OutOfMemoryError in JPEGImageReader

>>> stack of 2.cause::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:980) at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:948) at javax.imageio.ImageIO.read(ImageIO.java:1422) at javax.imageio.ImageIO.read(ImageIO.java:1326) at org.olat.core.util.ImageHelper.scaleImage(ImageHelper.java:144) at org.olat.core.commons.services.thumbnail.impl.ImageToThumbnail.generateThumbnail(ImageToThumbnail.java:62)