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Updated readme.

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Harald Kuhr 2013-11-15 13:44:56 +01:00
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README.md
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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
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
`scanForPlugins` is called, it's another `ClassLoader` that scans/loads classes, and thus they will be new instances
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.
<web-app ...>