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Cant download package xlsx or rjava R

I am trying to download the xlsx package in R but get the following error message:
Error: package or namespace load failed for 'xlsx':
.onLoad failed in loadNamespace() for 'rJava', details:
call: fun(libname, pkgname)
error: No CurrentVersion entry in Software/JavaSoft registry! Try re-installing Java and make sure R and Java have matching architectures.
Error: loading failed
Execution halted
*** arch - x64
ERROR: loading failed for 'i386'
* removing 'C:/Users/X/Documents/R/win-library/3.6/xlsx'
Warning in install.packages :
installation of package ‘xlsx’ had non-zero exit status
I have also tried to download rjava, but get this error message:
ERROR*> JavaSoft\{JRE|JDK} can't open registry keys.
ERROR: cannot find Java Development Kit.
Please set JAVA_HOME to specify its location manually
ERROR: configuration failed for package 'rJava'
* removing 'C:/Users/X/Documents/R/win-library/3.6/rJava'
* restoring previous 'C:/Users/X/Documents/R/win-library/3.6/rJava'
Warning in install.packages :
installation of package ‘rJava’ had non-zero exit status
I have reinstalled Java to my computer, with the same architecture s my computer and R (64-bit), which most of the help online says that I should try out. Have anyone experienced the same problem?

How to install 'xlsx' in R

> library(**xlsx**)
Unable to find any JVMs matching version "(null)".
No Java runtime present, try --request to install.
Error: package or namespace load failed for ‘xlsx’:
.onLoad failed in loadNamespace() for 'rJava', details:
call: fun(libname, pkgname)
error: JVM could not be found
In addition: Warning messages:
1: In system("/usr/libexec/java_home", intern = TRUE) :
running command '/usr/libexec/java_home' had status 1
2: In fun(libname, pkgname) :
Cannot find JVM library 'NA/lib/server/libjvm.dylib'
Install Java and/or check JAVA_HOME (if in doubt, do NOT set it, it will be detected)
#then I tried 'writexlx' but then that began giving me error messages
>BiocManager::install('**writexslx**')
Bioconductor version 3.11 (BiocManager 1.30.10), R 4.0.2 (2020-06-22)
Installing package(s) 'writexslx'
Warning message:
package ‘writexslx’ is not available (for R version 4.0.2)
#I am not sure how to download this, please help
I evene tried to download jdk and that hasn't worked for me either.

Cannot install xlsx package for R

Cannot install R package xlsx.
I have previously used the package on other PCs and had no trouble with it whatsoever, but am having difficulty with a new PC. From what I can tell the issue is something to do with Java. Currently tried:
Downloading Java Development Kit
Downloading JRE
Editing environment variables to point to the right Java (for both of the above)
Running through the R console (both 32 and 64 bit)
Uninstalling and reinstalling Rstudio / R
install.packages("xlsx")
`Installing package into ‘C:/Users/Fred Goktas/Documents/R/win-library/3.3’
(as ‘lib’ is unspecified)
There is a binary version available but the source version is later:
binary source needs_compilation
xlsx 0.5.7 0.6.1 FALSE
installing the source package ‘xlsx’
trying URL 'https://cran.rstudio.com/src/contrib/xlsx_0.6.1.tar.gz'
Content type 'application/x-gzip' length 315441 bytes (308 KB)
downloaded 308 KB
* installing source package 'xlsx' ...
** package 'xlsx' successfully unpacked and MD5 sums checked
** R
** inst
** preparing package for lazy loading
** help
* installing help indices
** building package indices
** installing vignettes
** testing if installed package can be loaded
* arch - i386
Error : .onLoad failed in loadNamespace() for 'rJava', details:
call: inDL(x, as.logical(local), as.logical(now), ...)
error: unable to load shared object 'C:/Users/Fred Goktas/Documents/R/win-library/3.3/rJava/libs/i386/rJava.dll':
LoadLibrary failure: %1 is not a valid Win32 application.
Error: loading failed
Execution halted
*** arch - x64
ERROR: loading failed for 'i386'
* removing 'C:/Users/Fred Goktas/Documents/R/win-library/3.3/xlsx'
Warning in install.packages :
running command '"C:/PROGRA~1/R/R-33~1.3/bin/x64/R" CMD INSTALL -l "C:\Users\Fred Goktas\Documents\R\win-library\3.3" C:\Users\FREDGO~1\AppData\Local\Temp\RtmpYLz0xk/downloaded_packages/xlsx_0.6.1.tar.gz' had status 1
Warning in install.packages :
installation of package ‘xlsx’ had non-zero exit status
Package should install without any troubles.

Unless you have no compelling reason to use xlsx, I would suggest you consider readxl because it has no external dependencies.

Error in i.p(...) : installation of package ... had non-zero exit status

I try to install the RDRPOSTagger package through devtools.
devtools::install_github("bnosac/RDRPOSTagger", build_vignettes = TRUE)
Downloading GitHub repo bnosac/RDRPOSTagger#master
WARNING: Rtools is required to build R packages, but is not currently installed.
Please download and install Rtools 3.5 from http://cran.r-project.org/bin/windows/Rtools/.
√ checking for file 'C:\Users\X1\AppData\Local\Temp\RtmpUD2iwv\remotes70c59a944c1\bnosac-RDRPOSTagger-af51e38/DESCRIPTION' ...
- preparing 'RDRPOSTagger': (1.1s)
√ checking DESCRIPTION meta-information ...
- checking for LF line-endings in source and make files and shell scripts
- checking for empty or unneeded directories
- building 'RDRPOSTagger_1.1.tar.gz'
Installing package into ‘C:/Users/X1/Documents/R/win-library/3.5’
(as ‘lib’ is unspecified)
* installing *source* package 'RDRPOSTagger' ...
** R
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
converting help for package 'RDRPOSTagger'
finding HTML links ... done
rdr_add_space_around_punctuations html
rdr_available_models html
rdr_model html
rdr_pos html
** building package indices
** installing vignettes
** testing if installed package can be loaded
*** arch - i386
Error: package or namespace load failed for 'rJava':
.onLoad failed in loadNamespace() for 'rJava', details:
call: fun(libname, pkgname)
error: No CurrentVersion entry in Software/JavaSoft registry! Try re-installing Java and make sure R and Java have matching architectures.
Error : package 'rJava' could not be loaded
Error: loading failed
Execution halted
*** arch - x64
ERROR: loading failed for 'i386'
* removing 'C:/Users/X1/Documents/R/win-library/3.5/RDRPOSTagger'
In R CMD INSTALL
Error in i.p(...) :
(converted from warning) installation of package ‘C:/Users/X1/AppData/Local/Temp/RtmpUD2iwv/file70c8917649/RDRPOSTagger_1.1.tar.gz’ had non-zero exit status
Session Info:
sessionInfo()
R version 3.5.2 (2018-12-20)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
Java version on my CPU: java 10.0.2 64 bit
I try to use the qdap package which also needs rJava and this works just fine.

Error : package 'rJava' could not be loaded
This package is not loaded because JAVA_HOME is not set.
It can be done by first installing depending on your R (32 bit or 64 bit), Java 32 bit or 64 bit.
Download java from here: https://www.java.com/en/download/
Using this find JAVA_HOME address:
find.java <- function() {
for (root in c("HLM", "HCU")) for (key in c("Software\\JavaSoft\\Java Runtime Environment",
"Software\\JavaSoft\\Java Development Kit")) {
hive <- try(utils::readRegistry(key, root, 2),
silent = TRUE)
if (!inherits(hive, "try-error"))
return(hive)
}
hive
}
Load find.java and you will find the address for JAVA_HOME. Enter that address here:
Sys.setenv(JAVA_HOME='C:\\Your\\Java\\Directory')
library(rJava)
That should load the package rJava.
ERROR: loading failed for 'i386'
This error is maybe because you have downloaded both version of R (32 bit and 64 bit) and devtools tries to build for both of them.
You can use this:
devtools::install_github("mne-tools/mne-r", INSTALL_opts=c("--no-multiarch"))
I was also getting the similar type of error and after searching through I came across this solutions which worked for me.

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

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?

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