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Intermittent Class Loading Issues with Java Core Packages in VSCode #3797

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Intermittent Class Loading Issues with Java Core Packages in VSCode#3797
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snjeza
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bugcode action
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End October 2024

Description

@Laceprndpm
Laceprndpm
opened on Oct 3, 2024

[provide a description of the issue]

Environment
  • Operating System:Win 11
  • JDK version:JDK 17
  • Visual Studio Code version:1.93.1
  • Java extension version:v1.35.1
Steps To Reproduce

1.While using the Java extension in VSCode, I encountered an issue where the classes from the Java core packages (such as String) cannot be loaded correctly, which leads to malfunctioning autocomplete features. However, even though these core package classes fail to load, I am still able to use methods from the String class, such as String.length() and String.substring(), which work properly and provide autocomplete. Moreover, this issue does not occur every time.
issue

[Please attach a sample project reproducing the error]
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Current Result
Expected Result
Additional Informations

Activity

  1. rgrunber commented on Oct 3, 2024

    @rgrunber
    rgrunber
    on Oct 3, 2024
    Member

    Seems really similar to #3793 .

    Update: Ok there's some slight differences. In that issue, basic JDK classes also didn't resolve. Here they seem to be resolving, just completion isn't showing them at all.

  2. rgrunber commented on Oct 3, 2024

    @rgrunber
    rgrunber
    on Oct 3, 2024
    Member

    Some things to try :

    • At the bottom left corner, there should be a Java status icon. Is it in the "Ready" state ?
      image
    • At the bottom right corner there should be a Java language mode icon. Does it clearly indicate a Java execution environment version ?
      image
    • Are there any errors in the problems view ? Maybe relating to the import of the project ?
    • If you go to the command palette and call the command Java: Open Java Language Server Log File, are there any errors/something strange being logged around the time this occurs ?
    • If you bring up the workspace symbol search (ctrl + t or Go -> Go To Symbol In Workspace), are you able to search for the "String" type, or any other types on the classpath ?

  3. Laceprndpm commented on Oct 5, 2024

    @Laceprndpm
    Laceprndpm
    on Oct 5, 2024
    Author
    • Yes,Regardless of whether it is working normally or abnormally, the status in the bottom left is always 'Ready'.
      3499AD50172C8CDC156BEBDEFDA30A8A
    • Yes.
      73EF408DBF39CFD4AFFBAE138A82B621
    • Considering that I just started learning programming, the only package I imported is algs4.jar, and I don't believe this would cause import errors. To be safe, I deleted this package, but I still can't load the core packages.
      FA7667B51E83C40B367890101405F9E4
    • In the log file, I did not see any instances of 'error' or 'warning'.
    • When I open VSCode, the autocomplete feature works normally and can load core packages. However, once I perform any action, such as switching to another program (like Firefox) or pressing Ctrl + T, the autocomplete feature becomes inactive and is no longer usable.So,I didn't find anything.
      1EEDB5712EBCE2D27ECB88970737670B
      I used ChatGPT for translation, so there may be unclear expressions.
      If you need any further clarification or additional information, please feel free to reach out to me. I appreciate your understanding!

  4. fp024 commented on Oct 6, 2024

    @fp024
    fp024
    on Oct 6, 2024

    @rgrunber

    In the past, I don’t recall experiencing import suggestion issues, so I checked older versions.

    Checked import suggestion functionality with Map, List, Set, SimpleDateFormat, LocalDateTime, etc.

    Method to check suggestion functionality:

    • Turn off and restart VSCode. Once the project is fully loaded, check the import suggestions. Repeat this process about 10 times to ensure there are no issues.
    • I did not execute Clean Java Language Server Workspace.
    v1.22.0-work-well-mute.mp4
    v1.22.1-dose-not-work-mute.mp4

    Versions where there are no issues with Java standard library import suggestions:

    • v1.18.0
    • v1.20.0
    • v1.21.0
    • v1.22.0

    Versions where Java standard library import suggestions start to occasionally fail:

    • v1.22.1
    • v1.23.0
    • v1.24.0

    💡 It seems that the regression issue might have started occurring when upgrading from v1.22.0 to v1.22.1.

  5. snjeza commented on Oct 6, 2024

    @snjeza
    snjeza
    on Oct 6, 2024
    Collaborator

    @fp024 Could you, please, check https://github.com/snjeza/vscode-test/raw/refs/heads/master/java-1.37.0.vsix ?

  6. fp024 commented on Oct 6, 2024

    @fp024
    fp024
    on Oct 6, 2024

    @snjeza

    I manually installed the file from the link and confirmed it.
    I checked it about 10 times, and the import suggestion issues did not occur. 😊👍

  7. snjeza commented on Oct 6, 2024

    @snjeza
    snjeza
    on Oct 6, 2024
    Collaborator

    This is an upstream JDT issue. JDT sometimes doesn't initialize indexes properly.
    eclipse-jdtls/eclipse.jdt.ls#3296 fixes it.

  8. rgrunber commented on Oct 7, 2024

    @rgrunber
    rgrunber
    on Oct 7, 2024
    Member

    @snjeza , do you know when this started happening upstream ? Are they aware of this ?

  9. rgrunber
    added
    bug
    code action
    on Oct 7, 2024

  10. snjeza commented on Oct 7, 2024

    @snjeza
    snjeza
    on Oct 7, 2024
    Collaborator

    The issue doesn't happen in Eclipse because of https://github.com/eclipse-jdt/eclipse.jdt.ui/blob/8f8fafd02eac6cf56c98d5941ab5df1a4460eb3e/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/JavaPlugin.java#L419

  11. rgrunber commented on Oct 7, 2024

    @rgrunber
    rgrunber
    on Oct 7, 2024
    Member

    So it's specifically :

    https://github.com/eclipse-jdt/eclipse.jdt.core/blob/55d99cde490111cad4874bc05eec03397ca5bc0e/org.eclipse.jdt.core/model/org/eclipse/jdt/core/JavaCore.java#L4798-L4809
    https://github.com/eclipse-jdt/eclipse.jdt.core/blob/55d99cde490111cad4874bc05eec03397ca5bc0e/org.eclipse.jdt.core/model/org/eclipse/jdt/core/JavaCore.java#L4816-L4819

    ?

  12. rgrunber
    added this to IDE Cloudaptorson Oct 8, 2024
  13. rgrunber
    assigned
    snjeza
    on Oct 8, 2024
  14. rgrunber
    moved this to 📝 In Progress in IDE Cloudaptorson Oct 8, 2024
  15. rgrunber
    moved this from 📝 In Progress to 👀 In review in IDE Cloudaptorson Oct 8, 2024
  16. rgrunber
    self-assigned this
    on Oct 9, 2024
  17. rgrunber
    added this to Java Toolingon Oct 9, 2024
  18. rgrunber
    assigned
    snjeza
    and unassigned
    snjeza
    and
    rgrunber
    on Oct 9, 2024
  19. rgrunber
    removed this from IDE Cloudaptorson Oct 9, 2024
  20. rgrunber
    added this to the End October 2024 milestone on Oct 16, 2024
  21. Laceprndpm
    closed this as completedon Oct 16, 2024
  22. github-project-automation
    moved this to Done in Java Toolingon Oct 16, 2024

  23. Laceprndpm commented on Oct 16, 2024

    @Laceprndpm
    Laceprndpm
    on Oct 16, 2024
    Author

    Thanks! After installing the file, the import suggestion issues no longer occur. This has been very helpful!

  24. mozhuanzuojing commented on Oct 16, 2024

    @mozhuanzuojing
    mozhuanzuojing
    on Oct 16, 2024
    Contributor

    The long-standing problem has finally been solved

  25. fp024 commented on Oct 17, 2024

    @fp024
    fp024
    on Oct 17, 2024

    Studying Java with vscode-java has become fun again. Thanks for the support. 👍

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