“Unable to load Maven meta-data” error from ForgeGradle on Mac OSX?

I am attempting to set up Eclipse and Minecraft Forge with Gradle on Mac OS X so I can try my hand at modding. Whenever I run either of the following commands, Gradle returns the same error:

./gradlew genEclipseRuns
./gradlew setupDecompWorkspace

Error:

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'forge-1.12.2-14.23.5.2854-mdk'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve net.minecraftforge.gradle:ForgeGradle:3.+.
     Required by:
         project :
      > Failed to list versions for net.minecraftforge.gradle:ForgeGradle.
         > Unable to load Maven meta-data from https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml.
            > Could not get resource 'https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml'.
               > Could not GET 'https://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/maven-metadata.xml'.
                  > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 4s

I’ve found a number of issues on the web that seem similar to this, namely this one, but I don’t really understand the answer. How can I get this to work? Thanks in advance for your feedback!

Some details that might be relevant:

I’m running java 1.8.0_65.
The Forge version is “forge-1.12.2-14.23.5.2854-mdk”, which is the recommended mdk for MC 1.12.2.
I’m using Gradle 6.4.1.

Answer

Thanks for your help! I seem to have found the problem.

For others who are wondering, changing the maven url from https to http in the repositories of forge’s build.gradle solved the error I posted above. However, I kept running into similar errors that seemed to be a result of forge no longer supporting 1.12.2. I deleted the old files and started over with 1.15.2, and now everything runs without issue.

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Answer