I should also mention, that the problem does not occur unless I am using
Freemarker templates. Using JSP pages, I do not have any problems with the
\u0000 characters.
Geoff Shuetrim
On 3 June 2012 16:59, Geoff Shuetrim <ge...@galexy.net> wrote:
> I have tracked down the source of the U+0000 characters in the Stripes
> code base. They are being inserted into the output generated by the
> LayoutWriter class, when changing whether the "Silent" status of the
> writer. I am not sure quite what that status affects, but during the
> toggling of the silent status, the setSilent(boolean, PageContext) method
> includes the following statement:
>
> pageContext.getOut().write(TOGGLE);
>
> The value of TOGGLE is 0, which the writer inserts into the UTF-8 document
> as \u0000.
>
> The documentation indicates that TOGGLE is the control character that,
> when encountered in the output stream, toggles the silent state.
>
> If I comment out that statement, then the problematic \u0000 characters do
> not appear in my HTML output and so software, like the Facebook crawler, is
> able to understand my page content. I could change the character to
> something else that is problematic in HTML 5 pages (The
> http://html5.validator.nu/ picks them up as a problem.) but I am not sure
> what could be used that might not already occur in a page for other
> reasons, signaling a "toggle" when one is not appropriate.
>
> There do not appear to be any other untoward side effects for my site that
> result from eliminating this character insertion but making this kind of
> change gives me concerns given that I still do not really understand what
> the silent and non-silent states imply.
>
> Some guidance on what the TOGGLE character is doing for me would be really
> helpful at this stage.
>
> Thanks for any thoughts on this issue.
>
> Geoff Shuetrim
>
> Background information:
>
> I have been doing my testing using the source code for Stripes release
> 1.3.7 and Freemarker 2.3.19 and using a Tomcat 6 server. The combination
> of Stripes 1.3.7 and Freemarker 2.3.19 seems to also raise another problem
> in relation to dynamic attributes on the Stripes layout-render tag but I
> will deal with that in a separate email.
>
>
>
> On 29 May 2012 12:38, Geoff Shuetrim <ge...@galexy.net> wrote:
>
>> I have only recently noticed that when I use Stripes layout tags, I am
>> getting unexpected U+0000 characters added to the pages where the stripes
>> layout tags were. In a hex editor, these characters are 00.
>>
>> You can see (or actually you need an editor like emacs to kind of see)
>> these characters if you look at the page source for
>> http://www.gaiaguide.info/do/Hierarchy
>>
>> That page is running on Stripes 1.5.6 but in a test environment I can
>> replicate the generation of these characters with the latest versions of
>> Stripes and Freemarker.
>>
>> These characters are causing me problems with page scrapers like that
>> used by Facebook, which encounter the characters and then decide that they
>> cannot see the page (and so links shared from the site get no useful
>> information added to them by Facebook).
>>
>> You can see this by feeding the example URL to:
>>
>> http://developers.facebook.com/tools/debug
>>
>> and to:
>>
>> http://html5.validator.nu/
>>
>> This HTML5 validator picks out the U+0000 characters clearly.
>>
>> A working page on the same server is at
>> http://www.gaiaguide.info/Test.jsp
>>
>> Any pointers to the parts of the Stripes source where I can start to look
>> for how these are being generated would be much appreciated.
>>
>> Thanks
>>
>> Geoff Shuetrim
>>
>>
>
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