Got this in Windows 7 as well. Also upgrading this to blocker since it blocks any attempt to upload data if you've added a tag to any way (doesn't show up if all you've done is move some nodes without adding/removing any from a way).
Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2014-01-30 02:37:19
Last Changed Author: Don-vip
Revision: 6783
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2014-01-30 02:08:22 +0100 (Thu, 30 Jan 2014)
Last Changed Rev: 6783
Identification: JOSM/1.5 (6783 en) Windows 7 64-Bit
Memory Usage: 222 MB / 1820 MB (95 MB allocated, but free)
Java version: 1.7.0_51, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Xmx2048M]
Dataset consistency test: No problems found
Plugin: ImageryCache (30135)
Plugin: OpeningHoursEditor (30117)
Plugin: buildings_tools (30057)
Plugin: measurement (30104)
Plugin: mirrored_download (30162)
Plugin: notes (v0.8)
Plugin: osmarender (29854)
Plugin: reverter (30031)
Plugin: turnrestrictions (30237)
Plugin: undelete (30207)
Plugin: utilsplugin2 (30200)
java.lang.NullPointerException
at org.openstreetmap.josm.data.validation.tests.TagChecker.check(TagChecker.java:360)
at org.openstreetmap.josm.data.validation.Test$TagTest.visit(Test.java:123)
at org.openstreetmap.josm.data.osm.Way.accept(Way.java:213)
at org.openstreetmap.josm.data.validation.Test.visit(Test.java:200)
at org.openstreetmap.josm.data.validation.tests.TagChecker.visit(TagChecker.java:464)
at org.openstreetmap.josm.actions.upload.ValidateUploadHook.checkUpload(ValidateUploadHook.java:60)
at org.openstreetmap.josm.actions.UploadAction.checkPreUploadConditions(UploadAction.java:199)
at org.openstreetmap.josm.actions.UploadAction.uploadData(UploadAction.java:222)
at org.openstreetmap.josm.actions.UploadAction.actionPerformed(UploadAction.java:279)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(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)
