Problems when trying to load a package in R due to rJava

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The reason is probably linked to the fact you are using a 64-bit OS and R version but do not have Java installed with the same architecture.
What you have to do is to download Java 64-bit from this page: https://www.java.com/en/download/manual.jsp

After that just try to reload the xlsx package. You shouldn’t need to re-start R or if it does not work restart once.

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