Program Error after downloading data

[CSchultz]

I starte JOSM, load attached file into JOSM and download new Area to the file. after downloading the Errormessage comes up.
Daten for the OSM downldbox:
min lat: 53.181029818244, max lat: 53.231234341254, min long: 10.36477064327,
max long: 10.456671503504

Coredump:

Path: trunk
URL: ​http://josm.openstreetmap.de/svn/trunk
Repository Root: ​http://josm.openstreetmap.de/svn
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Revision: 2255
Node Kind: directory
Last Changed Author: Gubaer
Last Changed Rev: 2255
Last Changed Date: 2009-10-07 21:25:15 +0200 (Wed, 07 Oct 2009)

Memory Usage: 63 MB / 63 MB (4 MB allocated, but free)
Java version: 1.6.0_15

Plugins: remotecontrol
routing
tageditor
validator
wmsplugin
Plugin remotecontrol Version: 17858
Plugin routing Version: 17544
Plugin tageditor Version: 17638
Plugin validator Version: 17722
Plugin wmsplugin Version: 17817

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

at org.openstreetmap.josm.gui.PleaseWaitRunnable$2.run(PleaseWaitRunnable.java:98)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Caused by: java.lang.reflect.InvocationTargetException

at java.awt.EventQueue.invokeAndWait(Unknown Source)
at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRealRun(PleaseWaitRunnable.java:67)
at org.openstreetmap.josm.gui.PleaseWaitRunnable.run(PleaseWaitRunnable.java:116)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.OutOfMemoryError: Java heap space

at org.openstreetmap.josm.data.osm.OsmPrimitive.hashCode(OsmPrimitive.java:482)
at java.util.HashMap.put(Unknown Source)
at java.util.HashSet.add(Unknown Source)
at org.openstreetmap.josm.data.osm.BackreferencedDataSet.remember(BackreferencedDataSet.java:124)
at org.openstreetmap.josm.data.osm.BackreferencedDataSet.build(BackreferencedDataSet.java:135)
at org.openstreetmap.josm.gui.layer.OsmDataLayer.buildPurgeCommand(OsmDataLayer.java:403)
at org.openstreetmap.josm.gui.layer.OsmDataLayer.mergeFrom(OsmDataLayer.java:309)
at org.openstreetmap.josm.actions.downloadtasks.DownloadOsmTask$Task.finish(DownloadOsmTask.java:135)
at org.openstreetmap.josm.gui.PleaseWaitRunnable$1.run(PleaseWaitRunnable.java:69)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.Dialog$1.run(Unknown Source)
at java.awt.Dialog$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Unknown Source)
at java.awt.Component.show(Unknown Source)
at java.awt.Component.setVisible(Unknown Source)
at java.awt.Window.setVisible(Unknown Source)
at java.awt.Dialog.setVisible(Unknown Source)
at org.openstreetmap.josm.gui.progress.PleaseWaitProgressMonitor$4.run(PleaseWaitProgressMonitor.java:102)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)