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Editorial Team
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Asked: 2026-05-23T07:07:12+00:00

I’m trying to utilize the Image task in Ant, which requires Java Advanced Imaging.

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I’m trying to utilize the Image task in Ant, which requires Java Advanced Imaging. The .jar file seems to be in the Ant library, but when I try to scale an image, it gives me the following error:

Could not load a dependent class javax/media/jai/PlanarImage

Is there a reason why the ant-jai.jar file wouldn’t have this class already? Does anyone have experience with using either JAI in Ant, or specifically in using the Image task successfully?

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1 Answer

  1. Editorial Team

    The JAR contains only the objects defined in the Image task. You’ll have to put JAI on your class path, too.

    Addendum: Regarding NoClassDefFoundError: javax.media.jai.OperationRegistrySpi, you might verify that the class is in jai_core.jar, as shown below. One way to track down such anomalies is to use the -verbose option of the java command.

    $ jar tf jai_core.jar | grep OperationRegistrySpi
javax/media/jai/OperationRegistrySpi.class

$ jar tf lib/ant-jai.jar 
META-INF/
META-INF/MANIFEST.MF
org/
org/apache/
org/apache/tools/
org/apache/tools/ant/
org/apache/tools/ant/taskdefs/
org/apache/tools/ant/taskdefs/optional/
org/apache/tools/ant/taskdefs/optional/image/
org/apache/tools/ant/taskdefs/optional/image/Image.class
org/apache/tools/ant/types/
org/apache/tools/ant/types/optional/
org/apache/tools/ant/types/optional/image/
org/apache/tools/ant/types/optional/image/Arc.class
org/apache/tools/ant/types/optional/image/BasicShape.class
org/apache/tools/ant/types/optional/image/ColorMapper.class
org/apache/tools/ant/types/optional/image/Draw.class
org/apache/tools/ant/types/optional/image/DrawOperation.class
org/apache/tools/ant/types/optional/image/Ellipse.class
org/apache/tools/ant/types/optional/image/ImageOperation.class
org/apache/tools/ant/types/optional/image/Rectangle.class
org/apache/tools/ant/types/optional/image/Rotate.class
org/apache/tools/ant/types/optional/image/Scale$ProportionsAttribute.class
org/apache/tools/ant/types/optional/image/Scale.class
org/apache/tools/ant/types/optional/image/Text.class
org/apache/tools/ant/types/optional/image/TransformOperation.class
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