R Script not able to read .Rda file when executed from Java

Question

I'm new to Rscript so please bear with me, I need to execute a R script (written by another developer) from java and for that I'm using Renjin. The R script file and other required files are on classpath i.e. under resources folder.

To achieve this I'm loading Rscript from classpath and it gets loaded successfully, and Rscript tries to load a abc.Rda file internally which is also present in classpath (parallel to R script), the code for same is below

load('abc.Rda')

But when I try to execute script then it throws exception as below:

Could not read from "file:///D:/data/{project-dir}/abc.Rda" because it is a not a file.

Please suggest where I'm making mistake.

I've tried various tests but wasn't able to produce any errors: single, double quotes, capitalized file extension when actual is lower case, etc. save(d, file='abc.rda') load('abc.Rda') — Bobby
– Bobby, Commented Jul 4, 2016 at 20:41
Could you try load('abc.Rda', verbose = TRUE) to see if it gives any more clues? Also, maybe you could look into character encoding: stackoverflow.com/questions/34024654/… — Bobby
– Bobby, Commented Jul 4, 2016 at 22:20
What's in the Rda file? Could this be related to or a regression of github.com/bedatadriven/renjin/issues/106? (I'm assuming that the R code works without error if run outside of renjin.) — r2evans
– r2evans, Commented Jul 5, 2016 at 5:42

akbertram · Accepted Answer · 2016-07-08 20:54:59Z

1

I'm not sure why using the absolute path didn't work: perhaps the script is incorrectly calling setwd(dir='/bad/{project-dir}') somewhere earlier?

Renjin actually mediates file system operations through Apache Virtual File System (VFS). So if you specifically want a resource on the classpath, you can use the "res:" protocol, for example:

load('res:com/acme/mypackage/abc.Rda')

This should work whether the file is actually on the filesystem or packaged as part of a jar or other archive.

answered Jul 8, 2016 at 20:54

akbertram

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