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Using JRebel in Eclipse

JRebel can be used with the Maven SkyVault SDK and Eclipse to implement Test Driven Development (TDD).
You should complete the tutorial to create a simple AMP project before attempting this tutorial, as you will need a simple AMP project to work with. If you prefer, you can create a fresh project to work with using the guidelines given in the tutorial. This tutorial will assume you have a simple AMP project created in the directory simple-module-project.
You will see how to install JRebel in Eclipse and then configure the Maven SkyVault SDK to use it in your Test Driven Development. You will see configuration for IDE-based execution of your project. This tutorial assumes you will be using Eclipse as your IDE.
  1. Import your simple AMP project into Eclipse if you have not already done so, using the instructions in the tutorial Maven SkyVault SDK with Eclipse as your guide.
  2. You now need to make sure JRebel for Eclipse is installed. For instructions on how to do that review the Eclipse tutorial at the ZeroTurnaround site.

    Attention: JRebel is most conveniently installed via the Eclipse Market Place.

    At this point you have JRebel installed and a suitable license activated.

  3. In Eclipse you need to connect JRebel to your project. Open the JRebel Config Center by selecting Window > Open Perspective > Other > JRebel Config Center from the Eclipse main menu.
  4. In the Projects panel select the checkbox for simple-module-project.

    Attention: You will also have to enable the JRebel JAR for the Run Configuration associated with your project, if you are going to be running your project in Eclipse. You will see how to do this shortly.

    You have now made JRebel in Eclipse aware of your project.

  5. Switch back to your default perspective (most likely Java EE).
  6. Create a Run Configuration for your project. From the Eclipse main menu select Run > Run Configurations...
  7. Locate Maven Build in the left panel and click it. Click the Create New Launch Configuration icon, which is located at the top left of the dialog.

    The right-hand side of the dialog will be populated with a multi-tab panel.

  8. For the Name text field enter MAVEN RAD for the profile name.
  9. Click in the Browse Workspace... button and select your project (simple-module-project).
  10. In the Goals text field enter clean install.

    This will cause the Maven goals clean and install to be executed when you run the launch configuration.

  11. In the Profiles text field enter amp-to-war, rad.

    This will cause the amp-to-war and rad profiles to be executed when the launch profile is run. Note that the rad profile stands for Rapid Application Development, and is the key profile that will allow you to make best use of JRebel in your project.

  12. Click Apply.
  13. Required: Click the JRE tab. You now need to copy the following JVM options into the VM arguments box: 

                
    -Xms1024m -Xmx4096m -XX:PermSize=1024m
    Note: These options will ensure that your project will not crash with PermGen space exceptions.
  14. Click Apply.
  15. Required: Click the JRebel tab to the right of the panel. You will see two check boxes. Ensure that the Enable JRebel agent check box is selected.

    Important: Without this step, JRebel will not be activated for this configuration.
  16. Click Apply.
  17. Click Run to run the configuration.
  18. Once the application has fully started you can log into SkyVault Explorer at http://localhost:8080/SkyVault. This will provide validation that SkyVault is running.
  19. Now switch back to Eclipse. In the Package Explorer expand the simple-module-project and expand src/test/java to locate the file DemoComponentTest.java.
  20. Right-click DemoComponentTest.java and select Run As > JUnit Test.

    In the Eclipse Console tab you will see a number of JRebel monitoring messages as the context loads, but this is only required the first time your test runs.

  21. Switch to the JUnit tab to see the results of running the test.

    The test should show green, indicating it ran successfully.

  22. For convenience, drag the JUnit tab so that it is continually viewable - underneath the Package Explorer is a convenient location.
  23. Now you will introduce a deliberate error into the test code, and re-run the test. In the DemoComponentTest.java source code, locate the testGetCompanyHome() method.
  24. Locate the following line of code: 

                            
    assertEquals("Company Home", companyHomeName);
  25. Change the code to the following: 

                            
    assertEquals("Company Hotel", companyHomeName);

    This will cause the test to fail when it is re-run.

  26. Right-click DemoComponentTest.java and select Run As > JUnit Test.

    After a short interval the test will fail.

  27. Change the code back to remove the error. Save your changes.
  28. Re-run the test.

    The test will run very quickly (without any reloading of the application server).

You have seen that the Maven SkyVault SDK integrates painlessly with JRebel. This, combined with an IDE such as Eclipse, helps to to create a Test Driven Development environment, where code changes and tests can be carried out without the time-consuming necessity for application server restarts.
Parent topic: Using JRebel

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