Added Java version check.

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: arulesNBMiner
-Version: 0.1-5.1
-Date: 2015-xx-xx
+Version: 0.1-6
+Date: 2018-01-07
 Title: Mining NB-Frequent Itemsets and NB-Precise Rules
 Author: Michael Hahsler
 Maintainer: Michael Hahsler <mhahsler@lyle.smu.edu>
@@ -12,7 +12,7 @@ Description: NBMiner is an implementation of the model-based mining algorithm
     implemented.
 Depends: R (>= 2.10), arules (>= 0.6-6), rJava (>= 0.6-3)
 URL: http://lyle.smu.edu/IDA/arules/
-BugReports: https://github.com/mhahsler/arulesNBMiner/issues
+BugReports: https://github.com/mhahsler/arulesNBMiner
 Imports: methods, stats, graphics
 SystemRequirements: Java (>= 5.0)
 License: GPL-2

R/AAAonLoad.R

@@ -1,4 +1,13 @@
-.onLoad <-
-function(libname, pkgname)
-    rJava::.jpackage(pkgname, lib.loc = libname)
+## for rJava
 
+.onLoad <- function(libname, pkgname) {
+  options(java.parameters="-Xrs")  ### so sun java does not kill R on CTRL-C
+  .jpackage(pkgname, lib.loc = libname)
+}
+
+.jinit()
+jv <- .jcall("java/lang/System", "S", "getProperty", "java.runtime.version")
+if(substr(jv, 1L, 1L) == "1") {
+  jvn <- as.numeric(paste0(strsplit(jv, "[.]")[[1L]][1:2], collapse = "."))
+  if(jvn < 1.5) stop("Java 5 or higher is needed for this package but not available")
+}