I'm trying to get LinkSnooper up and working on a Windows 7 machine to monitor the interaction between the Mathematica front end and MathLink. I'm facing great troubles following the instructions here. Namely, my arguments to MLOpen are as follows:

-LinkMode Launch -LinkName "'C:/Program Files/Wolfram Research/Mathematica/9.0/SystemFiles/Java/Windows-x86-64/javaw' -classpath \"C:/Program Files/Wolfram Research/Mathematica/9.0/SystemFiles/Links/JLink/JLink.jar\" com.wolfram.jlink.util.LinkSnooper -kernelname 'C:/Program Files/Wolfram Research/Mathematica/9.0/mathkernel.exe'"


and when loading the kernel, a file system browser pops up and asks me to select a MathLink program to run. Anyone got this working on a windows machine and perhaps have some suggestions?

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One problem is that your path to javaw is wrong (you forgot the bin dir). But that quoting style is very hard to make work, and possibly flat-out wrong (I swear that example in the documentation worked about nine years ago when I wrote it, but I cannot seem to make anything like it work now; my apologies).
-LinkMode Launch -LinkName '"C:/Program Files/Wolfram Research/Mathematica/9.0/SystemFiles/Java/Windows-x86-64/bin/javaw.exe" -classpath "C:/Program Files/Wolfram Research/Mathematica/9.0/SystemFiles/Links/JLink/JLink.jar" com.wolfram.jlink.util.LinkSnooper -kernelname "C:/Program Files/Wolfram Research/Mathematica/9.0/mathkernel.exe"'

Wow, finally I found this. I was wondering what is wrong. :) p.s. I had to use -cp instead of -classpath to make it work. – Kuba Oct 30 '14 at 11:35