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Michiel de Mare
Michiel de Mare

Reputation: 42420

Where does JRuby look for scripts?

Running the command jruby -S spec gives the following error

No such file, directory, or command -- spec

The location of spec is /usr/bin, which is in the path. Rspec is installed. MRI Ruby can find the script. JRuby can find the rspec gem. So what goes wrong?

Upvotes: 2

Views: 1574

Answers (2)

Sébastien Le Callonnec
Sébastien Le Callonnec

Reputation: 26753

With the latest version of JRuby, when using the -S option, JRuby looks for the file in 3 different locations:

  1. In the current directory,
  2. In $JRUBY_HOME/bin
  3. On the PATH (not LOAD_PATH)

This can be verified by adding a script (here called test_it that merely prints hello) in /tmp:

sebastien@greystones:~$ jruby -v 
jruby 1.6.6.dev (ruby-1.8.7-p357) (2012-01-22 9099561) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_30) [linux-amd64-java]
sebastien@greystones:~$ jruby -S test_it
jruby: No such file or directory -- test_it (LoadError)
sebastien@greystones:~$ export PATH=/tmp:$PATH
sebastien@greystones:~$ jruby -J-Djruby.debug.scriptResolution=true -S test_it
Found: /tmp/test_it
hello

Here the debug.scriptResolution option is used to tell us where the script has been found.

Upvotes: 2

codefinger
codefinger

Reputation: 10318

JRuby will try to load scripts from directories on the classpath. You can see what these are by running:

jruby -e "puts $:"

On the command line you can modify the $LOAD_PATH with the -I option. Or add a library with the -r option. For example:

jruby -I/usr/bin spec

Here is some more info on loadpath and classpath:

http://kenai.com/projects/jruby/pages/ClasspathAndLoadPath

Hope that helps

Upvotes: 2

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