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Start Glass Fish 4.0 by opening a command window and running the following command: Because the sample payroll application uses a database (to write out processed data), we need a database running before we can run our application.
You can start the Apache Derby database by running the following command: from a browser.
Accessing this URL should present the screen shown in Figure 2.
Figure 2 Click the Calculate Payroll button and you should see a new entry in the table, as shown in Figure 3.
A batch job must be initiated explicitly, say, from a servlet or from an Enterprise Java Beans (EJB) timer or an EJB business method.
In our payroll application, we use a servlet (named ) to submit a batch job.
Batch processing is used in many industries for tasks ranging from payroll processing; statement generation; end-of-day jobs such as interest calculation and ETL (extract, load, and transform) in a data warehouse; and many more.
Typically, batch processing is bulk-oriented, non-interactive, and long running—and might be data- or computation-intensive.
We discussed that a step is a domain object that encapsulates an independent, sequential phase of the job, and a job is basically a container for one or more steps.
JSR 352 (Batch Processing for Java Platform), part of the recently introduced Java EE 7 platform, defines the programming model for batch applications plus a runtime to run and manage batch jobs.
This article covers some of the key concepts including feature highlights, an overview of selected APIs, the structure of Job Specification Language, and a sample batch application.
Let's deploy the payroll application that we have developed into the Glass Fish 4.0 application server.
Glass Fish 4.0 is the reference implementation (RI) for the Java EE 7.0 specification and contains the RI for JSR 352 as well.A batch application can have as many JSLs as it wants, thus allowing it to start as many batch jobs as required.