProcessWaitFor.lambda$null$0(ProcessWaitFor.java:61)
    at com.intellij.util.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:208)
    at com.intellij.execution.process.ProcessWaitFor.lambda$new$1(ProcessWaitFor.java:43)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)

[stevemessick]

Thanks for the report. Unfortunately, I can't reproduce this problem. Can you give any more information about what was going on prior to this error?

Adding the output of 'flutter doctor -v' might help.

[lookfirst]

Looking at the stack trace, it appears to be something with installing the SDK

    at io.flutter.actions.InstallSdkAction$InstallAction.requestNextStep(InstallSdkAction.java:142)
    at io.flutter.actions.InstallSdkAction$GitCloneAction$FlutterPrecacheCommand.onSuccess(InstallSdkAction.java:399)
    at io.flutter.actions.InstallSdkAction$GitCloneAction$InstallCommand$1.processTerminated(InstallSdkAction.java:293)

You probably can't reproduce it locally since your system has already been setup. This was on a new install.

[lookfirst]

I had an endless stream of issues on a new install. Lots of things that needed to get fixed in flutter doctor... which is fine... but it wasn't easy. The iphone app was fairly easy, but getting the android app up and running was really hard due to a lot of outdated dependencies in the default sample project. especially around the build system.

[stevemessick]

Thanks. We'll try again with a fresh install. It is quite possible some API changes require an update to the code behind the Install SDK button.

@pq

[stevemessick]

As indicated, the problem occurs when the Install SDK button is used to download the Flutter SDK. The SDK is downloaded and the project is created correctly, but the error is shown when the project opens.

@pq probably has the best context here.