The function
ClassLoader::print_counters()

called from
https://github.com/openjdk/jdk/blob/3fab8e37bbebbb3930108b2015efe488b1fa1e97/src/hotspot/share/runtime/java.cpp#L362
with
 ClassLoader::print_counters(tty);

and prints output to tty.

inside it checks
https://github.com/openjdk/jdk/blob/3fab8e37bbebbb3930108b2015efe488b1fa1e97/src/hotspot/share/classfile/classLoader.cpp#L142

`if (log_is_enabled(Info, perf, class, link)) {`

and print if logging is enabled.

Thus if log is redirected into file the data is printed into output which is inconsistent.


The example:
java -Xlog:all=trace:file=vm-%p.log::filecount=1,filesize=1 -version

OpenJDK 64-Bit Server VM warning: dependency logging results may be inflated by VerifyDependencies
OpenJDK 64-Bit Server VM warning: class load cause logging will not produce output without LogClassLoadingCauseFor
Could not rename log file 'vm-1108972.log' to 'vm-1108972.log.0' (No such file or directory).
openjdk version "24-internal" 2025-03-18
OpenJDK Runtime Environment (fastdebug build 24-internal-adhoc.lmesnik.open)
OpenJDK 64-Bit Server VM (fastdebug build 24-internal-adhoc.lmesnik.open, mixed mode)
ClassLoader:
  clinit: 6885ms / 768 events
  link methods: 24ms / 14070 events
  method adapters: 21ms / 654 events
  resolve...
    invokedynamic: 4123ms / 17 events
    invokehandle: 86ms / 11 events
    CP_MethodHandle: 2892ms / 25 events
    CP_MethodType: 7ms / 29 events