Flutter doctor is happy with just JRE, but builds fail without JDK

While trying to fix an issue with flutter (Could not reserve enough space for 1572864KB object heap) I uninstalled 32bit java and installed 64bit. I picked the JRE isntead of JDK and flutter doctor was happy; but builds failed claiming I needed the JDK:

Installing the JDK fixed the issue. It would be good if flutter doctor could check this.

Fully agree! That would be great!

Is this still relevant? I am not able to reproduce

flutter doctor -v

[√] Flutter (Channel unknown, 2.3.0-17.0.pre.445, on Microsoft Windows [Version 10.0.19042.985], locale en-US)
    • Flutter version 2.3.0-17.0.pre.445 at C:\use\flutter\clone\flutter
    • Upstream repository unknown
    • Framework revision de0a5e086d (5 hours ago), 2021-06-23 04:01:02 -0400
    • Engine revision 40edba381e
    • Dart version 2.14.0 (build 2.14.0-236.0.dev)

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\ahmed_ashour\AppData\Local\Android\sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: C:\Program Files\Java\jre1.8.0_291\bin\java
    • Java version Java(TM) SE Runtime Environment (build 1.8.0_291-b10)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.10.2)
    • Visual Studio at C:\Program Files (x86)\Microsoft Visual Studio\2019\Community
    • Visual Studio Community 2019 version 16.10.31410.357
    • Windows 10 SDK version 10.0.19041.0

[!] Android Studio (version 4.2.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    X Unable to find bundled Java version.
    • Try updating or re-installing Android Studio.

[√] IntelliJ IDEA Community Edition (version 2021.1)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2021.1.1
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart

[√] IntelliJ IDEA Ultimate Edition (version 2021.2)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 212.4037.9
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart

[√] VS Code (version 1.57.1)
    • VS Code at C:\Users\ahmed_ashour\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension can be installed from:
       https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[√] Connected device (2 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.19042.985]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 91.0.4472.114

! Doctor found issues in 1 category.

logs

C:\use\delme\mytest>flutter clean
Deleting build...                                                   10ms
Deleting .dart_tool...                                              24ms
Deleting .packages...                                                1ms
Deleting Generated.xcconfig...                                       0ms
Deleting flutter_export_environment.sh...                            0ms

C:\use\delme\mytest>flutter run
Running "flutter pub get" in mytest...                             728ms
Launching lib\main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...             19.6s
This app is linked to the debug service: ws://127.0.0.1:56938/wGwiVoRkmjE=/ws
Debug service listening on ws://127.0.0.1:56938/wGwiVoRkmjE=/ws

 Running with sound null safety

  To hot restart changes while running, press "r" or "R".
For a more detailed help message, press "h". To quit, press "q".

An Observatory debugger and profiler on Chrome is available at: http://127.0.0.1:56938/wGwiVoRkmjE=
The Flutter DevTools debugger and profiler on Chrome is available at:
http://127.0.0.1:63509?uri=http%3A%2F%2F127.0.0.1%3A56938%2FwGwiVoRkmjE%3D

@asashour

@asashour I think the error only occurs when building for Android (I think that's the only target that requires Java).

Still reproducible on master (0a140c6) using Azul Zulu JRE 17.40.19.

A solution might be to check for a javac binary¹ instead or in addition to the java binary during the Android toolchain validation (code).

Any other JDK-specific file would probably work as well. ↩

The triaged-tool label is irrelevant if there is no team-tool label or fyi-tool label.

Resolve issue flutter#10351: Detect JRE-only Java installations (miss…

fix: resolve issue flutter#10351 by checking for javac (JDK) in docto…

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Flutter doctor is happy with just JRE, but builds fail without JDK #10351

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Flutter doctor is happy with just JRE, but builds fail without JDK #10351

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ronlobo commented on May 27, 2017

asashour commented on Jun 23, 2021

DanTup commented on Jul 7, 2021

andrewkolos commented on Apr 12, 2023

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flutter-triage-bot commented on Jun 27, 2025

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