[KARAF-7829] SLF4J Warnings on Client-Connection

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 4.4.6
• Fix Version/s: 4.4.7
• Component/s: karaf
• Assignee: Jean-Baptiste Onofré
• Reporter: Niklas Neesen
• Created: 27/May/24 14:30
• Updated: 05/Jul/24 09:52

Description

I have encountered several SLF4J warnings when connecting using the ./bin/client command in Apache Karaf version 4.4.6. The following warnings are displayed at the beginning of the connection:

SLF4J(W): No SLF4J providers were found.
SLF4J(W): Defaulting to no-operation (NOP) logger implementation
SLF4J(W): See https://www.slf4j.org/codes.html#noProviders for further details.
SLF4J(W): Class path contains SLF4J bindings targeting slf4j-api versions 1.7.x or earlier.
SLF4J(W): Ignoring binding found at [jar:file:/Users/niklas/Downloads/apache-karaf-4.4.6/system/org/apache/karaf/org.apache.karaf.client/4.4.6/org.apache.karaf.client-4.4.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J(W): See https://www.slf4j.org/codes.html#ignoredBindings for an explanation.

Steps to Reproduce:

1. Download and extract Apache Karaf version 4.4.6.
2. Navigate to the extracted directory.
3. Start Karaf using the command ./bin/start.
4. Use the command ./bin/client to connect.

 

Expected Behavior:
No SLF4J warnings should be displayed during the connection process.

 

Actual Behavior:
Multiple SLF4J warnings are displayed, indicating issues with SLF4J provider bindings and defaulting to a no-operation logger implementation.

 

Environment:

• Apache Karaf version: 4.4.6
• Java version: OpenJDK 11.0.22

Please investigate this issue and provide guidance on how to resolve the SLF4J warnings.

Thank you.