Context

When running an Android build, you may encounter a failure similar to the following:

FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':app:lintVitalReportRelease'.
> Could not resolve all dependencies for configuration ':app:releaseCompileClasspath'.
   > Could not resolve org.jetbrains.kotlin:kotlin-stdlib-common:1.9.23.
      > Repository maven is disabled due to earlier error below:
         > Could not resolve com.google.mlkit:barcode-scanning:17.1.0.
            > Could not get resource 'https://oss.sonatype.org/content/repositories/...
               > Could not GET 'https://oss.sonatype.org/content/repositories/...
                 Received status code 504 from server: Gateway Time-out

This error occurs when your Gradle configuration references the legacy Sonatype OSS repository (oss.sonatype.org), which has been permanently shut down and is no longer available.

Answer

This is not a build infrastructure issue — the root cause is that the Sonatype OSSRH legacy repository (oss.sonatype.org) has been deprecated and decommissioned. Requests to this server now return a permanent 404 Not Found response. You can read the official announcement here: https://central.sonatype.org/pages/ossrh-eol/

To resolve this, update your root Gradle file to remove references to the dead repository and ensure the correct repositories are used:

1. Open your root-level build.gradle file.

2. Look for any explicit references to oss.sonatype.org inside your buildscript or allprojects blocks, for example:

   maven { url "https://oss.sonatype.org/content/repositories/..." }

3. Delete any such lines referencing oss.sonatype.org.

4. Make sure google() and mavenCentral() are present and listed at the top of your repository blocks:

   repositories {
       google()
       mavenCentral()
       // other repositories...
   }

Note: The broken repository URL may sometimes be hidden inside a third-party library's internal configuration rather than your own code. In that case, adding the repository block override in your root Gradle file will intercept and effectively ignore the dead repository.