document conversion causing OOME

2015-06-18 01:37:48,036 ERROR [conversion-thread-3] [plugins.conversion.impl.TimeoutConversionRunnable] run Cannot convert. Execution error: 
 -- referer: https://extranet.atlassian.com/pages/editpage.action?pageId=2392722882 | url: /rest/documentConversion/latest/conversion/thumbnail/results | userName: mfinch
java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: Java heap space
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:206)
	at com.atlassian.confluence.plugins.conversion.impl.TimeoutConversionRunnable.run(TimeoutConversionRunnable.java:75)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.OutOfMemoryError: Java heap space
	at java.awt.image.DataBufferInt.<init>(DataBufferInt.java:75)
	at java.awt.image.Raster.createPackedRaster(Raster.java:467)
	at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1032)
	at java.awt.image.BufferedImage.<init>(BufferedImage.java:340)
	at com.aspose.pdf.internal.p429.z2.m6(Unknown Source)
	at com.aspose.pdf.internal.p429.z2.m1(Unknown Source)
	at com.aspose.pdf.internal.p310.z2.m1(Unknown Source)
	at com.aspose.pdf.internal.p310.z2.<init>(Unknown Source)
	at com.aspose.pdf.internal.p310.z2.<init>(Unknown Source)
	at com.aspose.pdf.internal.p310.z23.m2(Unknown Source)
	at com.aspose.pdf.internal.p310.z23.m1(Unknown Source)
	at com.aspose.pdf.internal.p310.z23.m1(Unknown Source)
	at com.aspose.pdf.internal.p310.z23.m1(Unknown Source)
	at com.aspose.pdf.internal.p582.z8.m1(Unknown Source)
	at com.aspose.pdf.internal.p525.z1.m1(Unknown Source)
	at com.aspose.pdf.internal.p512.z20.m2(Unknown Source)
	at com.aspose.pdf.internal.p512.z20.m4(Unknown Source)
	at com.aspose.pdf.internal.p512.z7.m2(Unknown Source)
	at com.aspose.pdf.internal.p512.z7.m1(Unknown Source)
	at com.aspose.pdf.devices.z1.m1(Unknown Source)
	at com.aspose.pdf.devices.z1.m1(Unknown Source)
	at com.aspose.pdf.devices.ImageDevice.m1(Unknown Source)
	at com.aspose.pdf.devices.JpegDevice.processInternal(Unknown Source)
	at com.aspose.pdf.devices.JpegDevice.process(Unknown Source)
	at com.atlassian.plugins.conversion.convert.image.ImagingConverter.thumbnailForPdf(Unknown Source)
	at com.atlassian.plugins.conversion.convert.image.ImagingConverter.generateThumbnailDirect(Unknown Source)
	at com.atlassian.confluence.plugins.conversion.impl.runnable.JVMConversionRunnable.doWork(JVMConversionRunnable.java:67)
	at com.atlassian.confluence.plugins.conversion.impl.runnable.ConversionRunnable.run(ConversionRunnable.java:39)
	at com.atlassian.confluence.plugins.conversion.impl.runnable.JVMConversionRunnable.run(JVMConversionRunnable.java:18)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)