# New: Julia for JetBrains IDEs (Flexible Julia)

**URL:** <https://discourse.julialang.org/t/new-julia-for-jetbrains-ides-flexible-julia/134658>\
**Category:** Tooling\
**Created:** [December 21, 2025, 5:19am UTC](https://discourse.julialang.org/t/new-julia-for-jetbrains-ides-flexible-julia/134658 "2025-12-21T05:19:07Z")\
**Posts on this page:** 1\
**Showing post:** 187

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**Author:** ![madppiper](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/madppiper/32/220029_2.png) [@madppiper](https://discourse.julialang.org/u/madppiper)\
**Post date:** [March 24, 2026, 8:22am UTC](https://discourse.julialang.org/t/new-julia-for-jetbrains-ides-flexible-julia/134658/187 "2026-03-24T08:22:02Z")

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**New Release: Flexible Julia 2026.9.11**

New Features:

- Hot-Swap Debugger: Swap out functions while paused at a breakpoint - changes take effect immediately
- DAP hot-reload now attempts frame reconstruction so the current paused frame uses the new code right away
- Tab-iterable variable placeholders in postfix templates `.for`, `.if`, `.while`, `.try`

Fixes:

- External package symbols from `using` fully resolved in undefined variable inspection (#85)
- Type names in `isa` and `::` expressions no longer flagged as undefined variables (#85)
- Postfix templates (`.for`, `.if`, `.while`) no longer malformed when expression ends with `)` or `]` (#88)
- Quote auto-closing now works for `"` and `'` (#89)

* * *

**HOT-SWAPPING IS HERE!**  
This actually took me a lot longer to implement, cause I had to hack my way around frame modification, but now we got hot-swapping support. I got inspired by [Julia debugging is extremely slow - #12 by tue](https://discourse.julialang.org/t/julia-debugging-is-extremely-slow/135839/12), and even though it is not perfect, it is perhaps a step in the right direction.

So here’s what it does: You can now edit a function while paused at a breakpoint and have it take effect immediately - no need to restart your debug session. The DAP layer even tries to reconstruct the current frame so you’re running the new code right away. This means, you can start a debug session (either in REPL or native JetBrains), set a breakpoint and modify the sources. The debugger will update with you. You can see it working in the video in my post above.

This should make the edit-debug cycle a lot faster, especially when you’re tracking down those bugs that only show up after a long warmup.

Apart from that, I also added a few fixes to the validator and some convenience features.

* * *

@tue: for sharing your problems with “debugging in julia”  
@ufechner7: Thanks for the follow-up on external package symbol recognition!  
@SamuelMathieu-code: Appreciate the reports on postfix templates and editor usability - all fixed!

* * *

The new release is already available in the beta channel and you can expect JetBrains to approve it today or early tomorrow.

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