Modrinth cannot detect or validate Java 21 on Windows – App 0.23.1

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Schwierigkeit
3/5
Geschätzter Aufwand
1-2 Tage
Anfängerfreundlichkeit
48/100
Issue-Typ
Bug
Klarheit
Größtenteils klar
Aktivitätsstatus
Aktiv
Tech-Stack
java, rust
Bereich
desktop

Rechercherichtung

Start by inspecting the desktop app’s Java selection and detection paths, then trace the set_java_version command mentioned in the logs and how it receives the Java path. Try to reproduce with the reported Windows 11, Modrinth App 0.23.1, and Java 21 setup. Done means the app detects or validates the installation and saves its path without the reported errors.

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Beschreibung

app
Please confirm the following.
  • I checked the existing issues for duplicate problems
  • I have tried resolving the issue using the support portal
  • I have ensured my Modrinth App installation is up to date
What version of the Modrinth App are you using?

0.23.1

What operating systems are you seeing the problem on?

Windows

Describe the bug

Hello Modrinth Support,

I'm having an issue with the Modrinth App where it cannot detect or validate my Java installation. I'm trying to play a Minecraft 1.21.1 modpack using NeoForge.

My system details:

Operating System: Windows 11 (build 10.0.26200)

Modrinth App version: 0.23.1

Java distribution: Azul Zulu OpenJDK 21.0.13 (64-bit)

Minecraft version: 1.21.1

Mod loader: NeoForge

The problem:

Whenever I try to select Java in Modrinth, I receive this error:

"Could not check Java version at path ...\bin\javaw.exe"

When I use the automatic Java detection feature, it reports that no Java installations were detected, with errors mentioning that no Java DLL or Java SE Runtime Environment could be found.

Troubleshooting I have already performed:

Installed Azul Zulu OpenJDK 21 using the MSI installer.

Downloaded and extracted the ZIP version of Java 21 as a separate installation.

Tested both installations using Command Prompt. Both successfully display the Java 21 version information.

Tried selecting both javaw.exe files manually through Modrinth.

Tried placing Java in different directories, including C:\JavaTest, to rule out installation-path and permission issues.

Checked Windows security permissions and confirmed that my account owns the Java files and that the necessary Read and Execute permissions are present.

Tried running Modrinth as administrator.

Confirmed that the problem persists with Modrinth App version 0.23.1.

An additional error found in the Modrinth logs:

invalid args 'javaVersion' for command 'set_java_version': missing field 'path'

This makes me suspect there could be an issue with how the application handles Java selection or saves the Java installation path.

Java itself appears to work correctly outside Modrinth, so I would appreciate help identifying why the launcher cannot validate it.

I have an exported debug report available and can provide it for further investigation.

Thank you for your help.

modrinth-debug-2026-11-10T22-39-15-526Z.zip

Steps to reproduce

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Expected behavior

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Additional context

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