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Thursday, July 19, 2012

Glassfish: Dynamic Reloading Feature

Dynamic Reloading

If dynamic reloading is enabled, you do not have to redeploy an application or module when you change its code or deployment descriptors. All you have to do is copy the changed pages or class files into the deployment directory for the application or module. The deployment directory for a web module named context-root is domain-dir/applications/context-root.

The server checks for changes periodically and redeploys the application, automatically and dynamically, with the changes.

This capability is useful in a development environment because it allows code changes to be tested quickly.

Dynamic reloading IS NOT RECOMMENDED for a production environment, however, because it may degrade performance. In addition, whenever a reload is done, the sessions at that time become invalid, and the client must restart the session.

Note: In the GlassFish Server, dynamic reloading is enabled by default.

To Disable or ModifyDynamic Reloading

If for some reason you do not want the default dynamic reloading behavior, follow these steps in the Administration Console.
  1. Open the URL http://localhost:4848/ in a browser.

  2. Select the GlassFish Server node.

  3. Select the Advanced tab.

  4. To disable dynamic reloading, deselect the Reload Enabled check box.

  5. To change the interval at which applications and modules are checked for code changes and dynamically reloaded, type a number of seconds in the Reload Poll Interval field.

    The default value is 2 seconds.

  6. Click the Save button.