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Nov 20, 2022
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document to use aliases to set JVM args #232

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24 changes: 24 additions & 0 deletions topics/embedded.md
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Expand Up @@ -81,12 +81,36 @@ two important libraries for clojure loaded, nrepl and cider which allow a rich,
interactive development experience so let's now connect to that port with our favorite
Clojure editor - emacs of course ;-).

### Passing JVM arguments

If you want to specify arbitrary arguments for the JVM to be started by Python,
you can use the environment variable `JDK_JAVA_OPTIONS` to do so. It will be picked up by
the JVM when starting.

Since clojurebridge 0.0.8, you can as well specify a list of aliases, which get resolved
from the `deps.edn` file. This allows as well to specify JVM arguments and JVM properties.

Example:

Starting Clojure embedded from python via

```python
cljbridge.init_jvm(aliases=["jdk-17","fastcall"],start_repl=True)
```
and a `deps.edn` with

```clojure
:aliases {

:fastcall
{:jvm-opts ["-Dlibpython_clj.manual_gil=true"]}
:jdk-17
{:jvm-opts ["--add-modules=jdk.incubator.foreign"
"--enable-native-access=ALL-UNNAMED"]}}
```

would add then the appropriate JVM options.

## From the Clojure REPL


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