Like the others, I ran into a similar error 

Failure to find org.codehaus.groovy:groovy-all:jar:2.5.0 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]

I am also using IntelliJ IDEA.  And, like you I receive the error from the command line.  Once I include <type>pom</type> it worked.  

On Sun, Jun 3, 2018 at 7:21 PM Daniel.Sun <sunlan@apache.org> wrote:
Hi Keith,

    I'll add the `<type>pom</type>` to the doco on "Download" page.

    P.S. I'm using IntelliJ IDEA. Even if I don't add `<type>pom</type>`, it
works well too. But if I run via command line, I'll get same error as yours.


Daniel Sun
Apache Groovy committer
Blog: http://blog.sunlan.me
Twitter: @daniel_sun

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