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Is HTML rendering truly p

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  Is HTML rendering truly p "Phil Powell" <phil.powell@THRWHITE.remove-dii-this> - 2011-04-27 15:31 +0000
    Re: Is HTML rendering tru "Natasha Lloyd" <natasha.lloyd@THRWHITE.remove-dii-this> - 2011-04-27 15:31 +0000
    Re: Is HTML rendering tru "Oliver Wong" <oliver.wong@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
      Re: Is HTML rendering tru "Rogan Dawes" <rogan.dawes@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000

#1171 — Is HTML rendering truly p

  To: comp.lang.java.gui
I've noticed that there are a lot of bugs in the Sun bugs db related
specifically to HTML rendering using javax.swing.JEditorPane.

I wrote a class extending JEditorPane that I thought should allow for
"safer" HTML rendering, but on occasions I still get an
ArrayIndexOutOfBoundsException: -1 or EmptyStackException when trying
to use setText().

Here is the exception stack:

java.util.EmptyStackException
        at java.util.Stack.peek(Stack.java:85)
        at javax.swing.text.DefaultStyledDocument
$ElementBuffer.insertElement(DefaultStyledDocument.java:1667)
        at javax.swing.text.DefaultStyledDocument
$ElementBuffer.insertUpdate(DefaultStyledDocument.java:1405)
        at javax.swing.text.DefaultStyledDocument
$ElementBuffer.insert(DefaultStyledDocument.java:1275)
        at
javax.swing.text.DefaultStyledDocument.insert(DefaultStyledDocument.java:
199)
        at javax.swing.text.html.HTMLDocument.insert(HTMLDocument.java:
242)
        at javax.swing.text.html.HTMLDocument
$HTMLReader.flushBuffer(HTMLDocument.java:3325)
        at javax.swing.text.html.HTMLDocument
$HTMLReader.addContent(HTMLDocument.java:3265)
        at javax.swing.text.html.HTMLDocument
$HTMLReader.addContent(HTMLDocument.java:3230)
        at javax.swing.text.html.HTMLDocument
$HTMLReader.handleText(HTMLDocument.java:2180)
        at
javax.swing.text.html.parser.DocumentParser.handleText(DocumentParser.java:
241)
        at javax.swing.text.html.parser.Parser.handleText(Parser.java:
345)
        at javax.swing.text.html.parser.Parser.endTag(Parser.java:427)
        at javax.swing.text.html.parser.Parser.parseTag(Parser.java:
1807)
        at
javax.swing.text.html.parser.Parser.parseContent(Parser.java:2044)
        at javax.swing.text.html.parser.Parser.parse(Parser.java:2211)
        at
javax.swing.text.html.parser.DocumentParser.parse(DocumentParser.java:
105)
        at
javax.swing.text.html.parser.ParserDelegator.parse(ParserDelegator.java:
73)
        at javax.swing.text.html.HTMLEditorKit.read(HTMLEditorKit.java:
230)
        at javax.swing.JEditorPane.read(JEditorPane.java:556)
        at javax.swing.JEditorPane.read(JEditorPane.java:584)
        at javax.swing.JEditorPane$PageLoader.run(JEditorPane.java:
647)

The page loads just fine (albeit very VERY slowly), but these annoying
exceptions occur frequently and I have no way of catching them.

All this to ask: Is Java reliable for HTML rendering or should I bag
the idea that Java can do this?

Phil

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#1174 — Re: Is HTML rendering tru

  To: comp.lang.java.gui
> All this to ask: Is Java reliable for HTML rendering or should I bag
> the idea that Java can do this?

The problem is not with Java the language, but with the component
JEditorPane. More specifically, the problem is in the default
HTMLEditorKit that is used by JEditorPane to render the HTML. As it
says in the docs, the HTMLEditorKit only supports HTML 3.2, which is
pretty inadequate nowadays.

Instead of extending JEditorPane, you should probably look into third-
party packages that are meant to handle this problem. I can't
personally recommend any good free ones, but you can take a look at
this website, which reviews a few: http://today.java.net/pub/a/today/2004/05/24/html-pt1.html.
That website is pretty old (3 years) so you should just do a Google
search for "Java HTML renderer" and take a look at what comes up.

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#1263 — Re: Is HTML rendering tru

  To: comp.lang.java.gui

"Phil Powell" <phillip.s.powell@gmail.com> wrote in message 
news:1173884498.618700.141780@n59g2000hsh.googlegroups.com...
[OP has had problems with JEditorPane and HTML]
>
> All this to ask: Is Java reliable for HTML rendering or should I bag
> the idea that Java can do this?

    Java, the programming language, is just as suitable as any other 
programming language for HTML rendering (see 
http://en.wikipedia.org/wiki/Turing_complete).

    One specific piece of code written in Java (e.g. JEditorPane) may be 
bad at rendering HTML, just like one specific piece of code written in any 
language might be bad at rendering HTML.

    You may be interested in http://jrex.mozdev.org/ among other Java HTML 
projects.

    - Oliver

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#1264 — Re: Is HTML rendering tru

  To: comp.lang.java.gui
Oliver Wong wrote:
> "Phil Powell" <phillip.s.powell@gmail.com> wrote in message 
> news:1173884498.618700.141780@n59g2000hsh.googlegroups.com...
> [OP has had problems with JEditorPane and HTML]
>> All this to ask: Is Java reliable for HTML rendering or should I bag
>> the idea that Java can do this?
> 
>     Java, the programming language, is just as suitable as any other 
> programming language for HTML rendering (see 
> http://en.wikipedia.org/wiki/Turing_complete).
> 
>     One specific piece of code written in Java (e.g. JEditorPane) may be 
> bad at rendering HTML, just like one specific piece of code written in any 
> language might be bad at rendering HTML.
> 
>     You may be interested in http://jrex.mozdev.org/ among other Java HTML 
> projects.
> 
>     - Oliver 
> 
> 

Also take a look at xhtmlrenderer at dev.java.net

Rogan

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