rje_envvar_exists

#' The function is based on the code of the <code>renv</code> package.
Copyright 2023 Posit Software, PBC
License: https://github.com/rstudio/renv/blob/main/LICENSE

internal

Quickly install 'Java Development Kit (JDK)' without
administrative privileges and set environment variables in current R
session or project to solve common issues with 'Java' environment
management in 'R'. Recommended to users of 'Java'/'rJava'-dependent
'R' packages such as 'r5r', 'opentripplanner', 'xlsx', 'openNLP',
'rWeka', 'RJDBC', 'tabulapdf', and many more. 'rJavaEnv' prevents
common problems like 'Java' not found, 'Java' version conflicts,
missing 'Java' installations, and the inability to install 'Java' due
to lack of administrative privileges.  'rJavaEnv' automates the
download, installation, and setup of the 'Java' on a per-project basis
by setting the relevant 'JAVA_HOME' in the current 'R' session or the
current working directory (via '.Rprofile', with the user's consent).
Similar to what 'renv' does for 'R' packages, 'rJavaEnv' allows
different 'Java' versions to be used across different projects, but
can also be configured to allow multiple versions within the same
project (e.g.  with the help of 'targets' package). Note: there are a
few extra steps for 'Linux' users, who don't have any 'Java'
previously installed in their system, and who prefer package
installation from source, rather then installing binaries from 'Posit
Package Manager'. See documentation for details.

Egor Kotov

rJavaEnv

'Java' Environments for R Projects

Chung-hong Chan

Mauricio Vargas

Hadley Wickham

Enrique Mondragon-Estrada

Jonas Lieth

rje_envvar_exists function

<dl><dt>key</dt>
<dd>The environment variable key to check.</dd></dl>

Arguments

Helper for clean env var check — rje_envvar_exists

<dl>

<dt>key</dt>
<dd>The environment variable key to check.</dd>

</dl>

rje_envvar_exists: Helper for clean env var check

Description

Usage

Arguments