Logging to other client's file

[Donutellko]

Hello.
I have two Feign clients in a Spring Boot project, they are both configured like this (Kotlin):

@Configuration
class FirstConfig {
    @Bean
    fun getFirstClient(): FirstClient {
        return Feign.builder()
                .logger(Logger.JavaLogger().appendToFile("logs/first.log"))
                .logLevel(Logger.Level.FULL)
                .decoder(JacksonDecoder())
                .encoder(JacksonEncoder())
                .target(FirstClient::class.java, "...")
    }
}

And similarly for SecondClient and second.log (all the names are changed).

The issue is that I get two log files mixed. Something like that:
logs/second.log:

[FirstClient#someMethod] ---> GET http://.../... HTTP/1.1
...
[FirstClient#someMethod] <--- END HTTP (3629-byte body)
[SecondClient#otherMethod] ---> POST https://.../... HTTP/1.1
...
[SecondClient#send] ---> END HTTP (767-byte body)
[FirstClient#oneMoreMethod] ---> GET http://.../... HTTP/1.1
...

And the second.log is full of FirstClient's logs and vice versa. diff says the files are almost identical, but not completely -- two or three logs from first client does not appear in second's file.

I use version 10.1.0:

dependencies {
    compile 'io.github.openfeign:feign-core:10.1.0'
    compile 'io.github.openfeign:feign-jackson:10.1.0'
    ...

Thank you.

[Donutellko]

I found that the problem is caused by 165th line in feign\Logger.java:
logger = java.util.logging.Logger.getLogger(Logger.class.getName());
So this method returns the same object for both instances of feign\JavaLogger.java. Would the change of an identifier be an appropriate solution?

[dharmeshjogadia]

Hey @Donutellko
I have one suggestion here to solve this problem, rather than using the default constructor of feign\JavaLogger.java we can introduce constructor with a parameter name or class. Something like
public JavaLogger(Class<?> clazz) and public JavaLogger(String name). what do you thing @kdavisk6 ?