从Java运行R脚本

Question

I've got a problem when I try to run a R script from Java Netbeans on Mac OS. I truly look for an answer of this problem on internet but nothing works.

I've used Rserve and Runtime.getRuntime().exec("Rscript myScript.R") but neither of them works with my program.

When I use Rserve, I run Rserve(args="--no-save") on R console and Rconnection.eval("\\myscript.R") on Java program and when I execute it, the program continues running without any response, no errors either and no stops. In fact when I try to execute a more simply R script, like calculate the mean or something like that, it works, but when I try to coerce a data.frame in a xts/zoo time series or just to load xts/zoo library first in my script, the program doesn't stop running and does nothing.

On the other hand, when I try to execute "Runtime.getRuntime().exec("Rscript myScript.R")" like appears in other similar post, nothing happens. The program looks to execute the script but it doesn't give me any result although stops running at least. Maybe it is because of Mac OS and that I couldn't indicate to Java what is the Rscript or R.app path, I don't really know.

Thank you very much in advance and I wish you could help me.

Javi.

The file code is:

public void Rconnection () {

RConnection c=new RConnection();
System.out.println("INFO : Trying to Connect to R");                          
c.parseAndEval("source(\"/scriptname.R\")");
System.out.println("Greeting from R:" + result.asString());
c.close();
}

And the R script is:

EU.df <- read.csv("/myinput.csv",header=T)
EU.xts <- xts(EU.df[,2:5],seq(as.Date("1970-01-02"),len=nrow(EU.df),by="day"))
write.csv(EU.df, file = "/myoutputfile.csv",row.names=FALSE)

Maybe it's because of some problems with R libraries or because of MAC OS.

Answer 1

Have you tried using JRI ? That might "block" unlike RServe and give you better messages.

For example:

REngine re = new JRIEngine(new String[] { "--no-save" }, new RCallback(), false);
re.parseAndEval("source(\"/scriptname.R\")");
re.close();