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Asked: 2026-06-03T01:57:54+00:00

I am trying to use the Scalr java image resizing library from clojure: [org.imgscalr/imgscalr-lib

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I am trying to use the Scalr java image resizing library from clojure:

[org.imgscalr/imgscalr-lib "4.2"]

When I import it and try to use it it fails, because of the variable number of args each method takes:

(import 'org.imgscalr.Scalr)
(def image (*acquire BufferedImage instance*))
(Scalr/resize image 200)

This gives me this error: 

No matching method: resize

This is because (as I have figured out) resize takes as its last argument a variable number of BufferedImageOps. So, I try to pass in a java array for these:

(import 'java.awt.image.BufferedImageOp)
(Scalr/resize image 200 (into-array BufferedImageOp []))

But this fails with 

No message.
[Thrown class java.lang.ClassCastException]

What am I doing wrong here? Thanks!

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1 Answer

  1. Editorial Team

    Possibly you are not acquiring the image as expected.
    e.g. This works for me….

    *clojure-version*
{:major 1, :minor 3, :incremental 0, :qualifier nil}
user> (import 'java.awt.image.BufferedImageOp)
java.awt.image.BufferedImageOp
user> (import 'java.awt.image.BufferedImage)
java.awt.image.BufferedImage
user> (Scalr/resize (BufferedImage. 10 10 BufferedImage/TYPE_INT_ARGB) 200 (into-array BufferedImageOp []))
#<BufferedImage BufferedImage@ccfe446: type = 2 DirectColorModel: rmask=ff0000 gmask=ff00 bmask=ff amask=ff000000 IntegerInterleavedRaster: width = 200 height = 200 #Bands = 4 xOff = 0 yOff = 0 dataOffset[0] 0>
user>
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