Flogger uses withCause(exception) to associate Exceptions with log statements. Passing exceptions directly to log() only records the name and message, and loses the stack trace.

logger.atWarning().log("Unexpected exception: %s", e);

logger.atWarning().withCause(e).log("Unexpected exception");

If you intended not to log the stack trace or other parts of the exception, you should explicitly log the parts you want to keep so the intent is clear in the code:

// Avoid withCause() since stack traces are unnecessary here
logger.atWarning().log("Unexpected exception [%s]: %s", e.getClass(), e.getMessage());