Here is an example of how to use the RecoveryCoordinator class from the logback library to handle errors in appenders:

import ch.qos.logback.core.recovery.ResilientFileOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyApp {
    public static void main(String[] args) {
        // create a new logger
        Logger logger = LoggerFactory.getLogger("MyApp");

        // create a new FileAppender
        FileAppender<ILoggingEvent> fileAppender = new FileAppender<>();
        fileAppender.setFile("mylog.log");

        // create a new RecoveryCoordinator
        RecoveryCoordinator recoveryCoordinator = new RecoveryCoordinator();

        // create a new ResilientFileOutputStream
        ResilientFileOutputStream resilientOutputStream = new ResilientFileOutputStream("mylog.log", true);

        // set the RecoveryCoordinator for the FileAppender
        fileAppender.setOutputStream(resilientOutputStream);
        fileAppender.setRecoveryCoordinator(recoveryCoordinator);

        // start the FileAppender
        fileAppender.start();

        // add the FileAppender to the logger
        logger.addAppender(fileAppender);

        // log some messages
        logger.debug("Debug message");
        logger.info("Info message");
        logger.warn("Warning message");
        logger.error("Error message");
    }
}

In this example, the RecoveryCoordinator class is used in conjunction with the ResilientFileOutputStream class to handle errors that occur while writing log messages to a file.

The RecoveryCoordinator class is used to determine whether the appender should attempt to recover from an error and continue logging or stop logging.

The ResilientFileOutputStream class is used to handle errors that occur while writing log messages to a file. It attempts to recover from errors by retrying the write operation a certain number of times before giving up.

This way, it makes sure that logs are written to the file even in case of errors which otherwise could cause loss of logs.

Please note that, the example provided here is an indicative one, the actual implementation and usage of RecoveryCoordinator class might vary based on the specific use case.