Log4j - Formatting Layouts

Log4j - File Appenders

log4j Resources

log4j Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to log4j Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Q 1 - Which of the following is correct about log4j?

A - The target of the log output as well as the writing strategy can be altered by implementations of the Appender interface.

B - It is fail-stop.

C - log4j does not guarantee that each log statement will be delivered to its destination.

D - All of the above.

Answer : D

Explanation

All of the above options are correct.

Q 2 - Which of the following is correct about ObjectRenderer object?

A - The ObjectRenderer object is specialized in providing a String representation of different objects passed to the logging framework.

B - This object is used by Layout objects to prepare the final logging information.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 3 - Which of the following method of logger print a log message in trace mode?

A - public void warn(Object message)

B - public void trace(Object message)

C - public void fatal(Object message)

D - public void info(Object message)

Answer : B

Explanation

public void trace(Object message) of Logger class prints messages with the level Level.TRACE.

Q 4 - Which of the following level is intended to turn off logging?

Answer : A

Explanation

OFF − The highest possible rank and is intended to turn off logging.

Q 5 - What is the purpose of d character used in the conversionPattern of PatternLayout object?

A - Used to output the category of the logging event.

B - Used to output the fully qualified class name of the caller issuing the logging request.

C - Used to output the date of the logging event.

D - Used to output the file name where the logging request was issued.

Answer : C

Explanation

d − Used to output the date of the logging event. For example, %d{HH:mm:ss,SSS} or %d{dd MMM yyyy HH:mm:ss,SSS}.

Q 6 - What is the purpose of X character used in the conversionPattern of PatternLayout object?

A - Used to output the NDC (nested diagnostic context) associated with the thread that generated the logging event.

B - Used to print the information stored in the MDC against the key.

C - Used to print a % sign.

D - Used to Left pad with spaces if the category name is less than 20 characters long.

Answer : B

Explanation

X − The X conversion character is followed by the key for the MDC. For example, X{clientIP} will print the information stored in the MDC against the key clientIP.

Q 7 - What is the purpose of immediateFlush configuration of FileAppender?

A - output stream to the file being flushed with each append operation.

B - to set the platform-specific encoding scheme.

C - to set the threshold level for this appender.

D - to set the name of the log file.

Answer : A

Explanation

immediateFlush − This flag is by default set to true, which means the output stream to the file being flushed with each append operation.

Q 8 - What is the purpose of maxFileSize configuration of RollingFileAppender?

A - to set the critical size of the file above which the file will be rolled.

B - to set the number of backup files to be created.

C - Both of the above.

D - None of the above.

Answer : A

Explanation

maxFileSize − This is the critical size of the file above which the file will be rolled.

Q 9 - What is the purpose of user configuration of JDBCAppender?

A - to set the jdbc URL.

B - to set the database user name.

C - to specify the SQL statement to be executed every time a logging event occurs.

D - None of the above.

Answer : B

Explanation

user − Sets the database user name.

Q 10 - The Logger object is responsible for publishing logging information to various preferred destinations such as a database, file, console, UNIX Syslog, etc.

A - true

B - false

Answer : B

Explanation

false − The Appender object is responsible for publishing logging information to various preferred destinations such as a database, file, console, UNIX Syslog, etc.

log4j_questions_answers.htm