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error: JAVA_HOME cannot be determined from the Registry, This error notice happens most frequently when we try to load the xlsx package.

## Approach 1: error: JAVA_HOME cannot be determined from the Registry

The error message “JAVA HOME cannot be identified from the Registry” will be replicated in this example.

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install.packages("xlsx")
library("xlsx")
#   call: fun(libname, pkgname)
#   error: JAVA_HOME cannot be determined from the Registry
# Failed with error:  'package 'rJava' could not be loaded'

After installing and loading the xlsx package, the error “JAVA HOME cannot be found from the Registry” was returned to the R interface.

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This issue, however, is caused by the rJava package, not the xlsx package. When we install the xlsx package, R also wants to install the rJava package.

When we try to install the rJava package, we get the error message “JAVA HOME cannot be obtained from the Registry.”

This is frequently due to the fact that you are running a 64-bit version of R but not a 64-bit version of Java. It’s possible that you installed a 32-bit version of Java or that you didn’t install Java at all.

It’s worth noting that the Java download page defaults to the 32-bit version. As a result, the 64-bit version must be installed manually.

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## Approach 2: Fixing the Error: JAVA_HOME cannot be determined from the Registry

Here we are showing how to fix difficulties caused by rJava when trying to load an R package.

After installing the 64-bit version of Java, we must reinstall and load the rJava package (or, in our case, the xlsx package):

install.packages("xlsx")
library("xlsx")                  

This time it went off without a hitch!

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