java.lang.NoSuchFieldError：completementKey

Question

When I'm trying to start my Derby Network Server, I'm getting this exception. This has never happened before and I don't now what's the cause of problem. Any ideas?

Exception in thread "main" java.lang.NoSuchFieldError: completionKey
at sun.nio.fs.WindowsNativeDispatcher.initIDs(Native Method)
at sun.nio.fs.WindowsNativeDispatcher.<clinit>(Unknown Source)
at sun.nio.fs.WindowsLinkSupport.getRealPath(Unknown Source)
at sun.nio.fs.WindowsPath.toRealPath(Unknown Source)
at sun.nio.fs.WindowsPath.toRealPath(Unknown Source)
at sun.util.calendar.ZoneInfoFile$1.run(Unknown Source)
at sun.util.calendar.ZoneInfoFile$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.util.calendar.ZoneInfoFile.<clinit>(Unknown Source)
at sun.util.calendar.ZoneInfo.getTimeZone(Unknown Source)
at java.util.TimeZone.getTimeZone(Unknown Source)
at java.util.TimeZone.setDefaultZone(Unknown Source)
at java.util.TimeZone.getDefaultRef(Unknown Source)
at java.util.TimeZone.getDefault(Unknown Source)
at java.text.SimpleDateFormat.initializeCalendar(Unknown Source)
at java.text.SimpleDateFormat.<init>(Unknown Source)
at java.text.DateFormat.get(Unknown Source)
at java.text.DateFormat.getDateInstance(Unknown Source)
at org.apache.derby.iapi.tools.i18n.LocalizedResource.init(Unknown Source)
at org.apache.derby.iapi.tools.i18n.LocalizedResource.<init>(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.init(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.<init>(Unknown Source)
at org.apache.derby.drda.NetworkServerControl.main(Unknown Source)

Answer 1

This is an Error (!) that is due to running code that was compiled against a class with a field and executing it with another (compiled) version without that field.

Go back and check installed versions, recompile everything, etc. etc-