JobParametersValidator.validate() method parameters returns null in spring batch - spring

Question

I am writing simple helloworld application in spring batch, and I'm trying to validate the JobParameters with custom implementation of JobParametersValidator.
public class ParameterValidator implements JobParametersValidator{
#Override
public void validate(JobParameters parameters) throws JobParametersInvalidException {
//String parameter = parameters.getParameters().get("outputText");
System.out.println("jobparameters are ............ " + parameters);
//System.out.println("parameter is " + parameter);
//if(!StringUtils.hasText(parameter)) {
throw new JobParametersInvalidException("Parameter is missing.........");
//}
}
}
But when I tried to Sysout the JobParameters inside the validate method, parameters return null.
Here is my console out.
2021-11-26 10:06:32.457 INFO 11912 --- [ restartedMain] com.pack.SpringBatchDemo2Application : Starting SpringBatchDemo2Application using Java 16.0.2 on DESKTOP-T1L7IA7 with PID 11912 (D:\Workspace\EclipseWorkspaceSpringPractise\SpringBatchDemo2\target\classes started by arepa in D:\Workspace\EclipseWorkspaceSpringPractise\SpringBatchDemo2)
2021-11-26 10:06:32.458 INFO 11912 --- [ restartedMain] com.pack.SpringBatchDemo2Application : No active profile set, falling back to default profiles: default
2021-11-26 10:06:32.536 INFO 11912 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2021-11-26 10:06:33.575 INFO 11912 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2021-11-26 10:06:33.784 INFO 11912 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2021-11-26 10:06:33.920 INFO 11912 --- [ restartedMain] o.s.b.c.r.s.JobRepositoryFactoryBean : No database type set, using meta data indicating: POSTGRES
2021-11-26 10:06:34.262 INFO 11912 --- [ restartedMain] o.s.b.c.l.support.SimpleJobLauncher : No TaskExecutor has been set, defaulting to synchronous executor.
2021-11-26 10:06:34.484 INFO 11912 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2021-11-26 10:06:34.539 INFO 11912 --- [ restartedMain] com.pack.SpringBatchDemo2Application : Started SpringBatchDemo2Application in 2.596 seconds (JVM running for 4.056)
2021-11-26 10:06:34.544 INFO 11912 --- [ restartedMain] o.s.b.a.b.JobLauncherApplicationRunner : Running default command line with: []
jobparameters are ............ {}
2021-11-26 10:06:34.713 INFO 11912 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-11-26 10:06:34.756 ERROR 11912 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
Here is my Job creation code.
#Component
public class HelloWorldJob {
#Autowired
private JobBuilderFactory jobBuilderFactory;
#Autowired
private StepBuilderFactory stepBuilderFactory;
public Step step() {
Tasklet tasklet = (contribution, chunkContext) -> {
return RepeatStatus.FINISHED;
};
return this.stepBuilderFactory.get("step1")
.tasklet(tasklet).build();
}
#Bean
public Job job() {
return this.jobBuilderFactory.get("job1").start(step()).validator(new ParameterValidator()).build();
}
}
Here is my code for triggering jobs.
#Component
public class TriggerJobLauncher {
#Autowired
private JobLauncher launcher;
#Autowired
private Job job;
public void triggerJob() throws JobExecutionAlreadyRunningException,
JobRestartException,
JobInstanceAlreadyCompleteException,
JobParametersInvalidException {
JobParameters parameters = new JobParametersBuilder().addParameter("aa", new JobParameter("Hello World")).toJobParameters();
launcher.run(job, parameters);
}
}