How do I set JobParameters in spring batch with spring-boot

Question

I followed the guide at http://spring.io/guides/gs/batch-processing/ but it describes a job with no configurable parameters. I'm using Maven to build my project.

I'm porting an existing job that I have defined in XML and would like to pass-in the jobParameters through the command.

I tried the following :

@Configuration @EnableBatchProcessing public class MyBatchConfiguration {      // other beans ommited      @Bean      public Resource destFile(@Value("#{jobParameters[dest]}") String dest) {         return new FileSystemResource(dest);     }  } 

Then I compile my project using :

mvn clean package 

Then I try to launch the program like this :

java my-jarfile.jar dest=/tmp/foo 

And I get an exception saying :

[...] Caused by: org.springframework.expression.spel.SpelEvaluationException:  EL1008E:(pos 0): Field or property 'jobParameters' cannot be found on object of  type 'org.springframework.beans.factory.config.BeanExpressionContext' 

Thanks !

Answer 1

Parse in job parameters from the command line and then create and populate JobParameters.

public JobParameters getJobParameters() {     JobParametersBuilder jobParametersBuilder = new JobParametersBuilder();     jobParametersBuilder.addString("dest", <dest_from_cmd_line);     jobParametersBuilder.addDate("date", <date_from_cmd_line>);     return jobParametersBuilder.toJobParameters(); } 

Pass them to your job via JobLauncher -

JobLauncher jobLauncher = context.getBean(JobLauncher.class); JobExecution jobExecution = jobLauncher.run(job, jobParameters); 

Now you can access them using code like -

@Bean  @StepScope public Resource destFile(@Value("#{jobParameters[dest]}") String dest) {     return new FileSystemResource(dest); } 

Or in a @Configuration class that is configuring Spring Batch Job artifacts like - ItemReader, ItemWriter, etc...

@Bean @StepScope public JdbcCursorItemReader<MyPojo> reader(@Value("#{jobParameters}") Map jobParameters) {     return new MyReaderHelper.getReader(jobParameters); }