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Q1111. in the following log4j config file, How should we change the file name and format

<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
<TimeBasedTriggeringPolicy />
</RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>

Log4j

Ans. We can specify the file name with fileName property within RollingFile. File name pattern for the rolled logs can be specified using filePattern property.

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Q1112. In the following log4j config, What if we don't need rolling logs

<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
<TimeBasedTriggeringPolicy />
</RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>

Log4j

Ans. We can change the appender from RollingFile to File or we can specify a new File appender and set that within AppenderRef

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Q1113. What are some of the Log4j appenders ?

Log4j

Ans. https://logging.apache.org/log4j/2.x/manual/appenders.html

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Q1114. Can you organize following Log4j levels in hierarchy ?

WARN, DEBUG,INFO, ERROR

Log4j

Ans. DEBUG
INFO
WARN
ERROR

Root Log level of DEBUG will print all
Root Log Level of INFO will print INFO, WARN and ERROR
Root Log level of WARN will print WARN and ERROR
Root Log level of ERROR will print ERROR alone

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Q1115. What are the application Logging levels specified in your applications ?

Log4j

Ans. In our Organization, the policy is to keep it WARN in production so as to reduce logging Noise. We use Info in Test environments.

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Q1116. What should be the logging level while logging exceptions ?

Log4j

Ans. It depends on how severe the exception is. If the exception is completely unexpected and breaks the request, It should be logged as ERROR or FATAL. If it's not expected but we can live with it and the application request continue in-spite of it, It should be WARN. If it's expected , it can be just INFO.

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Q1117. What is the difference between INFO and DEBUG logging levels ?

Log4j

Ans. Info Messages are something which we would like to see even if the application is in best of state. DEBUG messages are usually something that we would like to see while debugging some problem. DEBUG is lower level than Info. Any message logged with info gets printed if the Root level set is DEBUG.

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Q1118. What is the difference between DEBUG and TRACE logging levels ?

Log4j

Ans. TRACE designates finer grained informational events than the DEBUG.TRACE is level lower than DEBUG.

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Q1119. How to change the backup log directory using log4j ?

Log4j

Ans. There is a property called "filePattern" within appender that regulates where the backed up files will be created for rolling logs. It actually contains the absolute path which can be modified to have backed up logs within some other directory.

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Q1120. What does the property maxBackupIndex in Log4j means ?

Log4j

Ans. It means that the app will only maintain these many backed up log files. Older backed up logs will be deleted.

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Q1121. What is the use of Property files ?

Ans. Property files are used to maintain configurable values as key value pairs.

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Q1122. Explain bubble sort.

Algorithm

Ans. array is traversed from first element to last element. Here current element is compared with next element. If current element is greater than next element it is swapped.

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Q1123. Write code to check if a Binary tree is symmetrical

Algorithm

^{This question was recently asked at 'Amazon'.This question is still unanswered. Can you please provide an answer.}

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Q1124. Write a function that returns the depth of a tree.

Algorithm

^{This question was recently asked at 'Amazon'.This question is still unanswered. Can you please provide an answer.}

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Q1125. Write code to find the node where two linked lists intersect.

Algorithm

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Q1126. Check if tic tac toe has a winner

Algorithm

^{This question was recently asked at 'Microsoft'.This question is still unanswered. Can you please provide an answer.}

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Q1127. Write program to balance a binary tree

Algorithm

^{This question is still unanswered. Can you please provide an answer.}

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Q1128. Given a graph, find if it represents a tree

Algorithm

Ans. We can simply find it by checking the criteria of a tree. A tree will not contain a cycle, so if there is any cycle in the graph, it is not a tree. We can check it using another approach, if the graph is connected and it has V-1 edges, it could be a tree. Here V is the number of vertices in the graph

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Q1129. Explain different sorting algorithms and Big O of each

Algorithm

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Q1130. Write a program to find loop in a linked list

Algorithm

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Q1131. How to convert a bst to doubly linked list

Algorithm

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Q1132. What is a package management system ?

Tool

Ans. A package management system is a collection of software that automates the process of installing, upgrading and configuring an application.

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Q1133. What is RPM ?

Tool

Ans. Redhat Packaging system or rpm is a Package Manager or type of Package Management system extensively used for Linux systems.

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Q1134. What is Priority inversion ?

Operating System

Ans. Priority inversion is a problematic scenario in scheduling in which a high priority task is indirectly preempted by a lower priority task effectively inverting the relative priorities of the two tasks.

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Q1135. What is the difference between session.clear and session.evict ?

Hibernate

Ans. session.clear clears all the objects from session whereas session.evict is used for evicting a particular entity.

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Q1136. What is the use of Hibernate session.clear() ?

Hibernate

Ans. It is used to clear the session and is used to dissociate disconnect all the objects from the session.

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Q1137. If a company comes to you with a problem statement, how would you help provide a solution for it ?

General

^{This question was recently asked at 'UST Global'.This question is still unanswered. Can you please provide an answer.}

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Q1138. Difference between Include Directive and include action in jsp

Java EE

Ans. Include directive includes the file at translation time (the phase of JSP life cycle where the JSP gets converted into the equivalent servlet) whereas the include action includes the file at runtime.

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Q1139. Difference between import and include directive in jsp

Java EE

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Q1140. Difference between MultipartResolver setMaxUploadSize and setMaxUploadSizePerFile ?

Spring

Ans. setMaxUploadSize is used to set the maximum size of uploads that can be made in a request whereas setMaxUploadSizePerFile sets the maximum size per uploaded file.

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