Unknown Source

[Paul Keohan]

What does the 'Unknown Source' in parentheses mean in the following exception stack?

 java.lang.NullPointerException
at javax.swing.AbstractButton$AccessibleAbstractButton.getCharCount(Unknown Source)
at com.ibm.sns.svk.AccessibleTextCVI.fillItemColEntries(AccessibleTextCVI.java:168)
at com.ibm.sns.svk.ItemColManager.computeView(ItemColManager.java:874)
at com.ibm.sns.svk.ItemColManager.getItemCount(ItemColManager.java:814)
at com.ibm.sns.svk.AccessEngine.getItemCount(AccessEngine.java:430)
at com.ibm.sns.svk.TaskTools.inView(TaskTools.java:652)
at com.ibm.sns.svk.TaskTools.getComponent(TaskTools.java:528)
at com.ibm.sns.svk.perks.DefaultPerk$ViewChange.execute(DefaultPerk.java:1297)
at com.ibm.sns.svk.Tier.Execute(Tier.java:1092)
at com.ibm.sns.svk.Tier.ManageViewChange(Tier.java:624)
at com.ibm.sns.svk.Perkolator.ManageViewChange(Perkolator.java:415)
at com.ibm.sns.svk.EventManager$EventProcessor$ViewChangeEvent.Execute(EventManager.java:1398)
at com.ibm.sns.svk.EventManager$EventProcessor.ProcessEvents(EventManager.java:1042)
at com.ibm.sns.svk.EventManager$EventManagerTimer.run(EventManager.java:911)
at java.lang.Thread.run(Unknown Source) 

[Joel McNary]

It means that there is no debugging information for the stack trace to provide a source code file name and line number for that place in the stack.

[Cindy Glass]

Typically you get that if the source is JNI or perhaps a Corba Tool, etc.