rJava and xlsx are
difficult to install. so I made this package to separate dependencies of
these packages from some package.The following code makes rJava work fine, but I am not
sure that this is effective for others.
 if(Sys.getenv("JAVA_HOME")!=""){
    Sys.setenv(JAVA_HOME="")
}The above code is effective for my following error
   i Loading pkg
  Error: Dependency package(s) 'xlsx' not available.
  Run `rlang::last_error()` to see where the error occurred.
  In addition: Warning message:
  In (function (dep_name, dep_ver = "*")  :
    Dependency package 'xlsx' not available.For error of rJava, the above code is also
effective.
NOTE: As the environment variable JAVA_HOME, the path
C:\Program Files (x86)\Java\jre1.8.0_311 is not correct ….I
also tried jdk.