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kotlinlang

hi there. Has anyone bumped kotlin to 1.4  in SB project already?  :smiley:

we tried but we're relying on KtLint to be compatible first :+1:

```Failed to instantiate [org.springframework.security.web.server.SecurityWebFilterChain]: Factory method 'securityWebFilterChain' threw exception; nested exception is java.lang.NoSuchMethodError: kotlin.jvm.internal.FunctionReferenceImpl.&lt;init&gt;(ILjava/lang/Class;Ljava/lang/String;Ljava/lang/String;I)V```

Adding this to `build.gradle.kts` helps:
```extra["kotlin.version"] = "1.4.0"```

Boot 2.4.0-M3 will use Kotlin 1.4 by default 

We use kotlin 1.4.0 now and we just had to include the kotlin plugin at 1.4.0, so far everything works for us :slightly_smiling_face:

Great to know thanks for sharing. I think you should also set `kotlin.version` to 1.4.0 as shown above in addition to the plugin to make Boot dependency management aware.

I will have a look into that, thanks :slightly_smiling_face: