Getting OOM when Confluence renders thumbnail

2011-01-05 12:14:14,803 ERROR [http-8080-8] [[Standalone].[localhost].[/].[file-server]] log Servlet.service() for servlet file-server threw exception
java.lang.OutOfMemoryError: Java heap space
	at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:58)
	at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:397)
	at java.awt.image.Raster.createWritableRaster(Raster.java:938)
	at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1056)
	at javax.imageio.ImageReader.getDestination(ImageReader.java:2879)
	at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:913)
	at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:885)
	at javax.imageio.ImageIO.read(ImageIO.java:1422)
	at javax.imageio.ImageIO.read(ImageIO.java:1326)
	at com.atlassian.core.util.thumbnail.Thumber.getImage(Thumber.java:281)
	at com.atlassian.core.util.thumbnail.Thumber.createThumbnail(Thumber.java:241)
	at com.atlassian.core.util.thumbnail.Thumber.retrieveOrCreateThumbNail(Thumber.java:215)
	at com.atlassian.confluence.pages.thumbnail.DefaultThumbnailManager.getThumbnail(DefaultThumbnailManager.java:108)
	at com.atlassian.confluence.importexport.resource.ThumbnailDownloadResourceManager.getResourceReader(ThumbnailDownloadResourceManager.java:44)
	at com.atlassian.confluence.importexport.resource.DelegatorDownloadResourceManager.getResourceReaderFromDelegate(DelegatorDownloadResourceManager.java:75)
	at com.atlassian.confluence.importexport.resource.DelegatorDownloadResourceManager.getResourceReader(DelegatorDownloadResourceManager.java:32)
	at com.atlassian.confluence.servlet.download.AttachmentDownload.getStreamForDownload(AttachmentDownload.java:65)
	at com.atlassian.confluence.servlet.download.ServeAfterTransactionDownload$StreamResultCallback.doInTransaction(ServeAfterTransactionDownload.java:140)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:127)
	at com.atlassian.confluence.servlet.download.ServeAfterTransactionDownload.getStreamInTransaction(ServeAfterTransactionDownload.java:41)
	at com.atlassian.confluence.servlet.download.ServeAfterTransactionDownload.serveFile(ServeAfterTransactionDownload.java:50)
	at com.atlassian.plugin.servlet.AbstractFileServerServlet.doGet(AbstractFileServerServlet.java:33)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:77)
	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:63)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)