{"id":76668,"date":"2018-05-15T22:00:47","date_gmt":"2018-05-15T19:00:47","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=76668"},"modified":"2018-05-15T12:39:45","modified_gmt":"2018-05-15T09:39:45","slug":"java-batch-tutorial","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2018\/05\/java-batch-tutorial.html","title":{"rendered":"Java Batch Tutorial"},"content":{"rendered":"<p>In today&#8217;s world internet has changed the way we live our lives and one of the major reasons for that is the usage of internet for most of the daily chores. This lead to huge amount of data available for processing.<\/p>\n<p>Some of the examples where huge data is involved are processing payslips, bank statements, interest calculation, etc. So imagine if all these jobs had to be done manually, it will take ages to finish these jobs.<\/p>\n<p>How is it done in current age? The answer is <strong>Batch Processing.<\/strong><\/p>\n<h2>1. Introduction<\/h2>\n<p>Batch processing is performed on bulk data, without manual intervention, and long-running. It might be data or computation-intensive. Batch jobs can be run on predefined schedule or can be initiated on demand. Also, since batch jobs are usually long-running jobs, constant checks and restarting from a certain failure are common features found in batch jobs.<\/p>\n<h3>1.1 History of Java Batch Processing<\/h3>\n<p>Batch processing for Java Platform was introduced as part of JSR 352 specification, part of the Java EE 7 platform, defines the programming model for batch applications plus a runtime to run and manage batch jobs.<\/p>\n<h3>1.2 Architecture of Java Batch<\/h3>\n<p>Below diagram shows the basic components for batch processing.<\/p>\n<p><figure id=\"attachment_76819\" aria-describedby=\"caption-attachment-76819\" style=\"width: 738px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/java_batch_archt_JCG.jpg\"><img decoding=\"async\" class=\"size-full wp-image-76819\" src=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/java_batch_archt_JCG.jpg\" alt=\"\" width=\"738\" height=\"294\" srcset=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/java_batch_archt_JCG.jpg 738w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/java_batch_archt_JCG-300x120.jpg 300w\" sizes=\"(max-width: 738px) 100vw, 738px\" \/><\/a><figcaption id=\"caption-attachment-76819\" class=\"wp-caption-text\">Architecture for Java Batch Processing<\/figcaption><\/figure><\/p>\n<p>The architecture for batch applications solves batch processing concerns like jobs, steps, repositories, reader processor writer patterns, chunks, checkpoints, parallel processing, flow, retries, sequencing, partitioning, etc.<\/p>\n<p>Let&#8217;s understand the flow of architecture.<\/p>\n<ul>\n<li>Job repository contains the jobs that need to be run.<\/li>\n<li><code>JobLauncher<\/code> pulls out a job from Job repository.<\/li>\n<li>Every job contains steps. The steps are <code>ItemReader<\/code>, <code>ItemProcessor<\/code> and <code>ItemWriter<\/code>.<\/li>\n<li>Item Reader is the one which read the data.<\/li>\n<li>Item Process is the one that will process the data based on business logic.<\/li>\n<li>The Item writer will write the data back to the defined source.<\/li>\n<\/ul>\n<h3>1.3 Batch Processing Components.<\/h3>\n<p>We will now try to understand the batch processing components in detail.<\/p>\n<ul>\n<li><strong>Job:\u00a0<\/strong>A job comprises the entire batch process. It contains one or more steps. A job is put together using a Job Specification Language (JSL) that specifies the order in which the steps must be executed. In JSR 352, JSL is specified in an XML file known as the job XML file. A job is basically a container holding steps.<\/li>\n<li><strong>Step:\u00a0<\/strong>A step is a domain object that contains an independent, sequential phase of the job. A step contains all the necessary logic and data to perform the actual processing. The definition of a step is kept vague as per the batch specification because the content of a step is purely application-specific and can be as complex or simple as the developer wants. There are two kinds of steps: <strong>chunk and task oriented<\/strong>.<\/li>\n<li><strong>Job Operator:<\/strong> It\u00a0provides an interface to manage all aspects of job processing, which includes operational commands, such as start, restart, and stop, as well as job repository commands, like retrieval of job and step executions.<\/li>\n<li><strong>Job Repository:\u00a0<\/strong>It contains information about jobs currently running and historical data about the job. <code>JobOperator<\/code> provides APIs to access this repository. A <code>JobRepository<\/code> could be implemented using, a database or a file system.<\/li>\n<\/ul>\n<p>The following section will help in understanding some common characters of a batch architecture.<\/p>\n<h3>1.3 Steps in Job<\/h3>\n<p>A Step is an independent phase of a Job. As discussed above, there are two types of steps in a Job. We will try to understand both the types in detail below.<\/p>\n<h4>1.3.1 Chunk-Oriented Steps<\/h4>\n<p>Chunk steps will read and process one item at a time and group the results into a chunk. The results are then stored when the chunk reaches a predefined size. Chunk-oriented processing makes storing results more efficient when the data set is huge. It contains three parts.<\/p>\n<ul>\n<li>The item reader reads the input one after the other from a data source which can be a database, flat file, log file, etc.<\/li>\n<li>The processor will process the data one by one based on the business logic defined.<\/li>\n<li>A writer writes the data in chunks. Size of the chunk is predefined and is configurable<\/li>\n<\/ul>\n<p>As part of chunk steps, there are checkpoints which provide information to the framework for the completion of chunks. If there is an error during a chunk processing the process can restart based on the last checkpoint.<\/p>\n<h4>1.3.2 Task-Oriented Steps<\/h4>\n<p>It executes task other than processing items from a data source. Which includes creation or removal of directories, moving files, creating or deletion of database tables, etc. Task steps are not usually long-running compared to chunk steps.<\/p>\n<p>In a normal scenario, task-oriented steps are used after chunk-oriented steps where there is a clean-up needed. For example, we get log files as an output of an application. The chunk steps are used for processing the data and get meaningful information out of the log files.<\/p>\n<p>The task step is then used to clean-up older log files which are no more needed.<\/p>\n<h4>1.3.3 Parallel Processing<\/h4>\n<p>Batch jobs often perform expensive computational operations and process large amounts of data. Batch applications can benefit from parallel processing in two scenarios.<\/p>\n<ul>\n<li>Steps that are independent in nature can run on different threads.<\/li>\n<li>Chunk-oriented steps where the processing of each item is independent of the results of processing previous items can run on more than one thread.<\/li>\n<\/ul>\n<p>Batch processing helps to finish tasks and perform operations faster for huge data.<\/p>\n<h2>2. Tools and Technologies<\/h2>\n<p>Let us look at the technologies and tool used for building the program.<\/p>\n<ul>\n<li>Eclipse\u00a0Oxygen.2 Release (4.7.2)<\/li>\n<li>Java \u2013 version 9.0.4<\/li>\n<li>Gradle\u2013 4.3<\/li>\n<li>Spring boot \u2013 2.0.1-Release<\/li>\n<li>HSQL Database<\/li>\n<\/ul>\n<h2>3. Project Structure<\/h2>\n<p>The project structure will look as shown in the image below.<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<p><figure id=\"attachment_76829\" aria-describedby=\"caption-attachment-76829\" style=\"width: 464px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/project_structure_JCG.jpg\"><img decoding=\"async\" class=\"size-full wp-image-76829\" src=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/project_structure_JCG.jpg\" alt=\"\" width=\"464\" height=\"540\" srcset=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/project_structure_JCG.jpg 464w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/project_structure_JCG-258x300.jpg 258w\" sizes=\"(max-width: 464px) 100vw, 464px\" \/><\/a><figcaption id=\"caption-attachment-76829\" class=\"wp-caption-text\">Project Structure for Java Batch<\/figcaption><\/figure><\/p>\n<p>The above project structure is using Gradle. This project can also be created using maven and the build.gralde will get replaced with pom.xml file. The structure of the project will defer slightly with the usage of Maven for the build.<\/p>\n<h2>4. An objective of the Program<\/h2>\n<p>As part of the program, we will try to create a simple java batch application using spring boot. This application will perform the following tasks.<\/p>\n<ol>\n<li><strong>Read: &#8211;<\/strong> Read employee data from a CSV file.<\/li>\n<li><strong>Process the data: &#8211;\u00a0<\/strong>Convert the employee data into all upper case.<\/li>\n<li><strong>Write: &#8211; <\/strong>Write the processed employee data back in the database.<\/li>\n<\/ol>\n<h3>4.1 Gradle build<\/h3>\n<p>We are using Gradle for the build as part of the program. The\u00a0<code>build.gradle<\/code>\u00a0file will look as shown below.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>build.gradle<\/em><\/span><\/p>\n<pre class=\"brush:bash\">buildscript {\r\n    repositories {\r\n        mavenCentral()\r\n    }\r\n    dependencies {\r\n        classpath(\"org.springframework.boot:spring-boot-gradle-plugin:2.0.1.RELEASE\")\r\n    }\r\n}\r\n\r\napply plugin: 'java'\r\napply plugin: 'eclipse'\r\napply plugin: 'idea'\r\napply plugin: 'org.springframework.boot'\r\napply plugin: 'io.spring.dependency-management'\r\n\r\nbootJar {\r\n    baseName = 'java-batch'\r\n    version =  '1.0'\r\n}\r\n\r\nrepositories {\r\n    mavenCentral()\r\n}\r\n\r\nsourceCompatibility = 1.8\r\ntargetCompatibility = 1.8\r\n\r\ndependencies {\r\n    compile(\"org.springframework.boot:spring-boot-starter-batch\")\r\n    compile(\"org.hsqldb:hsqldb\")\r\n    testCompile(\"junit:junit\")\r\n}\r\n<\/pre>\n<p>In the above\u00a0<code>build.gradle<\/code>\u00a0file\u00a0<code>apply plugin: 'java'<\/code>\u00a0tells us the plugin that needs to be set. For us, it is Java plugin.<br \/>\n<code>repositories{}<\/code>\u00a0lets us know the repository from which the dependency should be pulled. We have chosen\u00a0<code>mavenCentral<\/code>\u00a0to pull the dependency jars. We can use\u00a0<code>jcenter<\/code>\u00a0also for pulling the respective dependency jars.<\/p>\n<p><code>dependencies {}<\/code>\u00a0tag is used to provide necessary jar file details that should be pulled for the project. <code>apply plugin: 'org.springframework.boot'<\/code> this plugin is used for specifying a spring-boot project. <code>boot jar{}<\/code> will specify the properties of the jar that will get generated from the build.<\/p>\n<h3>4.2 Sample data file<\/h3>\n<p>In order to provide data for the read phase, we will use a CSV file containing employee data.<\/p>\n<p>The file will look as shown below.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>Sample CSV file<\/em><\/span><\/p>\n<pre class=\"brush:bash\">John,Foster\r\nJoe,Toy\r\nJustin,Taylor\r\nJane,Clark\r\nJohn,Steve<\/pre>\n<p>The sample data file contains the first and last name of the employee. We will use the same data for processing and then insertion in the database.<\/p>\n<h3>4.3 SQL scripts<\/h3>\n<p>We are using HSQL database which is a memory based database. The script will look as shown below.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>SQL script<\/em><\/span><\/p>\n<pre class=\"brush:sql\">DROP TABLE employee IF EXISTS;\r\n\r\nCREATE TABLE employee  (\r\n    person_id BIGINT IDENTITY NOT NULL PRIMARY KEY,\r\n    first_name VARCHAR(20),\r\n    last_name VARCHAR(20)\r\n);<\/pre>\n<p>Spring Boot runs\u00a0<code>schema-@@platform@@.sql<\/code>\u00a0automatically when it starts.\u00a0<code>-all<\/code>\u00a0is the default for all platforms. So the table creation will happen on its own when the application starts and it will be available until the application is up and running.<\/p>\n<h3>4.4 Model Class<\/h3>\n<p>We are going to create an\u00a0<code>Employee.java<\/code>\u00a0class as the model class. The class will look as shown below.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>Model Class for the Program<\/em><\/span><\/p>\n<pre class=\"brush:java\">package com.batch;\r\n\r\npublic class Employee {\r\n\t    private String lastName;\r\n\t    private String firstName;\r\n\r\n\t    public Employee() {\r\n\t    }\r\n\r\n\t    public Employee(String firstName, String lastName) {\r\n\t        this.firstName = firstName;\r\n\t        this.lastName = lastName;\r\n\t    }\r\n\r\n\t    public void setFirstName(String firstName) {\r\n\t        this.firstName = firstName;\r\n\t    }\r\n\r\n\t    public String getFirstName() {\r\n\t        return firstName;\r\n\t    }\r\n\r\n\t    public String getLastName() {\r\n\t        return lastName;\r\n\t    }\r\n\r\n\t    public void setLastName(String lastName) {\r\n\t        this.lastName = lastName;\r\n\t    }\r\n\r\n\t    @Override\r\n\t    public String toString() {\r\n\t        return \"firstName: \" + firstName + \", lastName: \" + lastName;\r\n\t    }\r\n\r\n\t}\r\n\r\n<\/pre>\n<p><code>@Override<\/code> is used for overriding the default implementation of the <code>toString()<\/code> method.<\/p>\n<h3>4.5 Configuration Class<\/h3>\n<p>We will create a <code>BatchConfiguration.java<\/code> class which will be the configuration class for batch processing. The java file will look as shown below.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>BatchConfiguration.java<\/em><\/span><\/p>\n<pre class=\"brush:java\">package com.batch.config;\r\n\r\nimport javax.sql.DataSource;\r\n\r\nimport org.springframework.batch.core.Job;\r\nimport org.springframework.batch.core.JobExecutionListener;\r\nimport org.springframework.batch.core.Step;\r\nimport org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;\r\nimport org.springframework.batch.core.configuration.annotation.JobBuilderFactory;\r\nimport org.springframework.batch.core.configuration.annotation.StepBuilderFactory;\r\nimport org.springframework.batch.core.launch.support.RunIdIncrementer;\r\nimport org.springframework.batch.item.database.BeanPropertyItemSqlParameterSourceProvider;\r\nimport org.springframework.batch.item.database.JdbcBatchItemWriter;\r\nimport org.springframework.batch.item.database.builder.JdbcBatchItemWriterBuilder;\r\nimport org.springframework.batch.item.file.FlatFileItemReader;\r\nimport org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder;\r\nimport org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper;\r\nimport org.springframework.batch.item.file.mapping.DefaultLineMapper;\r\nimport org.springframework.batch.item.file.transform.DelimitedLineTokenizer;\r\nimport org.springframework.beans.factory.annotation.Autowired;\r\nimport org.springframework.context.annotation.Bean;\r\nimport org.springframework.context.annotation.Configuration;\r\nimport org.springframework.core.io.ClassPathResource;\r\nimport org.springframework.jdbc.core.JdbcTemplate;\r\n\r\nimport com.batch.Employee;\r\nimport com.batch.processor.EmployeeItemProcessor;\r\n\r\n@Configuration\r\n@EnableBatchProcessing\r\npublic class BatchConfiguration {\r\n\r\n    @Autowired\r\n    public JobBuilderFactory jobBuilderFactory;\r\n\r\n    @Autowired\r\n    public StepBuilderFactory stepBuilderFactory;\r\n\r\n    \/\/ tag::readerwriterprocessor[]\r\n    @Bean\r\n    public FlatFileItemReader reader() {\r\n        return new FlatFileItemReaderBuilder()\r\n            .name(\"EmployeeItemReader\")\r\n            .resource(new ClassPathResource(\"sample-data.csv\"))\r\n            .delimited()\r\n            .names(new String[]{\"firstName\", \"lastName\"})\r\n            .fieldSetMapper(new BeanWrapperFieldSetMapper() {{\r\n                setTargetType(Employee.class);\r\n            }})\r\n            .build();\r\n    }\r\n\r\n    @Bean\r\n    public EmployeeItemProcessor processor() {\r\n        return new EmployeeItemProcessor();\r\n    }\r\n\r\n    @Bean\r\n    public JdbcBatchItemWriter writer(DataSource dataSource) {\r\n        return new JdbcBatchItemWriterBuilder()\r\n            .itemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider&lt;&gt;())\r\n            .sql(\"INSERT INTO employee (first_name, last_name) VALUES (:firstName, :lastName)\")\r\n            .dataSource(dataSource)\r\n            .build();\r\n    }\r\n    \/\/ end::readerwriterprocessor[]\r\n\r\n    \/\/ tag::jobstep[]\r\n    @Bean\r\n    public Job importUserJob(JobCompletionNotificationListener listener, Step step1) {\r\n        return jobBuilderFactory.get(\"importUserJob\")\r\n            .incrementer(new RunIdIncrementer())\r\n            .listener(listener)\r\n            .flow(step1)\r\n            .end()\r\n            .build();\r\n    }\r\n\r\n    @Bean\r\n    public Step step1(JdbcBatchItemWriter writer) {\r\n        return stepBuilderFactory.get(\"step1\")\r\n            .&lt;Employee, Employee&gt; chunk(10)\r\n            .reader(reader())\r\n            .processor(processor())\r\n            .writer(writer)\r\n            .build();\r\n    }\r\n    \/\/ end::jobstep[]\r\n}\r\n<\/pre>\n<p><code>@EnableBatchProcessing<\/code>\u00a0annotation is used for enabling batch processing.<br \/>\n<code>JobBuilderFactory<\/code> is the factory which is used for building a job.<br \/>\n<code>StepBuilderFactory<\/code> is used for step creation.<br \/>\nThe method <code>step1()<\/code> has a property <code>chunk()<\/code>. This is the property used for chunking the input into a defined size. For us, the size is 10.<\/p>\n<h3>4.6 Item Processor<\/h3>\n<p>Item processor is an interface which will be responsible for processing the data. We will implement the interface in <code>EmployeeItemProcessor.java<\/code>. The java class will look as shown below.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>EmployeeItemProcessor.java<\/em><\/span><\/p>\n<pre class=\"brush:java\">package com.batch.processor;\r\n\r\nimport org.slf4j.Logger;\r\nimport org.slf4j.LoggerFactory;\r\nimport org.springframework.batch.item.ItemProcessor;\r\n\r\nimport com.batch.Employee;\r\n\r\npublic class EmployeeItemProcessor implements ItemProcessor&lt;Employee, Employee&gt; {\r\n\r\n    private static final Logger log = LoggerFactory.getLogger(EmployeeItemProcessor.class);\r\n\r\n    @Override\r\n    public Employee process(Employee emp) throws Exception {\r\n        final String firstName = emp.getFirstName().toUpperCase();\r\n        final String lastName = emp.getLastName().toUpperCase();\r\n\r\n        final Employee transformedEmployee = new Employee(firstName, lastName);\r\n\r\n        log.info(\"Converting (\" + emp + \") into (\" + transformedEmployee + \")\");\r\n\r\n        return transformedEmployee;\r\n    }\r\n\r\n}\r\n\r\n<\/pre>\n<p>In the <code>process()<\/code> method we will be getting the data and we will be transforming it into the uppercase name.<\/p>\n<h3>4.7 JobExecutionSupportListener class<\/h3>\n<p><code>JobExecutionListenerSupport<\/code> is the interface that will notify when the job is completed. As part of the interface, we have <code>afterJob<\/code> method. This method is used to post the completion of the job.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>JobCompletionNotificationListener.java<\/em><\/span><\/p>\n<pre class=\"brush:java\">package com.batch.config;\r\nimport java.util.List;\r\n\r\nimport org.slf4j.Logger;\r\nimport org.slf4j.LoggerFactory;\r\nimport org.springframework.batch.core.BatchStatus;\r\nimport org.springframework.batch.core.JobExecution;\r\nimport org.springframework.batch.core.listener.JobExecutionListenerSupport;\r\nimport org.springframework.beans.factory.annotation.Autowired;\r\nimport org.springframework.jdbc.core.JdbcTemplate;\r\nimport org.springframework.jdbc.core.RowMapper;\r\nimport org.springframework.stereotype.Component;\r\n\r\nimport com.batch.Employee;\r\n\r\n@Component\r\npublic class JobCompletionNotificationListener extends JobExecutionListenerSupport {\r\n\r\n\tprivate static final Logger log = LoggerFactory.getLogger(JobCompletionNotificationListener.class);\r\n\r\n\tprivate final JdbcTemplate jdbcTemplate;\r\n\r\n\t@Autowired\r\n\tpublic JobCompletionNotificationListener(JdbcTemplate jdbcTemplate) {\r\n\t\tthis.jdbcTemplate = jdbcTemplate;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void afterJob(JobExecution jobExecution) {\r\n\t\tRowMapper rowMapper = (rs, rowNum) -&gt; {\r\n\r\n\t\t\tEmployee e = new Employee();\r\n\r\n\t\t\te.setFirstName(rs.getString(1));\r\n\t\t\te.setLastName(rs.getString(2));\r\n\t\t\treturn e;\r\n\t\t};\r\n\t\tif(jobExecution.getStatus() == BatchStatus.COMPLETED) {\r\n\t\t\tlog.info(\"!!! JOB FINISHED! Time to verify the results\");\r\n\r\n\t\tList empList= jdbcTemplate.query(\"SELECT first_name, last_name FROM employee\",rowMapper);\r\n\t\tlog.info(\"Size of List \"+empList.size());\r\n\t\tfor (Employee emp: empList) {\r\n\t\t\tlog.info(\"Found: \"+emp.getFirstName()+\" \"+emp.getLastName());\r\n\t\t\t\r\n\t\t}\r\n\t\t}\r\n\t}\r\n}\r\n<\/pre>\n<p>In this method, we are getting the data from the database post completion of the job and we are printing the result on the console to verify the processing that was performed on the data.<\/p>\n<h3>4.8 Application class<\/h3>\n<p>We will create an application class which will contain the main method responsible for triggering the java batch program. The class will look as shown below.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>Application.java<\/em><\/span><\/p>\n<pre class=\"brush:java\">package com.batch;\r\nimport org.springframework.boot.SpringApplication;\r\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\r\n\r\n@SpringBootApplication\r\npublic class Application {\r\n\r\n    public static void main(String[] args) throws Exception {\r\n        SpringApplication.run(Application.class, args);\r\n    }\r\n}\r\n<\/pre>\n<p><code>@SpringBootApplication<\/code> is the annotation used for specifying a program as a spring boot program.<\/p>\n<h2>5. Output<\/h2>\n<p>Let&#8217;s execute the application as a Java application. We will get the following output on the console.<\/p>\n<p><figure id=\"attachment_76960\" aria-describedby=\"caption-attachment-76960\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/JB_output_JCG.jpg\"><img decoding=\"async\" class=\"size-full wp-image-76960\" src=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/JB_output_JCG.jpg\" alt=\"\" width=\"810\" height=\"267\" srcset=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/JB_output_JCG.jpg 810w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/JB_output_JCG-300x99.jpg 300w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/JB_output_JCG-768x253.jpg 768w\" sizes=\"(max-width: 810px) 100vw, 810px\" \/><\/a><figcaption id=\"caption-attachment-76960\" class=\"wp-caption-text\">The output of JavaBatch program<\/figcaption><\/figure><\/p>\n<p>The workflow of the batch program is very clearly available in the output. The Job starts with <code>importUserJob<\/code>, then step-1 execution starts where it converts the read data into uppercase.<\/p>\n<p>Post-processing of step, we can see the uppercase result on the console.<\/p>\n<h2>6. Summary<\/h2>\n<p>In this tutorial, we learnt the following things:<\/p>\n<ol>\n<li>Java batch contains Jobs which can contain multiple steps.<\/li>\n<li>Every step is a combination of reading, process, write.<\/li>\n<li>We can chunk out the data into different size for processing.<\/li>\n<\/ol>\n<h2>7.\u00a0Download the Eclipse project<\/h2>\n<p>This was a tutorial for JavaBatch with SpringBoot.<\/p>\n<div class=\"download\">You can download the full source code of this example here: <strong><a href=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2018\/05\/JavaBatch.zip\">JavaBatch.zip<\/a><\/strong><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In today&#8217;s world internet has changed the way we live our lives and one of the major reasons for that is the usage of internet for most of the daily chores. This lead to huge amount of data available for processing. Some of the examples where huge data is involved are processing payslips, bank statements, &hellip;<\/p>\n","protected":false},"author":22230,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[1744],"class_list":["post-76668","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-java-batch"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Java Batch Tutorial - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"In today&#039;s world internet has changed the way we live our lives and one of the major reasons for that is the usage of internet for most of the daily\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.javacodegeeks.com\/2018\/05\/java-batch-tutorial.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java Batch Tutorial - 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