If you use a closure that capture some local variables and not a constant lambda, then you're right, the allocation will kill you. But, we are only using lambda

If you use a closure that capture some local variables and not a constant lambda, then you're right, the allocation will kill you. But, we are only using lambdas that do not capture anything so the lambda is allocated once by the VM. And we are using the new shiny System.Logger [1] so the VM logs and the application logs are interleaved. We still have some wrappers to redirect log4j logs on the system logger because few third party libs are compatible with the system logger. [1] https://docs.oracle.com/javase/9/docs/api/java/lang/System.Logger.html https://docs.oracle.com/javase/9/docs/api/java/lang/System.L...