This chapter is a tutorial that describes how to create and run an application that uses Oracle Enterprise Scheduler to run job requests and demonstrates how to work with Oracle JDeveloper to create an application using Oracle Enterprise Scheduler.
The chapter then shows a variation on the sample application using two split applications — a job submission application, a submitter, and a job execution application, a hosting application.
Some aspects of developing Oracle Enterprise Scheduler applications with Oracle JDeveloper require that you set the Middleware Home environment variable to the installation location of Oracle JDeveloper itself. Before you begin using Oracle JDeveloper to develop Oracle Enterprise Scheduler applications, be sure to set this variable.
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JDeveloper provides accessibility options, such as support for screen readers, screen magnifiers, and standard shortcut keys for keyboard navigation. You can also customize JDeveloper for better readability, including the size and color of fonts and the color and shape of objects. For information and instructions on configuring accessibility in JDeveloper, see Oracle JDeveloper Accessibility Information in Developing Applications with Oracle JDeveloper.
As you create projects in Oracle JDeveloper for developing Oracle Enterprise Scheduler applications, you add underlying support for application functionality by specifying support for particular project technologies.
For more information on creating Oracle Enterprise Scheduler applications, see Building a Combined Oracle Enterprise Scheduler Application and Building Split Submitting and Hosting Applications.
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The EssDemoApp sample application you build in this tutorial includes a complete application that you build with Oracle JDeveloper using Oracle Enterprise Scheduler APIs.
In this example, you'll create a hosting application and a simple Java job implementation. Though the example here is simple, its job class implements the
The instructions in this chapter assume that you are using a new Oracle JDeveloper that you installed without previously saved projects or other saved Oracle JDeveloper state. If you have previously used Oracle JDeveloper, some of the instructions may not match the exact steps shown in this chapter, or you may be able to shorten procedures or perform the same action in fewer steps. In some cases Oracle JDeveloper does not show certain dialogs based on your past use of Oracle JDeveloper.
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When you use Oracle Enterprise Scheduler the application metadata is stored with MDS. To use MDS you need to have access to a database with MDS user and schema configured.
You also need a WebLogic Server instance to which Oracle Enterprise Scheduler is deployed in standalone mode. You should have access to a database with the Oracle Enterprise Scheduler schema installed.
Using Oracle JDeveloper you create an application and projects within the application that contains the code and supporting files for the application. To create the sample application you need to do the following:
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To work with Oracle Enterprise Scheduler, you first create an application in Oracle JDeveloper. You'll also create a hosting application to support job execution.
In the preceding step, you created a project in which to develop the application to host your jobs. In this section, you'll use Oracle JDeveloper to create another project in the EssDemoApp application. This second project provides support for client interaction with the hosting application.
For a Java job, which is what you'll be adding here, an implementation class implements the logic of your job -- the code that does job's actual work. The class implements the
Using Oracle Jdeveloper To Generate An Oracle Enterprise Scheduler Application
Method provides a place where you can add the job's logic. Though the code in this example is very simple, the execute method can also serve as a starting place for processing that continues into code to which the Java job has access.
As with other job types, including PL/SQL and process jobs, a Java job's work is guided by metadata. This metadata forms a job-specific context that can include Oracle Enterprise Scheduler-defined system properties, properties you create, and control of who has access to the metadata. For example, metadata might be a way for you to collect and pass instance data to downstream code.
In an Oracle Enterprise Scheduler application you use the Oracle Enterprise Scheduler APIs to submit job requests from any component in the application. The EssDemoApp sample application provides a Java servlet for a servlet-based user interface for submitting job requests (using Oracle Enterprise Scheduler).
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With Oracle Enterprise Scheduler properties, you set values for settings used in the ejb-jar.xml file associated with the application. These properties include the following:
The sample application must contain the required EJB descriptors. You need to create the ejb-jar.xml and weblogic-ejb-jar.xml files and include these files with any Java implementation class that you create.
Oracle Enterprise Scheduler requires an application to assemble and provide an EJB JAR so that Oracle Enterprise Scheduler can find its entry point in the application while running job requests on behalf of the application. This EJB jar should have its required EJB descriptors in ejb-jar.xml and weblogic-ejb-jar, as well as any Java class implementations that are going to be submitted to Oracle Enterprise Scheduler. The descriptor files ejb-jar.xml and weblogic-ejb-jar must contain descriptions for the Oracle Enterprise Scheduler EJBs and should not be modified.
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Navigate to EssClient > Web Content > WEB-INF > web.xml as shown in Figure 7-12. Change the value in the Security window Realm field from:
After you complete the steps to build and assemble the EssDemoApp application you need to deploy the application to Oracle WebLogic Server. After you successfully deploy an application you can run the application. For the EssDemoApp sample application you use a browser to run the EssDemo servlet to submit job requests to Oracle Enterprise Scheduler running on Oracle WebLogic Server.
To deploy the EssDemoApp application you need a properly configured and running Oracle WebLogic Server, and you need an active metadata server. When you deploy the application Oracle JDeveloper brings up the Deployment Configuration page. Select your repository from the dropdown list and Enter a partition name (the partition name defaults to application name).
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When you build and deploy Oracle Enterprise Scheduler applications, you can use two split applications -- a job submission application, a submitter, and a job execution application, a hosting application. Using this design, you need to configure and deploy each application with options that support such a split configuration.
In addition, some Oracle Enterprise Scheduler deployments use a separate Oracle WebLogic Server for the hosting and the submitting applications; for this deployment option the submitting application and the hosting application are deployed to separate Oracle WebLogic Servers. When the submitter application and the hosting application for Oracle Enterprise Scheduler run on separate Oracle WebLogic Servers, you need to configure the Oracle WebLogic Server for the hosting application so that the submitting application can find the hosting application.
This section creates a new application. If you have created EssDemoApp with the sections beginning with Creating the Application and Projects for EssDemoApp Application, note that this section creates a project of the same name. You'll need to choose a different location for the application or delete the previous application in order to use the EssDemoApp application name in this section.
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To work with Oracle Enterprise Scheduler with a split application you use Oracle JDeveloper to create the back-end application and project, and to add Oracle Enterprise Scheduler extensions to the project.
To use the Oracle Enterprise Scheduler split application to submit a job request you need to create metadata that defines a job request, including the following:
To define an application that runs a Java class under control of Oracle Enterprise Scheduler you need to create the Java class that implements the Oracle Enterprise Scheduler
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In this section, you'll prepare an EAR file that assembles the EssDemoApp sample application. The EAR archive consists of the EJB JAR including the Oracle Enterprise Scheduler Java job implementation.
In an Oracle Enterprise Scheduler split application you use the Oracle Enterprise Scheduler APIs to submit job requests from a front-end application. The
You need to configure security for the application. You do not have to create any users or roles as the EssDemoAppUI application simply shares the users and roles created by the EssDemoApp application.
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Normally, more complex user interfaces that are built on heavy weight frameworks such as Oracle Application Development Framework are employed, but for the sake of simplicity, you use a basic HTTP servlet for the submitter application.
You need to edit the adf-config.xml file to tell the application to share the metadata that was created in the hosting application.
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