How can I debug an sbt-coursier hang-on-startup issue? - scala

Question

How can I debug an sbt-coursier hang-on-startup issue? (Note, I'm also using sbt-assembly.)
I would really like to use sbt-coursier, but it's just not working for me. Platform is Windows 10, I hope that's not why. What's odd is that even though sbt-coursier supposedly no longer uses the dreadful .sbt.ivy.lock file, I still see it appear when I am using sbt-coursier. It's almost as though sbt-couriser is waiting on it ...forever..., but that doesn't make sense to me, because I thought in recent versions sbt-coursier completely moved away from using .sbt.ivy.lock.
When I try to use the sbt-cousier plugin, my sbt session hangs during startup.
// This is file: ~/.sbt/1.0/plugins/build.sbt
addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.1.0-M10")
// console output
[info] Loading settings for project global-plugins from build.sbt,idea.sbt,plugins.sbt ...
[info] Loading settings for project global-plugins from idea6673.sbt ...
[info] Loading global plugins from C:\Users\me\.sbt\1.0\plugins
[info] Updating ProjectRef(uri("file:/C:/Users/me/.sbt/1.0/plugins/"), "global-plugins")...
[info] Done updating.
[warn] There may be incompatibilities among your library dependencies; run 'evicted' to see detailed eviction warnings.
[info] Loading settings for project myapp-build from assembly.sbt ...
If I go back to not using sbt-coursier, everything is fine.
// This is file: ~/.sbt/1.0/plugins/build.sbt
// addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.1.0-M10")
// console output
[info] Loading settings for project global-plugins from build.sbt,idea.sbt,plugins.sbt ...
[info] Loading settings for project global-plugins from idea62602.sbt ...
[info] Loading global plugins from C:\Users\me\.sbt\1.0\plugins
[info] Updating ProjectRef(uri("file:/C:/Users/me/.sbt/1.0/plugins/"), "global-plugins")...
[info] Done updating.
[info] Loading settings for project myapp-build from assembly.sbt ...
[info] Loading project definition from C:\Users\me\Documents\C\IdeaProjects\MyApp\project
[info] Updating ProjectRef(uri("file:/C:/Users/me/Documents/C/IdeaProjects/MyApp/project/"), "myapp-build")...
[info] Done updating.
[warn] There may be incompatibilities among your library dependencies; run 'evicted' to see detailed eviction warnings.
[info] Loading settings for project myapp from build.sbt ...
[info] Set current project to myapp (in build file:/C:/Users/me/Documents/C/IdeaProjects/MyApp/)
[IJ]sbt:myapp>