unable to build small java example via maven at the command line about packtpub-xtext-book-2nd-examples HOT 7 CLOSED

You have to run the Maven build from the org.example.parent project. You can build a single DSL using the corresponding profile.
For example, for SmallJava

mvn -f org.example.parent/pom.xml clean verify -Psmalljava

This works, I've just tried that.

from packtpub-xtext-book-2nd-examples.

There must be something else wrong. I am getting the same error message using the above command (which is very similar to what I was already doing).

from packtpub-xtext-book-2nd-examples.

Are you sure you're using the latest version of the Git repository? (currently based on Xtext 2.17.0)

Some times, cleaning the .m2/repository might help.

If this does not solve the problem, I need some more information, e.g., OS version and the full stack trace.

from packtpub-xtext-book-2nd-examples.

By the way, you're not using Maven 3.6.1 are you? That version has serious problems for Maven/Tycho projects

from packtpub-xtext-book-2nd-examples.

I removed my ~/.m2/repository directory before I opened the issue but I suspect there may have been unresolved issues that I missed because I just repeated that and after noticing a good number of warning/retries (such as the one below), it was eventually successful.

[WARNING] Some attempts to read artifact osgi.bundle,org.eclipse.xtext.generator,2.17.0.v20190304-0626 failed:
[WARNING] An error occurred while transferring artifact canonical: osgi.bundle,org.eclipse.xtext.generator,2.17.0.v20190304-0626 from repository http://download.eclipse.org/releases/2019-03/201903201000:
[WARNING] Retry another mirror:
[WARNING] Unable to connect to repository http://mirror.cc.vt.edu/pub/eclipse/releases/2019-03/201903201000/plugins/org.eclipse.xtext.generator_2.17.0.v20190304-0626.jar

from packtpub-xtext-book-2nd-examples.

Yes, sometimes p2 mirrors might be flaky. When that happens, you might want to disable mirrors passing this command line property in the build -Dtycho.disableP2Mirrors=true.

from packtpub-xtext-book-2nd-examples.

Thank you.

from packtpub-xtext-book-2nd-examples.