How to view Dimmer state in OH2 console?

Setup, Configuration and Use Beginners
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1

How to view Dimmer state in OH2 console?

rule "test_DimmedZal2"

when

	Item DimmedZal2 changed

then

	logInfo("Dimm", DimmedZal2)

end

This listing does not output information in OpenHabian console.
Outputed error when changing slider state:
2017-02-24 12:32:32.856 [ERROR] [.script.engine.ScriptExecutionThread] - Rule 'RULE_Dimmer_DimmedZal2': An error occured during the script execution: Could not invoke method: org.eclipse.smarthome.model.script.actions.LogAction.logInfo(java.lang.String,java.lang.String,java.lang.Object[]) on instance: null

In http://192.168.1.3:8080/rest/items/DimmedZal2 state changes

2

logInfo(“Dimm”, DimmedZal2.state.toString)

3

Thanx.
But when I change slider state by mouse (just one click) in log written:
2017-02-24 13:40:46.367 [INFO ] [thome.io.rest.core.item.ItemResource] - Received HTTP POST request at ‘items/DimmedZal2’ for the unknown item ‘DimmedZal2’.
2017-02-24 13:40:46.586 [INFO ] [thome.io.rest.core.item.ItemResource] - Received HTTP POST request at ‘items/DimmedZal2’ for the unknown item ‘DimmedZal2’.

And where is slider value?

4

I don’t know. People who have seen errors like that after editing have found the error go away after an OpenHAB restart.

5

Oh! Tnx! Rebooting don’t print this INFO-error and print slider value

6

Could you tell? How to restart OpenHab service without restarting openHabian?

7

I do not know, I do not use Openhabian.

A search throws up a restart method here

8

Tnx! In your link I get answer!
To restart OpenHab service work command: systemctl restart openhab2.service