Gradle Could not HEAD https://..pom > peer not authenticated

Question

When you upgrade from gradle 2.0 to 2.1, you may see following error.

Could not HEAD 'https://jcenter.bintray.com/de/undercouch/gradle-download-task/1.0/gradle-download-task-1.0.pom'.
         > peer not authenticated

To be fair, this error is not due to gradle. It is problem of how java handles ssl connections.

I am using following java version.

java -version
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) 64-Bit Server VM (build 24.0-b56, mixed mode)

You can use following answer to import security certificate your java installation.

I do not care about https downloads, http is enough for me. So see my answer.

Answer 1

Change your repository syntax to one of the following

repositories {
    jcenter {
        url "http://jcenter.bintray.com/"
    }
}


repositories {
    maven  {
        url "http://repo1.maven.org/maven2"
    }
}

Current (2.1) gradle docs claims that

Warning: Be aware that the central Maven 2 repository is HTTP only 
and HTTPS is not supported. If you need a public HTTPS enabled 
central repository, you can use the JCenter public repository 
(see Section 51.6.3, “Maven JCenter repository”).

I think maven central went for https. If I use following syntax.

repositories {
    mavenCentral()
}

I get following error.

D:\tools\gradle-2.1-bin\bin\gradle.bat -q

FAILURE: Build failed with an exception.

• What went wrong: A problem occurred configuring root project 'XXXX'.

  Could not resolve all dependencies for configuration ':classpath'. Could not resolve de.undercouch:gradle-download-task:1.0. Required by: :XXXX:unspecified Could not HEAD 'https://repo1.maven.org/maven2/de/undercouch/gradle-download-task/1.0/gradle-download-task-1.0.pom'. peer not authenticated

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.