The BootstrapLogger class handles all the logic needed by Lazy Loggers to delay the creation of System.Logger instances until the VM is booted. By extension - it also contains the logic that will delay the creation of JUL Loggers until the LogManager is initialized by the application, in the common case where JUL is the default and there is no custom JUL configuration. A BootstrapLogger instance is both a Logger and a PlatformLogger.Bridge instance, which will put all Log messages in a queue until the VM is booted. Once the VM is booted, it obtain the real System.Logger instance from the LoggerFinder and flushes the message to the queue. There are a few caveat: - the queue may not be flush until the next message is logged after the VM is booted - while the BootstrapLogger is active, the default implementation for all convenience methods is used - PlatformLogger.setLevel calls are ignored