---
title: "Calc 2.1 a19 not starting"
url: "https://openforis.support/questions/3258/calc-21-a19-not-starting"
tags: ["calc"]
status: "accepted"
score: 0
answer_count: 2
asked: "2021-10-12T16:30:47"
last_activity: "2021-10-13T22:28:14"
source: "Open Foris Support - Q&A Forum"
license: "Copyright Open Foris, 2026. Some rights reserved under creative commons license."
---

# Calc 2.1 a19 not starting

Asked by wexxo on 2021-10-12

Dear Mino,

after some time I am trying to use Calc again. I've updated to 2.1 a19 and Calc doesn't start up anymore. I have followed the threats in the forum and also in the manual. I have updated R to 4.1.1 and R Studio, both are installed in c:\opt\... I am running JDK on ver. 17. However when I start up Calc nothing happens.

What did I miss?

Thanky a lot!


## Accepted answer (score 1, by Lauri (OF) on 2021-10-13)

Link: https://openforis.support/questions/3258/calc-21-a19-not-starting/3260

Hello, there seems to be some issues with JDK 17 that we need to examine. Meanwhile, please use download and install JDK 8 [https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html][1] 
and search for file: jdk-8u73-windows-x64.exe 

regards, Lauri
  [1]: https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html


## Answer (score 0, by wexxo on 2021-10-13)

Link: https://openforis.support/questions/3258/calc-21-a19-not-starting/3263

Dear Lauri,

thanks a lot. I downgraded to JDK 8 and reinstalled Calc. It's working now.

Cheers!