Why do I get “JNI_GetCreatedJavaVMs returned -1” error while loading the xlsx package in R?

Question

I just downloaded xlsx package in R, but I just can't use the library. (On Mac)

> library(xlsx)
JavaVM: requested Java version ((null)) not available. Using Java at "" instead.
JavaVM: Failed to load JVM: /bundle/Libraries/libserver.dylib
JavaVM FATAL: Failed to load the jvm library.
Error : .onLoad failed in loadNamespace() for 'xlsx', details:
call: .jinit()
error: JNI_GetCreatedJavaVMs returned -1

Error: package or namespace load failed for ‘xlsx’

What am I doing wrong?

Answer 1

Make sure you have installed the dependencies:

• xlsxjars
• rJava

And, of course, if that does not work, verify you have the Java JDK installed in your mac: javac -version If not, just install it from here: https://java.com/en/download/faq/java_mac.xml