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JavaWeb ImageIO报错

ImageIO在Web环境报: java.lang.NoClassDefFoundError: com/github/jaiimageio/stream/RawImageInputStream
这是因为ImageIO注册在JVM global, 而不支持Web Context. 需要在上下文中注册
注册完成后, 需要重启(ImageIO运行环境被污染了)

见[haraldk/TwelveMonkeys](https://github.com/haraldk/TwelveMonkeys#deploying-the-plugins-in-a-web-app)

<dependencies>
    ...
    <dependency>
        <groupId>com.twelvemonkeys.imageio</groupId>
        <artifactId>imageio-jpeg</artifactId>
        <version>3.4.2</version>
    </dependency>
    <dependency>
        <groupId>com.twelvemonkeys.imageio</groupId>
        <artifactId>imageio-tiff</artifactId>
        <version>3.4.2</version>
    </dependency>

    <!--
    Optional dependency. Needed only if you deploy `ImageIO` plugins as part of a web app.
    Make sure you add the `IIOProviderContextListener` to your `web.xml`, see above.
    -->
    <dependency>
        <groupId>com.twelvemonkeys.servlet</groupId>
        <artifactId>servlet</artifactId>
        <version>3.4.2</version>
    </dependency>
</dependencies>

在web.xml中配置

 <web-app ...>

...

    <listener>
        <display-name>ImageIO service provider loader/unloader</display-name>
        <listener-class>com.twelvemonkeys.servlet.image.IIOProviderContextListener</listener-class>
    </listener>

...

</web-app>

Reference

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