Help topic can't display the proper HTML format for 5u26b30 cte test.
Testsuite name: CTE Regressions manual
JDK/JRE tested: 5u26b30-j4b (jdkfb-1_5_0_26-ea-bin-b30-windows-i586-p-02_jul_2010.exe)
OS/architecture: win7-ultimate-x86
Reproducible: Always
Is it a platform specific regression: N
Is it a Regression: Not sure

Steps to reproduce:
1. Launch the case java/net/URLConnection/4407646/Test4407646.java.
  Open IE browser and load the following page
     https://jpseuwt-ap/testcases/131/4407646/helptest/HelpTest.html
 On the 'Security Alert' page press 'ok' and 'yes' to proceed
2. On the browser there will be a button 'Help!', click that button
3. Press 'NO' on 'An applet would like to print' question
 JavaHelp window will appear
 
Check:
A Help window will pop up on Left side, the table of contents is displayed correctly and on Right side
If the help topics themselves are displayed in plain text, with the HTML formatting tags being displayed instead of being used.
   - test FAILED
If the help topic displayed in proper HTML format, test PASSED

Actual behavior:
Help topic can't display proper HTML format. And click any contents on left side of help window, java.lang.NullPointerException thrown in java console.
Please refer to the attachment file help.jpg. Normally picture is help_normal.jpg.

Exceptions:
Using URL: https://jpseuwt-ap/testcases/131/4407646/helptest/Help/Sentences_Online_Help.hs
Exception in thread "Thread-8" java.lang.NullPointerException
         at javax.swing.text.html.parser.Parser.errorContext(Unknown Source)
         at javax.swing.text.html.parser.Parser.parse(Unknown Source)
         at javax.swing.text.html.parser.DocumentParser.parse(Unknown Source)
         at javax.swing.text.html.parser.ParserDelegator.parse(Unknown Source)
         at javax.swing.text.html.HTMLEditorKit.read(Unknown Source)
         at javax.swing.JEditorPane.read(Unknown Source)
         at javax.swing.JEditorPane$PageLoader.run(Unknown Source)

Validation:
1. same platform/ 5u25b03-j4b(jdkfb-1_5_0_25-fcs-bin-b03-windows-i586-p-15_jun_2010.exe): pass
2. winxppro-sp3-x86/same build : fail