import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class MyClass { private static final Log log = LogFactory.getLog(MyClass.class); public void myMethod() { if (log.isErrorEnabled()) { log.error("An error occurred in my method."); } } }In this example, we have created a new instance of the Log interface using the LogFactory.getLog() method. We are then calling the isErrorEnabled() method to check if error level logging is enabled for this Log instance. If it is, then we are logging an error message using the log.error() method. Overall, the org.apache.commons.logging package library is a versatile and useful tool for logging events in a Java application. By using the isErrorEnabled() method, you can easily check if error level logging is enabled before logging an error message, which can help improve the efficiency of your code.