javax.swing.JEditorPane throws an Exception, for this particular
    version of korean html file.

    - the html syntax of the file is okay
     I confirmed that the html file is okay from syntax point of view,
     thus it can be displayed correctly with other html browsers.

   - happens for one locale only out of 10 locales
     (in this case, ko, by chance)
     Other language versions of files(syntax, format is exactly the same
     with korean file, except the language and encoding) are okay.
     This issue can be reproduced for ko locale only by chance, but it may
     happen for other locales, if we slightly modify it.


   - even in the same locale(ko), slightly different versions of files
     are okay.
     see attached html files and the test result.
     
     title_xx.html.#

     (where xx is locale, and # is file variant number)


     Table-1: whether exception is thrown or not when
              running sample code(SwingHelp.java)

     number/ 1 2 3 4 5
     locale
     -------------------------------------------------------
     en No No No No No
     ko No Yes No No No
     ja No No No No No
     other 7 No No No No No
     -------------------------------------------------------


     title_xx.html.1 (original file: 4 <li> tags included between
                      2nd <ul></ul> tag pair)
     title_xx.html.2 (remove 2 <li> tags from the original)
     title_xx.html.3 (remove 2 <li> tags but different tags from #2)
     title_xx.html.4 (remove 1 <li> tags from the original)
     title_xx.html.5 (remove <meta> tag from #2)


     This result indicates that it is very context sensitive, and
     it is very rare this happens. We can not predict when this happens
     in which locale, nor what change makes this happen.



   - if we delete <meta> tag for charset, no exception occurs.
     
     e.g. <meta http-equiv="Content-Type" content="text/html; charset=euc-kr">
    
     title_ko.html.2 has problem displaying,
     title_ko.html.5 is exactly the same as #2, except <meta> tag.

     But ofcourse without <meta> tag, localized html files can not be
     displayed correctly. It is interesting result and it indicates
     that this problem is caused by internal behaviour of JEditorPane.


------ Result of running the sample code with ko file #2 ------
java.util.EmptyStackException
        at java.lang.Throwable.fillInStackTrace(Native Method)
        at java.lang.Throwable.fillInStackTrace(Compiled Code)
        at java.lang.Throwable.<init>(Compiled Code)
        at java.lang.Exception.<init>(Compiled Code)
        at java.lang.RuntimeException.<init>(Compiled Code)
        at java.util.EmptyStackException.<init>(Compiled Code)
        at java.util.Stack.peek(Compiled Code)
        at javax.swing.text.DefaultStyledDocument$ElementBuffer.insertElement(Compiled Code)
        at javax.swing.text.DefaultStyledDocument$ElementBuffer.insertUpdate(Compiled Code)
        at javax.swing.text.DefaultStyledDocument$ElementBuffer.insert(DefaultStyledDocument.java:1211)
        at javax.swing.text.DefaultStyledDocument.insert(Compiled Code)
        at javax.swing.text.html.HTMLDocument.insert(HTMLDocument.java:216)
        at javax.swing.text.html.HTMLDocument$HTMLReader.flushBuffer(HTMLDocument.java:2678)
        at javax.swing.text.html.HTMLDocument$HTMLReader.flush(HTMLDocument.java:1631)
        at javax.swing.text.html.HTMLEditorKit.read(HTMLEditorKit.java:244)
        at javax.swing.JEditorPane.read(JEditorPane.java:404)
        at javax.swing.JEditorPane.read(JEditorPane.java:422)
        at javax.swing.JEditorPane$PageLoader.run(JEditorPane.java:450)
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