>>Prueba a borrar el archivo "preferences" de la carpeta .josm para que se cree uno nuevo. Si has modificado la configuración de josm
>>haz una copia de seguridad antes de borrar el preferences.

Gracias Carlos.
A ver, he eliminado /home/paco/.josm/preferences (tengo otro archivo /home/paco/.josm/preferences.xml) y el sigue dando el mismo error.
Copio el resultado del comando:

paco@Tramuntana:~$ ./josm.sh
--2012-05-01 10:15:08--  http://josm.openstreetmap.de/josm-latest.jar
Resolent josm.openstreetmap.de... 139.17.3.227
S'està connectant a josm.openstreetmap.de|139.17.3.227|:80... conectat.
HTTP: Petició enviada, esperant resposta... 200 OK
Longitud: 7166026 (6,8M) [application/x-jar]
S'està desant a: «josm-latest.jar»

100%[======================================>] 7.166.026    740K/s   en 9,5s

2012-05-01 10:15:18 (739 KB/s) - s'ha desat «josm-latest.jar» [7166026/7166026]

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2012-04-30 01:31:00
Last Changed Author: Don-vip
Revision: 5207
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2012-04-30 01:08:34 +0200 (Mon, 30 Apr 2012)
Last Changed Rev: 5207

Acción tagginggroup_Water de barra de herramientas registrada sobreescrita: org.openstreetmap.josm.gui.tagging.TaggingPresetMenu obtiene org.openstreetmap.josm.gui.tagging.TaggingPresetMenu java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at org.openstreetmap.josm.Main.<init>(Main.java:335)
at org.openstreetmap.josm.gui.MainApplication.<init>(MainApplication.java:66) at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:270) Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
    at java.util.concurrent.FutureTask.get(FutureTask.java:111)
    at org.openstreetmap.josm.Main.<init>(Main.java:332)
    ... 2 more
Caused by: java.lang.NullPointerException
at org.openstreetmap.josm.gui.tagging.TaggingPreset.splitEscaped(TaggingPreset.java:953) at org.openstreetmap.josm.gui.tagging.TaggingPreset.access$300(TaggingPreset.java:94) at org.openstreetmap.josm.gui.tagging.TaggingPreset$ComboMultiSelect.initListEntriesFromAttributes(TaggingPreset.java:641) at org.openstreetmap.josm.gui.tagging.TaggingPreset$ComboMultiSelect.initListEntries(TaggingPreset.java:609) at org.openstreetmap.josm.gui.tagging.TaggingPreset$ComboMultiSelect.getValues(TaggingPreset.java:571) at org.openstreetmap.josm.gui.tagging.ac.AutoCompletionManager.cachePresets(AutoCompletionManager.java:156) at org.openstreetmap.josm.gui.preferences.map.TaggingPresetPreference.initialize(TaggingPresetPreference.java:282)
    at org.openstreetmap.josm.Main$2.call(Main.java:293)
    at org.openstreetmap.josm.Main$2.call(Main.java:286)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:679)


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