This on Josm menu → Scripting → Configure

[mcheck]

Build-Date: 2013-05-03 01:35:08
Last Changed Author: Don-vip
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Date: 2013-05-01 03:38:53 +0200 (Wed, 01 May 2013)
Repository Root: http://josm.openstreetmap.de/svn
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Rev: 5921
Revision: 5921

Identification: JOSM/1.5 (5921 it) Linux Ubuntu 12.04.2 LTS
Memory Usage: 196 MB / 878 MB (107 MB allocated, but free)
Java version: 1.8.0-ea, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM

Plugin: AddrInterpolation (29435)
Plugin: FastDraw (29532)
Plugin: FixAddresses (29519)
Plugin: HouseNumberTaggingTool (29487)
Plugin: ImportImagePlugin (29531)
Plugin: OpeningHoursEditor (29435)
Plugin: PicLayer (29531)
Plugin: RoadSigns (29435)
Plugin: SimplifyArea (29435)
Plugin: buildings_tools (29435)
Plugin: continuosDownload (28565)
Plugin: contourmerge (1003)
Plugin: dataimport (29435)
Plugin: download_along (29435)
Plugin: ext_tools (29435)
Plugin: geotools (29435)
Plugin: graphview (29525)
Plugin: imageryadjust (29435)
Plugin: importvec (29435)
Plugin: irsrectify (29210)
Plugin: jts (29435)
Plugin: lakewalker (29435)
Plugin: log4j (29435)
Plugin: mirrored_download (29505)
Plugin: multipoly-convert (29435)
Plugin: namemanager (29435)
Plugin: opendata (29505)
Plugin: openstreetbugs (29435)
Plugin: pbf (29435)
Plugin: pdfimport (29435)
Plugin: photo_geotagging (29435)
Plugin: plastic_laf (29435)
Plugin: print (29529)
Plugin: proj4j (29435)
Plugin: reltoolbox (29535)
Plugin: reverter (29553)
Plugin: scripting (30300)
Plugin: tag2link (29461)
Plugin: tageditor (29435)
Plugin: tagging-preset-tester (29435)
Plugin: terracer (29509)
Plugin: turnlanes (29435)
Plugin: turnrestrictions (29435)
Plugin: utilsplugin2 (29435)
Plugin: walkingpapers (29480)
Plugin: waypoint_search (29435)
Plugin: wikipedia (29523)
Plugin: wms-turbo-challenge2 (29435)

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane$1.identify(PreferenceTabbedPane.java:203)
	at org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane.selectTabBy(PreferenceTabbedPane.java:191)
	at org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane.selectTabByName(PreferenceTabbedPane.java:200)
	at org.openstreetmap.josm.gui.preferences.PreferenceDialog.selectPreferencesTabByName(PreferenceDialog.java:130)
	at org.openstreetmap.josm.plugins.scripting.preferences.ConfigureAction.actionPerformed(ConfigureAction.java:27)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.menuDragMouseReleased(BasicMenuItemUI.java:943)
	at javax.swing.JMenuItem.fireMenuDragMouseReleased(JMenuItem.java:586)
	at javax.swing.JMenuItem.processMenuDragMouseEvent(JMenuItem.java:483)
	at javax.swing.JMenuItem.processMouseEvent(JMenuItem.java:429)
	at javax.swing.MenuSelectionManager.processMouseEvent(MenuSelectionManager.java:322)
	at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.eventDispatched(BasicPopupMenuUI.java:870)
	at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2435)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2327)
	at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2285)
	at java.awt.Component.dispatchEventImpl(Component.java:4765)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4691)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4856)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4516)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4446)
	at java.awt.Container.dispatchEventImpl(Container.java:2273)
	at java.awt.Window.dispatchEventImpl(Window.java:2721)
	at java.awt.Component.dispatchEvent(Component.java:4691)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:728)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:687)
	at java.awt.EventQueue$3.run(EventQueue.java:685)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.awt.EventQueue$4.run(EventQueue.java:701)
	at java.awt.EventQueue$4.run(EventQueue.java:699)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:698)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:220)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:135)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:123)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:119)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:111)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)

[rickmastfan67]

Just tried to duplicate this and can't. Might be a Java8 bug.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-05-02 01:35:17
Last Changed Author: Don-vip
Revision: 5921
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-05-01 03:38:53 +0200 (Wed, 01 May 2013)
Last Changed Rev: 5921

Identification: JOSM/1.5 (5921 en) Windows 7 64-Bit
Memory Usage: 213 MB / 2730 MB (73 MB allocated, but free)
Java version: 1.7.0_21, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Xmx3072M]
Dataset consistency test: No problems found

Plugin: ImageryCache (29484)
Plugin: OpeningHoursEditor (29435)
Plugin: buildings_tools (29435)
Plugin: mapdust (29525)
Plugin: measurement (29545)
Plugin: mirrored_download (29505)
Plugin: openstreetbugs (29435)
Plugin: osmarender (29435)
Plugin: reverter (29553)
Plugin: scripting (30300)
Plugin: turnrestrictions (29435)
Plugin: undelete (29555)
Plugin: utilsplugin2 (29435)

[Manu1400]

@mcheck : Can you uninstall and install again this plugin ?

[Don-vip]

In 5933/josm:

fix #8667 - NPE with plugins returning invalid preferences (scripting)