Getting java.lang.IllegalArgumentException: err.io.short_read exception when reading image data

Report · Aug 02, 2012

We use Flash to generate dynamic graphics and convert them to a PNG graphic by posting the base64 encoded bitmpa data to a coldfusion page, which saves the graphics file on the server.

This works well most of the time but for certain larger graphics we a ColdFusion exception in the post page, as follows:

08/02 12:40:16 error ROOT CAUSE:

java.lang.IllegalArgumentException: err.io.short_read

at coldfusion.filter.FormScope.parsePostData(FormScope.java:325)

at coldfusion.filter.FormScope.fillForm(FormScope.java:295)

at coldfusion.filter.FusionContext.SymTab_initForRequest(FusionContext.java:377)

etc....

I have not been able to find out whether this is a problem with the Flash code that does the posting or with some other configuration issue. The maxumum post size is 200MB and the images data is less than 200K

The Flash code for posting:

var img_source:BitmapData = new BitmapData (this.width, this.height+5);

img_source.draw(this);

//encode the bitmapdata object and keep the encoded ByteArray

var img_byte_array:ByteArray = PNGEncoder.encode(img_source);

var imgURLRequest:URLRequest = new URLRequest(image_url);

var requestVars:URLVariables = new URLVariables();

requestVars.upload_image_name = image_name;

// Convert to Base 64

requestVars.upload_image_data = Base64.encodeByteArray(img_byte_array);

imgURLRequest.data = requestVars;

imgURLRequest.method = URLRequestMethod.POST;

navigateToURL(imgURLRequest, "_self");

The ColdFusion page:

<html>

<head>

</head>

<body>

<cfoutput>Actual Size of image: #Len(upload_image_data)#</cfoutput><p>

<cffile action="write"

file= "#Application.properties.flash_test_result_tmp_directory##upload_image_name#"

output="#ToBinary(upload_image_data)#"/>

<button type="button" onClick="this.close();">Close this window</button>

</body>

</html>

Report · Aug 09, 2012

It looks like the host name was the issue. We used http://localhost:8302 and changing that to use the local IP address instead, such as http://<IP address>:8302 solved the problem. Not sure exactly why. The Flash movie contained an image that was loaded into the Flash movie from the server as well. But presumably when the bytes were collected from the finished movie's bitmap, the origins of the images are irrelevant?

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Getting java.lang.IllegalArgumentException: err.io.short_read exception when reading image data

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