Question

* Download JRuby 1.20. (zip file) * Extract the zip into C:\JRuby120 * Edit sytem 'environment variables': * Add JRUBY_HOME -> point it to C:\JRuby120 * Modify the PATH environment variable to point to C:\JRuby120\bin;  

After all this, I open up cmd.exe and type jruby

->’The system cannot find the path specified’

What did I do wrong?

I removed echo_off from C:\JRuby120\bin\jruby.bat, C:\JRuby120\bin_jrubyvars.bat and C:\JRuby120\bin_jrubyvmopts.bat and invoked jruby from cmd.exe. This was the output:

C:\>rem ---------------------------------------------------------------------------   C:\>rem jruby.bat - Start Script for the JRuby Interpreter   C:\>rem  C:\>rem for info on environment variables, see internal batch script _jrubyvars.bat   C:\>setlocal  C:\>rem Sometimes, when jruby.bat is being invoked from another BAT file,   C:\>rem C:\JRuby120\bin\ is incorrect and points to the current dir, not to JRuby's bin dir,   C:\>rem so we look on the PATH in such cases.   C:\>IF EXIST 'C:\JRuby120\bin\_jrubyvars.bat' (set FULL_PATH=C:\JRuby120\bin\ )  ELSE (set FULL_PATH=C:\JRuby120\bin\ )   C:\>call 'C:\JRuby120\bin\_jrubyvars.bat'    C:\>rem Environment Variable Prequisites:   C:\>rem  C:\>rem   JRUBY_OPTS    (Optional) Default JRuby command line args.   C:\>rem  C:\>rem   JAVA_HOME     Must point at your Java Development Kit installation.   C:\>rem  C:\>rem ----- Save Environment Variables That May Change --------------------------   C:\>set _CLASSPATH=.;   C:\>set _CP=   C:\>set _JRUBY_CP=   C:\>set JRUBY_BAT_ERROR=0   C:\>rem ----- Verify and Set Required Environment Variables -----------------------   C:\>if not 'C:\Program Files\Java\jdk1.6.0_11\bin' == '' goto gotJava   C:\>set JRUBY_HOME=C:\JRuby120\bin\..   C:\>rem ----- Prepare Appropriate Java Execution Commands -------------------------   C:\>if not '' == '' goto gotCommand   C:\>set _JAVA_COMMAND=   C:\>set JAVA_COMMAND=java   C:\>if not 'Windows_NT' == 'Windows_NT' goto noTitle   C:\>rem set _STARTJAVA=start 'JRuby' 'C:\Program Files\Java\jdk1.6.0_11\bin\bin\java'   C:\>set _STARTJAVA=C:\Program Files\Java\jdk1.6.0_11\bin\bin\java   C:\>goto gotTitle   C:\>rem ----- Set up the VM options   C:\>call 'C:\JRuby120\bin\_jrubyvmopts'    C:\>set _MEM=-Xmx500m   C:\>if not defined JAVA_MEM goto memOptDone   C:\>set _STK=-Xss1024k   C:\>if not defined JAVA_STACK goto stackOptDone   C:\>set _VM_OPTS=   C:\>set _RUBY_OPTS=   C:\>set _DFLT_VM_OPTS=   C:\>set _JAVA_VM=-client   C:\>set SAFE_JAVA_HOME=C:\Program Files\Java\jdk1.6.0_11\bin   C:\>set SAFE_JAVA_HOME=C:\Program Files\Java\jdk1.6.0_11\bin   C:\>rem  C:\>rem Can you believe I'm rewriting batch arg processing in batch files because batch   C:\>rem file arg processing sucks so bad? Can you believe this is even possible?   C:\>rem http://support.microsoft.com/kb/71247   C:\>rem Escape any quotes. Use _S for ', _D for ', and _U to escape _ itself.   C:\>rem We have to escape _ itself, otherwise file names with _S and _D   C:\>rem will be converted to to wrong ones, when we un-escape. See JRUBY-2821.   C:\>set _ARGS=   C:\>if not defined _ARGS goto vmoptsDone   C:\>set _VM_OPTS= -client -Xmx500m -Xss1024k    C:\>set _DFLT_VM_OPTS=   C:\>set _MEM=   C:\>set _STK=   C:\>set _ARGS=   C:\>set _VAL=   C:\>set _CMP=   C:\>set _CMP1=   C:\>set _JAVA_VM=   C:\>set _RUNJAVA='C:\Program Files\Java\jdk1.6.0_11\bin\bin\java'   C:\>rem ----- Set Up The Boot Classpath ----------------------------------------   C:\>for %i in ('C:\JRuby120\bin\..\lib\jruby*.jar') do @call :setjrubycp %i   C:\>if not '' == '' goto addjrubycp   C:\>set JRUBY_CP=C:\JRuby120\bin\..\lib\jruby.jar   C:\>goto :EOF   C:\>for %i in ('C:\JRuby120\bin\..\lib\bsf*.jar') do @call :setjrubycp %i   C:\>if not 'C:\JRuby120\bin\..\lib\jruby.jar' == '' goto addjrubycp   C:\>set JRUBY_CP=C:\JRuby120\bin\..\lib\jruby.jar;C:\JRuby120\bin\..\lib\bsf.jar   C:\>goto :EOF   C:\>rem ----- Set Up The System Classpath ----------------------------------------   C:\>for %i in ('C:\JRuby120\bin\..\lib\*.jar') do @call :setcp %i   C:\>if not '' == '' goto add   C:\>set CP=C:\JRuby120\bin\..\lib\bsf.jar   C:\>goto :EOF   C:\>if not 'C:\JRuby120\bin\..\lib\bsf.jar' == '' goto add   C:\>set CP=C:\JRuby120\bin\..\lib\bsf.jar;C:\JRuby120\bin\..\lib\jruby.jar   C:\>goto :EOF   C:\>if not 'C:\JRuby120\bin\..\lib\bsf.jar;C:\JRuby120\bin\..\lib\jruby.jar' == '' goto add   C:\>set CP=C:\JRuby120\bin\..\lib\bsf.jar;C:\JRuby120\bin\..\lib\jruby.jar;C:\JRuby120\bin\..\lib\profile.jar   C:\>goto :EOF   C:\>goto :EOF   C:\>if 0 == 0 'C:\Program Files\Java\jdk1.6.0_11\bin\bin\java'  -client -Xmx500m -Xss1024k  -Xbootclasspath/a:'C:\JRuby120\bin\..\lib\jruby.jar;C:\JRuby120\bin\..\lib\bsf.jar' -classpath 'C:\JRuby120\bin\..\lib\bsf.jar;C:\JRuby120\bin\..\lib\jruby.jar;C:\JRuby120\bin\..\lib\profile.jar;.;' -Djruby.home='C:\JRuby120\bin\..' -Djruby.lib='C:\JRuby120\bin\..\lib' -Djruby.shell='cmd.exe' -Djruby.script=jruby.bat org.jruby.Main     C:\>set E=3   C:\>call 'C:\JRuby120\bin\_jrubycleanup'  

Answer 1

Well, that’s what you’re supposed to do. Go to the command line and enter echo %PATH% and make sure your jruby bin directory is on there.

---

EDIT:

Ignore the above, that’s not the error you’d get for jruby not being in the path. The ‘The system cannot find the path specified’ error is because a path doesn’t exist, most likely it’s the path to your Java JDK. Run echo %JAVA_HOME%. Make sure that path is correct. If you don’t have the Java JDK, you can download it here.

---

EDIT 2:

Having seen the output of jruby.bat, the problem appears to either be in finding _jrubyvars.bat, or finding something called within it. The only thing it calls is _jrubyvmopts.bat, which doesn’t call anything else. Make sure that C:\JRuby120\bin\_jrubyvars.bat and C:\JRuby120\bin\_jrubyvmopts.bat exist, although I can’t see a reason why they shouldn’t. If they both exist, then the next step would be to remove the @echo off lines from each of them and see if we can find exactly where the bad call is taking place.

---

EDIT 3:

Having seen all that output, it looks like JAVA_HOME is set to ‘C:\Program Files\Java\jdk1.6.0_11\bin\‘ JAVA_HOME should be the parent directory: C:\Program Files\Java\jdk1.6.0_11\‘. Give that a try and cross your fingers this time.