When save the file

[kshatriy]

The program was launched in compatibility mode with Windows 2000, because in normal mode immediately when you start I get an error something like "Unable to find the main method JOSM".
Program started successfully, download the data selection. Then click the File / Save As, and dropped this error. Error text:

Repository Root: ​http://josm.openstreetmap.de/svn
Build-Date: 2010-07-17 01:31:31
Last Changed Author: bastiK
Revision: 3376
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: ​http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-07-16 23:44:00 +0200 (Fri, 16 Jul 2010)
Last Changed Rev: 3376

Identification: JOSM/1.5 (3376 ru)
Memory Usage: 69 MB / 494 MB (14 MB allocated, but free)
Java version: 1.6.0_20, Sun Microsystems Inc., Java HotSpot(TM) Client VM
Operating system: Windows 2000
Dataset consistency test: No problems found

Plugin: openstreetbugs (21706)
Plugin: remotecontrol (21706)
Plugin: validator (22204)
Plugin: wmsplugin (22286)

java.lang.NullPointerException

at javax.swing.JComponent.repaint(Unknown Source)
at sun.swing.FilePane$2.repaintListSelection(Unknown Source)
at sun.swing.FilePane$2.repaintSelection(Unknown Source)
at sun.swing.FilePane$2.focusLost(Unknown Source)
at java.awt.AWTEventMulticaster.focusLost(Unknown Source)
at java.awt.Component.processFocusEvent(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.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(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.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$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Unknown Source)
at javax.swing.JFileChooser.showDialog(Unknown Source)
at javax.swing.JFileChooser.showSaveDialog(Unknown Source)
at org.openstreetmap.josm.actions.SaveActionBase.createAndOpenSaveFileChooser(SaveActionBase.java:181)
at org.openstreetmap.josm.actions.SaveActionBase.openFileDialog(SaveActionBase.java:126)
at org.openstreetmap.josm.actions.SaveAsAction.getFile(SaveAsAction.java:31)
at org.openstreetmap.josm.actions.SaveActionBase.doSave(SaveActionBase.java:55)
at org.openstreetmap.josm.actions.SaveActionBase.doSave(SaveActionBase.java:44)
at org.openstreetmap.josm.actions.SaveActionBase.actionPerformed(SaveActionBase.java:33)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$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.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)

[stoecker]

Looks much like other similar errors. Very likely an problem in your Java installation. Try reinstalling Java and report results.

[kshatriy]

By the way, the file at that time still managed to save, re-run the save procedure.
We reinstalled Java, but still an error when running:
"Could not find the main class: JOSM. Program will exit"
In compatibility mode with Windows 2000 is running successfully, the procedure to save a file as a success.