Spring batch repository setup

You can have different input data sources or you can also load the data from file to file with various data processing rules. There are also ways to automate these jobs and process a high volume of data in a performant manner. In this post, I showed a step by step Spring Batch Tutorial. There are many ways to handle batch jobs, but Spring Batch has made this very easy. In other news, I recently released my new book — Simplifying Spring Security. If you are looking to learn about Spring Security, you can buy the book here.

Accompany this book with this post of Spring Boot Interview questions and you will be ready for your next job interview. What is Spring Batch?

What is Batch Processing? Next, we will learn about the Spring Batch framework and what it comprises. Spring Batch Framework The following architecture shows the components of the Spring Batch framework. Spring Batch framework also includes logging and tracing transaction management job processing statistics job restart resource management Usually, when you configure a job, it will be saved in the job repository.

So to start with, create the spring project and add the following dependency: implementation 'org. Also out main application will look like below: package com. SpringApplication; import org. Company; import com. Employee; import com. CompanyRepository; import org. Autowired; import java. Setting up Spring Batch Configuration Now, we will set up a batch configuration for our job that will run to upload a CSV file into the database.

EmployeeDto; import org. FieldSetMapper; import org. FieldSet; import org. Component; import org. JobCompletionListener checks for job completion status.

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Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. In this tutorial, we will try to understand configuring Job, JobRepository , JobLauncher , and how to run a batch Job from the command line.

A JobBuilderFactory builder design pattern abstracts this implementation and returns a Job object. The Job and steps inside it will require a JobRepository.

JobRepository in Spring batch takes care of all the CRUD create, read, update, and delete operations and ensures persistence. It does this for JobLauncher, Job, and Step. We know that when we launch a Job, it will create a JobInstance and it will have a JobExecution exist for it. In an ideal world, any job should be able to start from where it left off; in simple words, the job must maintain the state.

It is up to the developer and designer to decide this behavior. If they wish, they can control this behavior while creating the JobInstance. We can control this restart-able behavior using preventRestart property in the JobBuilderFactory. We can intercept the JobExecution to get notified of the various events in its life-cycle and once we do that, we can write our custom logic.

We do this by using JobExecutionListener interface. This interface has two methods beforeJob and afterJob. We can add a JobListener to our JobInstance while creating it. Please note that afterJob will be invoked irrespective of JobExecution status.

If we wish to write a custom code based on these statuses, we can do so in this listener class. Please have a look at the code below to understand it further. When we make an instance of Job interface using AbstractJob implementation, we have an option to declare and define a validator for JobParameters. This is useful when we want to ensure that Job is getting started with all the mandatory and required parameters.

In the code below you can see that we are using the JobBuilderFactory and declaring a validator within it.

When we use annotation EnableBatchProcessing in our main spring boot class , it provides a JobRepository to us. There might be a situation where we want to configure our JobRepository.