ViewHierarchyExceptionHandler calls View methods on non-UI thread

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#2,443 opened on Sep 19, 2025 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 48/100

Issue type: Bug
Clarity: Clearly specified
Activity status: Stale
Tech stack: java
Domain: testing-qa

Research direction

Start with ViewHierarchyExceptionHandler.java, especially handleSafely and dumpFullViewHierarchyToFile, and compare the failing stack with Espresso's UI-thread behavior. Use ArchivedTabsDialogCoordinatorTest.testContentDescription as the reported reproduction; done means view-hierarchy error handling no longer calls View methods from the background thread.

Written by the indexing model from the issue text.

Description

This stack comes up in failing chrome tests from time to time:

C 11:28:54.816   87.729s Main  java.lang.AssertionError: Class was initialized on the UI thread, but current operation was performed on a background thread: Thread[Instr: org.chromium.base.test.BaseChromiumAndroidJUnitRunner,5,main]
C 11:28:54.816   87.730s Main  	at org.chromium.base.ThreadUtils$ThreadChecker.assertOnValidThreadHelper(ThreadUtils.java:97)
C 11:28:54.816   87.730s Main  	at org.chromium.base.ThreadUtils$ThreadChecker.assertOnValidThread(ThreadUtils.java:71)
C 11:28:54.816   87.730s Main  	at org.chromium.base.UserDataHost.checkThreadAndState(UserDataHost.java:64)
C 11:28:54.816   87.730s Main  	at org.chromium.base.UserDataHost.getUserData(UserDataHost.java:96)
C 11:28:54.816   87.730s Main  	at org.chromium.content.browser.webcontents.WebContentsImpl.getOrSetUserData(WebContentsImpl.java:1042)
C 11:28:54.816   87.730s Main  	at org.chromium.content.browser.input.ImeAdapterImpl.fromWebContents(ImeAdapterImpl.java:253)
C 11:28:54.816   87.730s Main  	at org.chromium.content_public.browser.ImeAdapter.fromWebContents(ImeAdapter.java:32)
C 11:28:54.816   87.730s Main  	at org.chromium.components.embedder_support.view.ContentView.onCreateInputConnection(ContentView.java:360)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.util.HumanReadables.describe(HumanReadables.java:247)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.util.HumanReadables.getViewHierarchyErrorMessage(HumanReadables.java:116)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.util.HumanReadables.getViewHierarchyErrorMessage(HumanReadables.java:73)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.base.ViewHierarchyExceptionHandler.dumpFullViewHierarchyToFile(ViewHierarchyExceptionHandler.java:96)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.base.ViewHierarchyExceptionHandler.handleSafely(ViewHierarchyExceptionHandler.java:65)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.base.ViewHierarchyExceptionHandler.handleSafely(ViewHierarchyExceptionHandler.java:38)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.base.DefaultFailureHandler$TypedFailureHandler.handle(DefaultFailureHandler.java:158)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:120)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.ViewInteraction.waitForAndHandleInteractionResults(ViewInteraction.java:385)
C 11:28:54.816   87.730s Main  	at androidx.test.espresso.ViewInteraction.check(ViewInteraction.java:366)
C 11:28:54.816   87.730s Main  	at org.chromium.chrome.browser.tasks.tab_management.ArchivedTabsDialogCoordinatorTest.testContentDescription(ArchivedTabsDialogCoordinatorTest.java:754)

Espresso normally jumps to the UI thread to interact with Views, but I think that got missed for ViewHierarchyExceptionHandler. It should do a thread hop before accessing Views.

Dominant language: Java
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