Unable to use RJDBC at Shinyapp.io - r

Question

I have written a Shiny App which runs perfectly in my local machine. I have used RJDBC to connect to the DB2 database in IBM Cloud. The code is as follows.
#Load RJDBC
dyn.load('/Library/Java/JavaVirtualMachines/jdk-9.0.4.jdk/Contents/Home/lib/server/libjvm.dylib')
# dyn.load('/Users/parthamajumdar/Documents/Solutions/PriceIndex/libjvm.dylib')
library(rJava)
library(RJDBC)
As the path is hard coded, I copied the file libjvm.dylib to the Project directory and pointed to that. When I do this, R gives a fatal error.
I remove the absolute path and replaced with "./libjvm.dylib" and deployed the application on ShinyApp.io website. When I run the program, it gives a fatal error.
#Values for you database connection
dsn_driver = "com.ibm.db2.jcc.DB2Driver"
dsn_database = "BLUDB" # e.g. "BLUDB"
dsn_hostname = "dashdb-entry-yp-lon02-01.services.eu-gb.bluemix.net" # e.g. replace <yourhostname> with your hostname, e.g., "Db2 Warehouse01.datascientstworkbench.com"
dsn_port = "50000" # e.g. "50000"
dsn_protocol = "TCPIP" # i.e. "TCPIP"
dsn_uid = "<UID>" # e.g. userid
dsn_pwd = "<PWD>" # e.g. password
#Connect to the Database
#jcc = JDBC("com.ibm.db2.jcc.DB2Driver", "/Users/parthamajumdar/lift-cli/lib/db2jcc4.jar");
jcc = JDBC("com.ibm.db2.jcc.DB2Driver", "db2jcc4.jar");
jdbc_path = paste("jdbc:db2://", dsn_hostname, ":", dsn_port, "/", dsn_database, sep="");
conn = dbConnect(jcc, jdbc_path, user=dsn_uid, password=dsn_pwd)
Similarly, I copied the file "db2jcc4.jar" to my local project directory. If I point to the local project directory for this file in my local machine, the program works. However, when I deploy on ShinyApp.io, it gives fatal error.
Request your please letting me know what I need to do so that the application runs properly on the ShinyApp.io website.
The error is as follows when I run the application from Shiny server:
Attaching package: ‘lubridate’
The following object is masked from ‘package:base’:
date
Loading required package: nlme
This is mgcv 1.8-23. For overview type 'help("mgcv-package")'.
Error in value[[3L]](cond) :
unable to load shared object '/srv/connect/apps/ExpenseAnalysis/Drivers/libjvm.dylib':
/srv/connect/apps/ExpenseAnalysis/Drivers/libjvm.dylib: invalid ELF header
Calls: local ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted

Answer 1

What works for me is the following and it is independent of OS.
Create your own R package that contains the file you need somewhere in the extdata folder. As an example, your package could be yourpackage and the file would be something like extdata/drivers/mydriver.lib. Typically this would be stored at this location inst/extdata/drivers. See http://r-pkgs.had.co.nz/inst.html for details.
Store this package on github and if you want privacy you will need to work out how to grant an access token.
Use the devtools package to install it. The command would be something like this, devtools::install_github("you/yourpackage", auth_token = "youraccesstoken"). Do this once before deploying to Shiny.io. Ensure that you also do library(yourpackage). The package submission process will work out that it needs to fetch from Github.
Use the following R code to find the file.
system.file('extdata/drivers/mydriver.lib, package='yourpackage'). This will give you the full path to the file and you can use it.