Passing parameters in Job and Step level in Spring Batch

1. Job level

Besides passing parameters when building a job, using Job Listener to pass extra job level parameters which can be used through the job running. Specifically, create a class who implements JobExecutionListener, override below method: 

@Override
public void beforeJob(JobExecution jobExecution)

In the method, add more parameters into job context as below:

ExecutionContext jobExecutionContext = jobExecution.getExecutionContext();

jobExecutionContext.put(someKey, someValue);

In Job's steps, using below code to introduce the parameter:

@Value("#{jobExecutionContext[someKey]}")
private SomeCalss someClassInstance; // the value will be someValue

2. Step level

How to pass parameters between Steps within a job?

It is the same as Job level, the Step should implement a Listener StepExecutionListener.

Say if you want to passing a parameter from step1 to step2. Step 1 should implements the above Listener, in afterStep method, add the parameter into execution context:

@Override
public ExitStatus afterStep(StepExecution stepExecution) {
    // put a number into job execution context for future use
    stepExecution.getJobExecution().getExecutionContext().putLong("aNumber", aNumber);
    return null;
}

Step 2 also implements the Listener but in before step method to get the parameter out.

@Override
public void beforeStep(StepExecution stepExecution) {
    aNumber = stepExecution.getJobExecution().getExecutionContext().getLong("aNumber");

}

Via this way you can passing parameters from one step to another.