Failed to load class "org.slf4j.impl.StaticLoggerBinder"

leandroborges · December 16, 2020, 9:59pm

Hi

We are facing this issue when starting elasticsearch 7.6.2 with ROL 1.19.4. Any ideas?

Thank you very much.

Dec 16 11:51:02 SFAPR4853 elasticsearch[7369]: SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”.
Dec 16 11:51:02 SFAPR4853 elasticsearch[7369]: SLF4J: Defaulting to no-operation (NOP) logger implementation
Dec 16 11:51:02 SFAPR4853 elasticsearch[7369]: SLF4J: See SLF4J Error Codes for further details.

coutoPL · December 17, 2020, 5:21pm

if you see ROR logs, you can ignore it

leandroborges · December 17, 2020, 5:44pm

The problem is that the log4j2.properties configurations is ignored due to the NOP logger implementaiton.

coutoPL · December 17, 2020, 5:59pm

are you sure they are? because I saw this log somewhere and the logging works are expected.
If so, how to you run your ES? are you able to reproduce the same eg. using ES docker image?

leandroborges · December 17, 2020, 7:07pm

Hi.

Sorry, you are right. Even with the error message, I’m able to see elasticsearch logs. There was a misconfiguration inside the log properties file.

Thank you.

coutoPL · December 17, 2020, 8:34pm

I’m not sure why the misleading log appears because the logger implementation is there and is finally loaded. But we will try to remove it in future. At least it works, so we treat it as a low priority.

leandroborges · December 18, 2020, 2:10am

Hi

Could you explain exactly what “Defaulting to no-operation (NOP) logger implementation” means?

coutoPL · December 18, 2020, 3:50pm

it’s dummy implementation which does nothing (see link)