similar to: rJava System.out / System.err & stacktraces

I have been experiencing issues with an R script hanging when connecting to an Oracle database. To help debug, I found a function here in the nabble forum and made a small test script: #!/usr/bin/Rscript --no-restore --no-save --no-init-file library("RJDBC") drv<-JDBC("oracle.jdbc.OracleDriver","/home/oracle/lib/ojdbc6.jar", "'") dbCheck =

Dear all, I am facing a problem with running a script that i have written in R and i hope you can help me spot which exactly is the problem and how i can solve it. The error I get is the following: ---- Error in .jcheck(silent = FALSE) : Java Exception <no description because toString() failed>.jcall(row[[ir]], "Lorg/apache/poi/ss/usermodel/Cell;", "createCell",

Hi list, I'm wanting to use a matrix as input to some java code, but I seem to be unable to do this (See code below). When searching online for a solution I found that rJava 0.5-2 (the version under development not yet in CRAN) is adding "direct support for raw vectors as method parameters". Is this related? I also tried to use .jarray / .jcast in various combinations to no avail.

I'm writing a package that successfully calls Java from R using rJava. When R sends my Java function bad data (through .jcall()), I get the error message details (when I run it on a console) and then: Java requested System.exit(1), closing R. Is there a way to call .jcall so that when Java receives bad data, the Java function will exit, but won't take down R with it? Thanks, Sigal

I am desperate for help. I am trying to get the RJDBC and rJava .5to work on both my windows xp and linux Redhat EL5 Server. On both I get a ava.lang.ClassNotFoundException when calling JDBC(). My example is require(RJDBC) classPath='C:\\libraries\\mysql-connector-java-5.1.3-rc\\mysql-connector-java-5.1.3-rc-bin.jar' driverClass=c("com.mysql.jdbc.Driver") drv <-

Hi All, I have written a Java MapReduce code that runs on Hadoop. My intention is to create an R package which will call the Java code and execute the job. Hence, I have written a similar R function. But when I call this function from R terminal, the Hadoop job is not running. Its just printing few lines of warning messages and does nothing further. Here is the execution scenario: *>

Dear All, I'd like to use Weka functions that are not implemented (do not have interface) in RWeka, like the Remove function and others in the future! The .java() functionality is for that purpose but I haven't seen any example with Weka functions. Could anyone give me hand in how to do it? For instace if I want to use the weka.filters.unsupervised.attribute.Remove? 1. in the R console,

Could some pls help with this error message. Pls see below thanks Rupak ---------- Forwarded message ---------- From: Rupak Khurana <khurana.rupak@gmail.com> Date: Jan 31, 2007 2:46 PM Subject: Unable to load rJava - Undefined Symbol GetCreatedJavaVMs To: simon.urbanek@r-project.org Simon I am unable to load rJava. Pls see the log below. Any help is welcome and appreciated. thanks

Hi, I am trying to integrate my Java program with R using rJava package. I want to execute the whole Java program from R. The main() method in my Java code calls all the other defined methods. So, I guess I have to call the main() method in .jcall. An example Java code: *class A { public static int mySum(int x, int y) { return x+y; } public static void

Hi everyone, I want to call a Java application from R and have encountered some problems with the way rJava deals with the system class loader. To run my application, I use the following R script: > library(rJava) > .jinit() > .jaddClassPath("myApp.jar") > rWrapper <- .jnew("org/test/RWrapper") > .jcall(rWrapper,"V","start") My Java

After some trial and error I figured out how to pass matrices from R to java and back using rJava, but this method is not documented and I wonder if there is a better way? Anyway, here is what I found works: (m = matrix(as.double(1:12),3,4)) [shows m as you would expect] jtest <- .jnew("JTest") (v <- .jcall(jtest, '[[D], 'myfunc', .jarray(m), evalArray=FALSE)) [shows

I have received a few private emails asking for some simple demonstration of calling Java code from R using the rJava package (which can be installed directly inside R). Here is one example for convolving two vectors (an example in the R manual about linking C with R). First write a Java program public class my_convolve { public static double[] convolve(double[] a, double[] b)

I am trying to invoke an in house developed java program from R and am running into some confusing issues. I've written this function: DoNormalSkew <- function() { .jaddClassPath("U:/development/software/untilities/ELVeSkew/dist/ELVeSkew.jar") .jpackage("U:/development/software/utilities/ELVeS/dist/ELVeSkew.jar") .jcall("java/lang/System", "V",

Hi all! I recently tried to install the rJava package on my notebook (Debian Etch / Kernel 2.6.15 / jdk 1.5.0-5 / R 2.2.1 / rJava ?? the repo one, have a look below). I compiled R myself with "--with-readline=no" and "--enable-R-shlib flags". Now, each time loading the library rJava I encouter the same error. I reinstalled several times (as root), always the same problem:

Bare test code: My simple Java test class source and R test code follow: public class RJavTest { public static void main(String[]args) { RJavTest rJavTest=new RJavTest(); } public final static String conStg="testString"; public final static double con0dbl=10000001; public final static double[]con1Arr=new double[] { 10001,10002,10003,10004,10005,10006 }; public final static

Hi, I have a MapReduce Java code, which I am calling from R using rJava. I have prepared the R package and tested that successfully. But when I deployed the package in a cluster and executed it, I am getting ClassNotFoundException. If I run the same job directly without integrating with R, it runs perfectly. Here is my R code: library(rJava) muMstSpark <- function(mesosMaster = NULL, input =

Hola. En mi caso, no he podido resolver los problemas con el Java para usar XLConnect, que en los papeles me parece el mejor. Supongo que algo de la arquitectura del sistema o bien de la relación entre el Java, el R y el RStudio. Así que utilizo library(openxlsx) write.xlsx(datos, file = "EDA1.xlsx") #donde datos es el objeto que quiero guardar. Requiere instalar el RTools, según tipo y

Dear List, Java Exception error while reading large data in R from DB using RJDBC. I am trying to read large data from DB table(Vectorwise), using RJDBC connection. I have tested the connection with small size data and was able to fetch DB tables using same connection(conn as in my code). Please suggest where am i going wrong or alternate option to solve such issues while reading large DB

rJava offers a mechanism to call arbitrary methods in Java. Wouldn't you use that mechanism to call whatever you would call if you were programming in Java (e.g. System.gc)? -- Sent from my phone. Please excuse my brevity. On February 5, 2018 7:34:17 PM PST, Benjamin Tyner <btyner at gmail.com> wrote: >Hi > >Does rJava offer a way to instruct the JVM to perform a garbage

Hi Does rJava offer a way to instruct the JVM to perform a garbage collection? Regards Ben