Add Linux support for easy rJava loading, add env setting for building rJava from source an all platforms

CITATION.cff

@@ -8,28 +8,31 @@ message: 'To cite package "rJavaEnv" in publications use:'
 type: software
 license: MIT
 title: 'rJavaEnv: ''Java'' Environments for R Projects'
-version: 0.3.0
+version: 0.3.0.9000
 doi: 10.32614/CRAN.package.rJavaEnv
 identifiers:
 - type: doi
   value: 10.32614/CRAN.package.rJavaEnv
-abstract: 'Quickly install ''Java Development Kit (JDK)'' without administrative privileges
+abstract: 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.'
+  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). For users who need to install
+  'rJava' or other 'Java'-dependent packages from source, 'rJavaEnv' will display
+  a message with instructions on how to run 'R CMD javareconf' to make the 'Java'
+  configuration permanent, but also provides a function 'java_build_env_set' that
+  sets the environment variables in the current R session temporarily to allow installation
+  of 'rJava' from source without 'R CMD javareconf'. On 'Linux', in addition to setting
+  environment variables, 'rJavaEnv' also dynamically loads 'libjvm.so' to ensure 'rJava'
+  works correctly. See documentation for more details.
 authors:
 - family-names: Kotov
   given-names: Egor
@@ -131,6 +134,21 @@ references:
     orcid: https://orcid.org/0000-0002-4035-0289
   year: '2025'
   doi: 10.32614/CRAN.package.jsonlite
+- type: software
+  title: rlang
+  abstract: 'rlang: Functions for Base Types and Core R and ''Tidyverse'' Features'
+  notes: Imports
+  url: https://rlang.r-lib.org
+  repository: https://CRAN.R-project.org/package=rlang
+  authors:
+  - family-names: Henry
+    given-names: Lionel
+    email: lionel@posit.co
+  - family-names: Wickham
+    given-names: Hadley
+    email: hadley@posit.co
+  year: '2025'
+  doi: 10.32614/CRAN.package.rlang
 - type: software
   title: utils
   abstract: 'R: A Language and Environment for Statistical Computing'
@@ -183,4 +201,29 @@ references:
   year: '2025'
   doi: 10.32614/CRAN.package.testthat
   version: '>= 3.0.0'
+- type: software
+  title: withr
+  abstract: 'withr: Run Code ''With'' Temporarily Modified Global State'
+  notes: Suggests
+  url: https://withr.r-lib.org
+  repository: https://CRAN.R-project.org/package=withr
+  authors:
+  - family-names: Hester
+    given-names: Jim
+  - family-names: Henry
+    given-names: Lionel
+    email: lionel@posit.co
+  - family-names: Müller
+    given-names: Kirill
+    email: krlmlr+r@mailbox.org
+  - family-names: Ushey
+    given-names: Kevin
+    email: kevinushey@gmail.com
+  - family-names: Wickham
+    given-names: Hadley
+    email: hadley@posit.co
+  - family-names: Chang
+    given-names: Winston
+  year: '2025'
+  doi: 10.32614/CRAN.package.withr
 

DESCRIPTION

@@ -30,11 +30,16 @@ Description: Quickly install 'Java Development Kit (JDK)' without
     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.
+    project (e.g.  with the help of 'targets' package). For users who need
+    to install 'rJava' or other 'Java'-dependent packages from source,
+    'rJavaEnv' will display a message with instructions on how to run 'R
+    CMD javareconf' to make the 'Java' configuration permanent, but also
+    provides a function 'java_build_env_set' that sets the environment
+    variables in the current R session temporarily to allow installation
+    of 'rJava' from source without 'R CMD javareconf'. On 'Linux', in
+    addition to setting environment variables, 'rJavaEnv' also dynamically
+    loads 'libjvm.so' to ensure 'rJava' works correctly.  See
+    documentation for more details.
 License: MIT + file LICENSE
 URL: https://github.com/e-kotov/rJavaEnv, https://www.ekotov.pro/rJavaEnv/
 BugReports: https://github.com/e-kotov/rJavaEnv/issues
@@ -45,6 +50,7 @@ Imports:
     cli,
     curl,
     jsonlite,
+    rlang,
     utils
 Suggests: 
     quarto,

NAMESPACE

@@ -1,5 +1,7 @@
 # Generated by roxygen2: do not edit by hand
 
+export(java_build_env_set)
+export(java_build_env_unset)
 export(java_check_version_cmd)
 export(java_check_version_rjava)
 export(java_clear)
@@ -13,5 +15,6 @@ export(java_unpack)
 export(java_valid_versions)
 export(rje_consent)
 export(use_java)
+import(rlang)
 importFrom(utils,getFromNamespace)
 importFrom(utils,installed.packages)

NEWS.md

@@ -1,5 +1,17 @@
 # rJavaEnv (development version)
 
+## New features
+
+- Linux support. On Linux, `libjvm.so` location is automatically detected and force-loaded via `dyn.load()`. Thanks to that, `rJava` and any depenent R packages can be installed and loaded, if repositories with pre-built packages, such as `Posit Package Manager`, is used or if you build `rJava` from source, see the `java_build_env_set()` function.
+
+- New function `java_build_env_set()` that sets the environment (either temporarily in the current session or in `./.Rprofile` file of the current working directory) to build `rJava` from source on `macOS`, `Linux` and `Windows` platforms. It uses the current value of `JAVA_HOME` environment variable by default, so that it is more convenient to use after `java_quick_install()` or `use_java()` commands. After running `java_build_env_set()`, users can install `rJava` from source with `install.packages("rJava", type = "source")` without any additional configuration. However, users will still need some system dependencies, e.g. on Linux they will need: libpcre2-dev, libdeflate-dev, libzstd-dev, liblzma-dev, libbz2-dev, zlib1g-dev, libicu-dev. A system message with a suggested `apt-get` command is printed. On Windows, `Rtools` must be installed. On `macOS`, `Xcode Command Line Tools` must be installed. See the new vignette `Install 'rJava' from source` for more details.
+
+## Improvements
+
+- `java_quick_install()` now also invisibly returns the path to `JAVA_HOME`.
+
+- Added `{rlang}` as a dependency, as `{cli}` uses it anyway for the functions that we use in `{rJavaEnv}`, but does not declare it as a dependency. Therefore this previously might have caused annoyances to the users, as after installing `{rJavaEnv}` they could not use any of the functions until they installed `{rlang}` manually.
+
 # rJavaEnv 0.3.0
 
 ## New features