Installing Javascript Transformation leads to "Internal Server Error"

[Skysurfer (Chris)]

Hi,
I’m busy to install and configurate the system and some parts are working. The binding to my knx-bus and binding to my yamaha avr.
But after installing Javascript Transformation from the Paper UI I always get an error “500-Internal Server Error” on Paper UI. And the HABPanel shows “Connection lost! Trying to reconnect…”

Restart doesn’t help. What can I do?

• Platform information:
  • Hardware: Raspberry Pi 3, 1 GByte
  • OS: openHAB 2.1.0-1 (Release Build)
  • Java Runtime Environment: which java platform is used and what version
  • openHAB version: 2.1

[rlkoshak (Rich Koshak)]

Clear the Cache

I got tired of retyping this so am posting a new thread I can link to later. Often when one encounters a problem with OH, particularly after an update, OH will refuse to run or certain parts of OH stop working. Some reported errors include: 500 or 404 errors when accessing the UIs lots of exceptions from Jetty or other core components in openhab.log OH refuses to start at all The first step in debugging the problem is to clear the tmp and cache. Stop OH if it is running. Delete the con…

I just typed this up. Come back here if clearing the cache and tmp doesn’t fix your problem.

[Skysurfer (Chris)]

Clear the Cache

I just typed this up. Come back here if clearing the cache and tmp doesn’t fix your problem.

I have now stopped OH, cleared the content of cache and tmp and started OH again:

sudo systemctl stop openhab2.service
(Cash cleared)
sudo systemctl start openhab2.service

The result is, that habpanel is not working and on PaperUI-Configuration-Items no item is displayed and “ERROR: 500 Internal Server Error” appears.

In openhab.log are no errors after startup. When Stopping, there are several errors like this:

2017-11-21 17:34:24.584 [hingStatusInfoChangedEvent] - 'astro:sun:local' changed from UNINITIALIZED to UNINITIALIZED (HANDLER_MISSING_ERROR)

Edit: ERROR 500 is a new error. Clearing the cache was the solution of “Internal Server Error”. Thanks!

[rlkoshak (Rich Koshak)]

I’m out of ideas. Usually clearing the cache will fix 500 errors, not cause them.

[wiewior (Jacek)]

I did the stop, celan and start -> did not help.
Now I need to go to manual clean but see following structure:

removing /cache folder and its content or only content?
removing /.cache as well?

Is it save?

[rlkoshak (Rich Koshak)]

Clear the Cache

Often when one encounters a problem with OH, particularly after an update, OH will refuse to run or certain parts of OH stop working. Some reported errors include: 500 or 404 errors when accessing the UIs lots of exceptions from Jetty or other core components in openhab.log OH refuses to start at all The first step in debugging the problem is to clear the tmp and cache. Installed OH If you are running an installed OH (openHABian, installed using apt or yum): openhab-cli stop openhab-cl…

[wiewior (Jacek)]

After several tries to clean the cache and few clean reboots I was forced to use my backup. The SD card was damaged probably. Coming back to the 2.4.x version and upgrading raspberry pi with all packages incl. grafana and openhab itself, system came to alive. Since couple of days it is running.
Thank you all for hints. Will use them definitively in future updates.