Add a script that runs in an isolated R session to test which Java version rJava will pick up given the path to a Java JDK installation. This will require an appropirate R function within the core package code.

Author: e-kotov

inst/extdata/java-ver-via-rJava-init.R

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+# java-ver-via-rJava-init.R
+args <- commandArgs(trailingOnly = TRUE)
+java_home <- args[1]
+
+# Set the JAVA_HOME environment variable
+Sys.setenv(JAVA_HOME = java_home)
+
+# Update PATH to include the Java bin directory
+old_path <- Sys.getenv("PATH")
+new_path <- file.path(java_home, "bin")
+Sys.setenv(PATH = paste(new_path, old_path, sep = .Platform$path.sep))
+
+# Load rJava and initialize the JVM
+library(rJava)
+.jinit()
+
+# Check and print the Java version
+java_version <- rJava::.jcall("java.lang.System", "S", "getProperty", "java.version")
+
+# Print the Java version
+cat("Java version:", java_version, "\nAt path:", java_home, "\n")