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Updated readme.

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Harald Kuhr 2013-11-15 13:44:56 +01:00
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@ -268,13 +268,15 @@ from Oracle.
Because the `ImageIO` plugin registry (the `IIORegistry`) is "VM global", it doesn't by default work well with Because the `ImageIO` plugin registry (the `IIORegistry`) is "VM global", it doesn't by default work well with
servlet contexts. This is especially evident if you load plugins from the `WEB-INF/lib` or `classes` folder. servlet contexts. This is especially evident if you load plugins from the `WEB-INF/lib` or `classes` folder.
Unless you add `ImageIO.scanForPlugins()` somewhere in your code, the plugins might never be available at all.
Servlet contexts dynamically loads and unloads classes (using a new class loader per context). I addition, servlet contexts dynamically loads and unloads classes (using a new class loader per context).
If you restart your application, old classes will by default remain in memory forever (because the next time If you restart your application, old classes will by default remain in memory forever (because the next time
`scanForPlugins` is called, it's another `ClassLoader` that scans/loads classes, and thus they will be new instances `scanForPlugins` is called, it's another `ClassLoader` that scans/loads classes, and thus they will be new instances
in the registry). in the registry).
To work around this resource leak, it is recommended to use the `IIOProviderContextListener` that implements To work around both the discovery problem and the resource leak,
it is recommended to use the `IIOProviderContextListener` that implements
dynamic loading and unloading of ImageIO plugins for web applications. dynamic loading and unloading of ImageIO plugins for web applications.
<web-app ...> <web-app ...>