JDK-8257429 : Release Note: Deprecated Tracing Flags Are Obsolete and Must Be Replaced With Unified Logging Equivalents
  • Type: Sub-task
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 16
  • Priority: P4
  • Status: Closed
  • Resolution: Delivered
  • Submitted: 2020-11-30
  • Updated: 2021-12-03
  • Resolved: 2021-12-03
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JDK 16
16Resolved
Description
When Unified Logging was added in Java 9, a number of tracing flags were deprecated and mapped to their unified logging equivalent. These flags are now obsolete and will no longer be converted automatically to enable unified logging. To continue getting the same logging output, you must explicitly replace the use of these flags with their unified logging equivalent.

| Obsoleted Option | Unified Logging Replacement |
| ------------------------ | --------------------------- |
| -XX:+TraceClassLoading | -Xlog:class+load=info |
| -XX:+TraceClassUnloading | -Xlog:class+unload=info |
| -XX:+TraceExceptions | -Xlog:exceptions=info |
Comments
Added markdown table. Not sure if spacing will be preserved correctly.
06-12-2020
I suggest adding some historical context here. "When Unified Logging was added in Java 9, a number of tracing flags were deprecated and mapped to their unified logging equivalent. These flags are now obsolete and will no longer be converted automatically to enable unified logging. To continue getting the same logging output you must replace the use of these flags with their unified logging equivalent yourself." Also the RN title needs to be something more explicit e.g. "Old tracing flags are now obsolete and must be replaced with unified logging"
30-11-2020