josm hangs on start (current svn)

[Cobra]

This happens every time I try to start josm built from svn r3843...

The Java/josm process needs to be killed afterwards, it won't terminate.

java.lang.IncompatibleClassChangeError: Expecting non-static method org.openstreetmap.josm.actions.DownloadReferrersAction.getCurrentDataSet()Lorg/openstreetmap/josm/data/osm/DataSet;
	at org.openstreetmap.josm.actions.DownloadReferrersAction.updateEnabledState(DownloadReferrersAction.java:93)
	at org.openstreetmap.josm.actions.JosmAction.initEnabledState(JosmAction.java:160)
	at org.openstreetmap.josm.actions.JosmAction.installAdapters(JosmAction.java:149)
	at org.openstreetmap.josm.actions.JosmAction.<init>(JosmAction.java:93)
	at org.openstreetmap.josm.actions.JosmAction.<init>(JosmAction.java:68)
	at org.openstreetmap.josm.actions.DownloadReferrersAction.<init>(DownloadReferrersAction.java:29)
	at org.openstreetmap.josm.gui.MainMenu.<init>(MainMenu.java:113)
	at org.openstreetmap.josm.Main.<init>(Main.java:215)
	at org.openstreetmap.josm.gui.MainApplication.<init>(MainApplication.java:58)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:225)

[stoecker]

Do a clean and rebuild.

[stoecker]

Closed as duplicate of #5888.