Question

How do I send R errors from console to standard java output?

Answer 1

R offers a command to save its console output as characters vector.

capture.output( {command} )

We can access the output using

REXPString s = rengine.parseAndEval("capture.output( to.monthly(mySeries))")
String[] output = result.asStrings()

The variable output will contain all output lines

[0]             mySeries.Open mySeries.High mySeries.Low mySeries.Close
[1]Jan 2001             1             6            1              6