Scalatra will not run on Windows - scalatra

Question

I have been working on a Scalatra project on a Linux environment and would now like to switch to a Windows environment. I've transferred the project folder to my Windows directory. Using Cygwyn, I cd to the Scalatra project and type
./sbt
> jetty:start
Nothing happens at this point. I have waited 10 minutes but nothing is printed to the console. I am having a hard time thinking of what might be the cause, since the exact same project works fine on Linux. Anyone have a Scalatra project working on Windows and remember whether there were any Windows-specific steps to set it up?

Answer 1

I did this on a fresh Windows 10 Professional VM in virtual box. I only allocated 1 CPU and 4 GB RAM, which may have made things unnecessarily slow. I was logged in as administrative user testvm
I always started new command prompts after modifying environment variables. All of my command prompts were run as administrator... I don't know whether that was necessary.
In general, these instructions were a good start: How to Install conscript in Windows, followed by http://scalatra.org/getting-started/first-project.html
installed the java developers kit, by visiting this page
or here
added the JDK's bin folder (C:\Program Files\Java\jdk1.8.0_131\bin) to the end of the PATH system variable
started a new command prompt and ran set to review the PATH environment variable, and ran javac –version as an additional sanity check
downloaded and installed sbt for windows. Didn't make any manual changes to the PATH at this point.
conscript (or giter8?) requires bash (and/or git?), so I installed git for windows. I did a default install, except I specified that git and "optional Linux components" should all be accessible form the windows prompt. I also added C:\Program Files\Git\bin to the PATH environment variable. I’m not sure if either or both of those tweaks are required.
downloaded the latest conscript jar. I got a warning that the download might not be safe and accepted anyway.
double clicked the conscript jar to run it. A nice graphical dialogue box came up and eventually told me that a cs.bat script had been created in C:\Users\testvm\.conscript\bin\cs.bat. 100% CPU use continued for several minutes after this and eventually I clicked the close button (X) in the upper right of the conscript installer dialogue.
When I installed conscript in another system more recently, it went quickly but I got a warning that cs.bat might not be on the system path.
ran conscript to obtain giter8. I have found that giter8 v 0.8 fails to build the skeleton project with an error like "parameters cannot contain '.'", so I specifically asked for v 0.7.2: C:\Users\testvm\.conscript\bin\cs.bat foundweekends/giter8/0.7.2
ran giter8 to install the skeleton scalatra project: C:\Users\testvm\.conscript\bin\g8.bat scalatra/scalatra-sbt
accepted all of the default parameters
turned off the windows firewall, the defender real-time protection, and started a new cmd prompt as administrator. I don’t know if any of those are necessary
ran sbt: c:\Users\testvm\my-scalatra-web-app\sbt
Going through this more recently, my-scalatra-web-app was installed into c:\Windows\System32\my-scalatra-web-app, but I was able to copy it to the top of C:\. cd'ing in there and running just sbt gave an error message, because there's a sbt file in that folder, but it's not a windows executable. So I entered "c:\Program Files (x86)\sbt\bin\sbt.bat". Subsequently, that directory was added to my PATH environment variable, so I could just enter sbt.bat
waited as components downloaded, installed and compiled
when the sbt > prompt reappeared, entered jetty:start and waited some more
eventually, the following appeared:
2017-05-09 07:31:15.101:INFO:oejs.ServerConnector:main: Started ServerConnector#bffcb98{HTTP/1.1}{0.0.0.0:8080}
2017-05-09 07:31:15.101:INFO:oejs.Server:main: Started #8698ms
Opened http://localhost:8080 in a web browser and saw Hello, world!