Hi everyone, I’m facing error while calling Ktor API `SLF4J: Failed to load class "org.slf4j.impl.S...

# ktor

[Ankit Dubey]

Hi everyone,
I’m facing error while calling Ktor API

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation

This error doesn’t come when i pass HashMap<String, String> to body
But whenever i’m passing, HashMap<String, Any>
then only getting error.

Any idea? Do I need to add SLF4J dependency🤔

[andylamax]

That error usually gets printed if you haven't added the slf4j dependency.

[andylamax]

It has nothing to do with your HashMap

[andylamax]

Also, it is just a warning. If you don't need such logging you can ignore it

[Ankit Dubey]

No It’s just not a warning.
I think API was not called due to this error.

[andylamax]

You say the error doesn't come when you pass a HasMap<String,String>, right. Pass that and loom at your console

[Ankit Dubey]

HashMap<String,String> is working fine for many APIs

Actually hashMap for some request had nested map also
So I needed HashMap<String, Any>

Anyhow , I replaced HashMap with one model class
And passing that class into request body
So working fine for now.

[Rustam Siniukov]

This log is printed by slf4j when there is no logging dependency found. It’s not related to you API. Add one of the required dependencies, for example ch.qos.logback:logback-classic:1.2.3 and you will see real error logs.