Unable to use xlsx

Hi, I'm new to R and trying to use xlsx. I can't get it to run - please see the below error message. I've tried to install a recent java version but it didn't seem to fix the problem. I am using 10.13.6 Mac High Sierra OS .Could anyone help? Thank you.

library(xslx)

Error in library(xslx) : there is no package called ‘xslx’

install.packages('xlsx',repos='http://cran.r-project.org')

trying URL 'http://cran.r-project.org/bin/macosx/el-capitan/contrib/3.6/xlsx_0.6.1.tgz'
Content type 'application/x-gzip' length 461752 bytes (450 KB)

downloaded 450 KB

The downloaded binary packages are in
/var/folders/rq/5mw7b6_j4wj18s5vvdd8d36r0000gn/T//RtmpHqeU5G/downloaded_packages

library(xlsx)

Unable to find any JVMs matching version "(null)".
Error: package or namespace load failed for ‘xlsx’:
.onLoad failed in loadNamespace() for 'rJava', details:
call: dyn.load(file, DLLpath = DLLpath, ...)
error: unable to load shared object '/Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so':
dlopen(/Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so, 6): Library not loaded: /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home/lib/server/libjvm.dylib
Referenced from: /Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so
Reason: image not found
In addition: Warning message:
In system("/usr/libexec/java_home", intern = TRUE) :
running command '/usr/libexec/java_home' had status 1
No Java runtime present, try --request to install.

You can try running this command on a system terminal and rebooting your machine.

sudo R CMD javareconf

Thank you, I tried entering that command in R but got the following error. I wasn't sure what you meant by system terminal - is there a location on a Mac where you mean I should be entering that?

sudo R CMD javareconf
Error: unexpected symbol in "sudo R"

I do have Java, I just checked it, updated to the latest version and restarted the computer.
I then opened R and retried opening xlsx and got the following error message again:

library(xlsx)

Error: package or namespace load failed for ‘xlsx’:
.onLoad failed in loadNamespace() for 'rJava', details:
call: dyn.load(file, DLLpath = DLLpath, ...)
error: unable to load shared object '/Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so':
dlopen(/Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so, 6): Library not loaded: /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home/lib/server/libjvm.dylib
Referenced from: /Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so
Reason: image not found
In addition: Warning message:
In system("/usr/libexec/java_home", intern = TRUE) :
running command '/usr/libexec/java_home' had status 1
Unable to find any JVMs matching version "(null)".
No Java runtime present, try --request to install.

On my project I wanted to be able to read Excel as inputs, but I wanted to avoid java dependency.
I found this package worked very well for my needs:

Thank you so much! I just used that package to successfully import an excel file with no java issues.
Thanks again!

You're welcome smatt

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Yes, on the terminal

https://macpaw.com/es/how-to/use-terminal-on-mac

Then you haven't java properly installed

Thank you - I entered the command there and got the following message:
Java interpreter : /usr/bin/java
No Java runtime present, requesting install.

*** Java interpreter doesn't work properly.