Hi all,
first of all: Sorry for my bad englis, and now the Question:
I have some problems with running R from Java. First i tried using rJava (JRI).
But the examples didnt work properly.
Now im trying to establish a connection by using Rserve and JRclient (RF503).
I have the following code, which i`ve found:
------------------------------------------------------------------------
public class RTester {
public static void main(String[] args) {
Rconnection c = getLocalRconnection();
if (c != null) {
try {
double[] d = c.eval("rnorm(10)").asDoubleArray();
for (double n : d)
System.out.println(n);
} catch (RSrvException e) {
e.printStackTrace();
}
}
}
private static Rconnection getLocalRconnection() {
try {
return new Rconnection();
} catch (RSrvException e) {
//If we get this kind of error, it may be because Rserve is not
running
if (e.getMessage().equals("Cannot connect: Connection refused")) {
try {
String rserveStartCommand = "R CMD Rserve --vanilla";
//do a blocking call to the shell command for starting
Rserve
int exitValue =
Runtime.getRuntime().exec(rserveStartCommand).waitFor();
//if it returned success, try connecting again
if (exitValue == 0)
return new Rconnection();
//otherwise, Rserve is probably not installed
else
System.err.println("Could not start Rserve - is it
installed properly? Shell command \""+rserveStartCommand+"\" exited with exit
value "+exitValue+".");
} catch (Exception e1) {
e1.printStackTrace();
}
}
else
e.printStackTrace();
}
return null;
}
-------------------------------------------------------------------------
The Problem ist, that i get the following Exception:
org.rosuda.JRclient.RSrvException: Handshake failed: The server uses more
recent protocol than this client.
at org.rosuda.JRclient.Rconnection.<init>(Rconnection.java:113)
at org.rosuda.JRclient.Rconnection.<init>(Rconnection.java:58)
at org.rosuda.JRclient.Rconnection.<init>(Rconnection.java:42)
at tester.RTester.getLocalRconnection(RTester.java:28)
at tester.RTester.main(RTester.java:14)
Well, i understand, that tehre seems to be a version problem, but i dont
understand what kind of. Im using the most recent Versions of RServe and
JRclient which i could find on the page.
btw. im using Windows XP Pro and Eclipse ganimed (recent Version) as IDE.
Java jdk is at version 1.6.
Thx in advance for any help!
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