RCaller: prevent automatic error printing

Question

I'm using RCaller to execute some analysis on a data frame within my Java application. More specifically, I want to run Coarsened Exact Matching using the CEM library of R.

As far as CEM is concerned, it returns some data about the mathching, if any match is found. Otherwise (no match found) it fails.

When I call the runAndReturnResult method from my Java application, if CEM fails inside R, RCaller automatically prints on my Java application's console, all the code that I added to my RCode instance.

Is there a way for preventing this printing? I mean, I want to ignore the cases in which no match is found and move forward, without printing messages on my console.

Thanks in advance to anyone that can help.

Answer 1

There are two ways to handle this:

• RCaller is using java.util.logging.Logger, so you need to add a logback.xml - file for disabling the output of the logger.
• use tryCatch({}) inside R so that your R code won't break -> won't trigger any errors in Java.

I would recommend the second solution.

update:

you have to add an error - block

mat <- tryCatch({
   cem(treatment = "c_CLUSTER", data = df, drop = dp))
 }, error = function(e) {
    NULL # or do something else
 }, finally = {
 })

And if you want to ignore all the warnings, wrape your method call in suppressWarnings(<method-call>)

Or you can also add an warning - block to the tryCatch - block