Cron Job Java Servlet Interview

He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!

Cron job java servlet interview sample

You can also create a custom trigger by implementing the TriggerListener interface and define the triggerMisfired method. public void triggerMisfired(Trigger trigger); 1. 12. What are job stores? Job stores control how data is provided to the scheduler, jobs, and triggers. 13. What are different types of Job Stores? There are three different types of job stores provided by quartz; RAMJobStore, JDBCJobStore and TerracottaJobStore that provided persistent job data to quartz components. 14. How would you stop a running job? You can stop a running job by calling interrupt on the scheduler and providing the job key. The job that you are interrupting must implement the InterruptableJob interface. terrupt(()); 1. 15. What is the JobExecutionContext? The JobExecutionContext is passed to the execute method of an invoked job by the scheduler and it contains a handle to the scheduler, a handle to the trigger and the JobDetail. 16. Name a few of the bundled Jobs that quartz provides? A few of the jobs that quartz provides for users are FileScanJob, DirectoryScanJob, NativeJob, EJB3InvokerJob, SendQueueMessageJob, SendTopicMessageJob, JmxInvokerJob and SendMailJob.

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Please note cron created a temporary /tmp/] When you save the above temporary file with:wq, it will save the crontab and display the following message indicating the crontab is successfully modified. "XyjWkHw" 2L, 83C written crontab: installing new crontab Edit Root Crontab entries Login as root user (su – root) and do crontab -e as shown below. root@dev-db# crontab -e Edit Other Linux User's Crontab File entries To edit crontab entries of other Linux users, login to root and use -u {username} -e as shown below. root@dev-db# crontab -u sathiya -e @monthly /home/sathiya/fedora/bin/monthly-backup 00 09-18 * * * /home/sathiya/ubuntu/bin/check-db-status 6. Schedule a Job for Every Minute Using Cron. Ideally you may not have a requirement to schedule a job every minute. But understanding this example will will help you understand the other examples mentioned below in this article. * * * * * CMD The * means all the possible unit — i. e every minute of every hour through out the year. More than using this * directly, you will find it very useful in the following cases.

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Linux Crontab: Cron Job Examples In this article, let us review 15 awesome examples of crontab job scheduling. An experienced Linux sysadmin knows the importance of running the routine maintenance jobs in the background automatically. Linux Cron utility is an effective way to schedule a routine background job at a specific time and/or day on an on-going basis. Linux Crontab Format MIN HOUR DOM MON DOW CMD Table: Crontab Fields and Allowed Ranges (Linux Crontab Syntax) Field Description Allowed Value MIN Minute field 0 to 59 HOUR Hour field 0 to 23 DOM Day of Month 1-31 MON Month field 1-12 DOW Day Of Week 0-6 CMD Command Any command to be executed. 1. Scheduling a Job For a Specific Time The basic usage of cron is to execute a job in a specific time as shown below. This will execute the Full backup shell script (full-backup) on 10th June 08:30 AM. Please note that the time field uses 24 hours format. So, for 8 AM use 8, and for 8 PM use 20. 30 08 10 06 * /home/dinesh/full-backup 30 – 30th Minute 08 – 08 AM 10 – 10th Day 06 – 6th Month (June) * – Every day of the week 2.

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Linux crontab command is used to schedule cron jobs. A cron job is a handy automation tool that enables Linux users to execute automated tasks at specific periods or intervals. This is a friendly way of scheduling tasks which would otherwise be tedious if managed manually. Cron jobs are usually used by system administrators to automate tasks such as server backups, restarts, sending of notifications, and clean-ups to mention just but a few. A cron job runs silently in the background, checking the /etc/crontab file and /var/spool/cron and /etc/cron. */ directories. In this article, you will learn how to create and manage cron jobs in your Linux system. Linux Cron Job Structure The anatomy of a cron job is as shown below. * * * * * COMMAND arg1 arg2 OR * * * * * /path/to/script arg1 arg2 From the left, The 1st entry represents Minutes [0 - 59] The 2nd entry represents Hours [0 - 24] The 3rd entry represents Days [0 - 31] The 4th entry represents Months [0 - 12] The 5th entry represents Days of the week [0 - 7] Linux crontab Example Now that you have the skeleton for a crontab, writing one is quite easy provided you know the command or the path to your script.

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Today we will look into crontab example to execute a script every 5 minutes. Crontab example Recently I installed memcached server on CentOS operating system to use as a caching mechanism for my VBulletin forum. To make sure that it's running always, I wrote a shell script to check the process status and restart if it's not running. Now to make sure this script executes at a specific interval, I used crontab. Crontab Example Shell Script The shell script is extendable and you can write a similar script to restart any service or process in unix systems. Here is the shell script to auto restart service that I am using in my crontab example. #! /bin/bash ps -eaf | grep 11211 | grep memcached # if not found - equals to 1, start it if [ $? -eq 1] then /usr/local/bin/memcached -d -u nobody -p 11211 -U 11211 -l 127. 0. 1 else echo "eq 0 - memcached running - do nothing" fi The main command in this script is to check the process, use "ps" command with grep to make sure that it returns only the desired service and returns nothing if the service is not running.

Documentation on these jobs exists in the JavaDoc for the quartz-jobs-* 2. Conclusion You can find more information in the quartz Java docs or in the documentation on the quartz site,.

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getScheduler(); (); JobKey jobKey = new JobKey("jcgJobName", "group1"); JobDetail job = (). withIdentity(jobKey)(); heduleJob(job, trigger); 1. 3. How do I check the status of a running job? The JobListener will allow you to check the status of a running job. tListenerManager(). addJobListener(jcgJobListener, bKeyEquals(new JobKey("jcgJobName", "jcgJobGroup"))); 1. 4. How is the SimpleTrigger used? A SimpleTrigger is used for a single execution or an execution that repeated a specific number of times over a given interval. 5. How do I customize thread management? I set the thread pool class and corresponding thread pool properties that fall under The default thread pool is 1. 6. How is the CronTrigger used? The CronTrigger is used to execute a job using a cron expression. A cron expression is a notation that represents a second, minute, hour, day, month, or year as well as the ways to express special characters like wildcards or ranges for the schedule. 7. How do you store job state? The JobDataMap is used to store state that will be provided to the job when it executes.

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July 19, 2021, 5:21 am