import R forecast library JAR files into java - r

Question

I am trying to import the R package 'forecast; in netbeans to use its functions. I have managed to make the JRI connection and also to import the javaGD library and experimented with it with a certain success. The problem about the forecasting package is that I cannot find the corresponding JAR files so to include them as a library in my project. I am loading it normally : re.eval(library(forecast)), but when I implement one of the library's function, a null value is returned. Although I am quite sure that the code is correct I am posting it just in case.
tnx in advance
Rengine re = new Rengine(Rargs, false, null);
System.out.println("rengine created, waiting for R!");
if(!re.waitForR())
{
System.out.println("cannot load R");
return;
}
re.eval("library(forecast)");
re.eval("library(tseries)");
re.eval("myData <- read.csv('C:/.../I-35E-NB_1.csv', header=F, dec='.', sep=',')");
System.out.println(re.eval("myData"));
re.eval("timeSeries <- ts(myData,start=1,frequency=24)");
System.out.println("this is time series object : " + re.eval("timeSeries"));
re.eval("fitModel <- auto.arima(timeSeries)");
REXP fc = re.eval("forecast(fitModel, n=20)");
System.out.println("this is the forecast output values: " + fc);

Answer 1

You did not convert values from R into java, you should first create a numerical vector of auto.arima output in R, and then use the method .asDoubleArray() to read it into java.
I gave a complete example in [here] How I can load add-on R libraries into JRI and execute from Java? , that shows exactly How to use the auto.arima function in Java using JRI.