Errors with Blojsom Servlet

[Garrett]

Hi folks,

I am getting errors in org.blojsom.servlet.BlojsomServlet:

1.  org.blojsom.fetcher.FetcherException: Blog id: Browsers not found
2.  org.blojsom.fetcher.FetcherException: Blog id:
default$entry.getCategory() not found
3.  org.blojsom.fetcher.FetcherException: Blog id:
default$entry.getCategory() not found
4.   ERROR TP-Processor12429 org.blojsom.servlet.BlojsomServlet -
Plugin not available: referer-log


The last one occurs very frequently. I do not know what it is for; I
found no up-to-date information on wiki.blojsom.com.

Is "referer-log" necessary? Will removing that entry from
blojsom-plugins.xml key="html" make the error go away?

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[Timothy Stone-3]

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On 10/24/09 3:31 AM, Garrett Smith wrote:

> Hi folks,
>
> I am getting errors in org.blojsom.servlet.BlojsomServlet:
>
> 1.  org.blojsom.fetcher.FetcherException: Blog id: Browsers not found
> 2.  org.blojsom.fetcher.FetcherException: Blog id:
> default$entry.getCategory() not found
> 3.  org.blojsom.fetcher.FetcherException: Blog id:
> default$entry.getCategory() not found
> 4.   ERROR TP-Processor12429 org.blojsom.servlet.BlojsomServlet -
> Plugin not available: referer-log

Hmmmm... this looks like you might not have the database fully loaded or
possibly not configured.

Can you provide more details?

>
>
> The last one occurs very frequently. I do not know what it is for; I
> found no up-to-date information on wiki.blojsom.com.
>
> Is "referer-log" necessary? Will removing that entry from
> blojsom-plugins.xml key="html" make the error go away?

You can remove the referrer-log plugin from the plugin chain without
consequence.

>
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> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
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[Timothy Stone-3]

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Some additional details...

On 10/24/09 3:31 AM, Garrett Smith wrote:

> I am getting errors in org.blojsom.servlet.BlojsomServlet:
>
> 1.  org.blojsom.fetcher.FetcherException: Blog id: Browsers not found
> 2.  org.blojsom.fetcher.FetcherException: Blog id:
> default$entry.getCategory() not found
> 3.  org.blojsom.fetcher.FetcherException: Blog id:
> default$entry.getCategory() not found

These look like you have a bad statement in your Velocity template, or
are requesting a category not created.

Are you using a standard template? or a template you developed?

> 4.   ERROR TP-Processor12429 org.blojsom.servlet.BlojsomServlet -
> Plugin not available: referer-log

This last one... looks like a 2.0 holdover that never made it to 3.0,
but got "translated" in the plugin loader for the HTML flavor.

I'm confirming this. As said earlier, it's a safe to remove. The move to
3.0 might have been deferred as "management of referrer spam" outweighed
the usefulness of the plugin.

You can track this at BLOJSOM-263 (http://bit.ly/JtOPh). I've created a
diff patch for the workaround.

>
> The last one occurs very frequently. I do not know what it is for; I
> found no up-to-date information on wiki.blojsom.com.
>
> Is "referer-log" necessary? Will removing that entry from
> blojsom-plugins.xml key="html" make the error go away?
>
-----BEGIN PGP SIGNATURE-----
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Comment: -- Gary Gygax to the Vice Presidential Action Rangers
Comment: Get my public key at http://bit.ly/3H7qS6

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[Garrett]

On Sat, Oct 24, 2009 at 6:49 AM, Timothy Stone
<blojsom.developer@...> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Some additional details...
>
> On 10/24/09 3:31 AM, Garrett Smith wrote:
>
>> I am getting errors in org.blojsom.servlet.BlojsomServlet:
>>
>> 1.  org.blojsom.fetcher.FetcherException: Blog id: Browsers not found

What is "Browsers not found"?

How can I make it log the stack trace?

>> 2.  org.blojsom.fetcher.FetcherException: Blog id:
>> default$entry.getCategory() not found
>> 3.  org.blojsom.fetcher.FetcherException: Blog id:
>> default$entry.getCategory() not found
>
> These look like you have a bad statement in your Velocity template, or
> are requesting a category not created.
>

Some entries are "uncategorized". Is that something that should cause an error?

> Are you using a standard template? or a template you developed?
>
A modified template. The permalinks are rewritten to query strings,
used in JSP. The jsp uses that query string in a c:import, to import
the blojsom blog URL, which exists on the same domain.

I wanted to add a blog to my site, not replace (or replicate) my
entire site in Velocity.

>> 4.   ERROR TP-Processor12429 org.blojsom.servlet.BlojsomServlet -
>> Plugin not available: referer-log
>
> This last one... looks like a 2.0 holdover that never made it to 3.0,
> but got "translated" in the plugin loader for the HTML flavor.
>
> I'm confirming this. As said earlier, it's a safe to remove. The move to
> 3.0 might have been deferred as "management of referrer spam" outweighed
> the usefulness of the plugin.
>

Great. Errors are inefficient. My service was terminated because of
too much CPU time, and errors certainly don't help that.


> You can track this at BLOJSOM-263 (http://bit.ly/JtOPh). I've created a
> diff patch for the workaround.
>

The patch is as mentioned: remove "referer-log" from list of "html"
plugins in blojsom-plugins.xml.

That page says:
"the 3.3 branch has the correction. See comments for more information. "

I have blojsom jars with "3.2" extension. Do the 3.3 jars solve any
memory overhead issues?

Garrett

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[Timothy Stone-3]

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On 10/24/09 2:09 PM, Garrett Smith wrote:

> On Sat, Oct 24, 2009 at 6:49 AM, Timothy Stone
> <blojsom.developer@...> wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Some additional details...
>>
>> On 10/24/09 3:31 AM, Garrett Smith wrote:
>>
>>> I am getting errors in org.blojsom.servlet.BlojsomServlet:
>>>
>>> 1.  org.blojsom.fetcher.FetcherException: Blog id: Browsers not found
>
>
> What is "Browsers not found"?
>
> How can I make it log the stack trace?

The Exception you are citing is thrown in the DatabaseFetcher. It is
telling you that a category named "Browsers" is not found.

Did you create a category called "Browsers"? It is not a default
category, so I fairly safe in saying that it must be a category you are
attempting to create.

>
>>> 2.  org.blojsom.fetcher.FetcherException: Blog id:
>>> default$entry.getCategory() not found
>>> 3.  org.blojsom.fetcher.FetcherException: Blog id:
>>> default$entry.getCategory() not found
>>
>> These look like you have a bad statement in your Velocity template, or
>> are requesting a category not created.

Out of the box, blojsom uses the Velocity Template language
(http://velocity.apache.org/), not JSP (more on that below...). Though
you can switch to the JSPDispatcher.

>>
>
> Some entries are "uncategorized". Is that something that should cause an error?

No. Are you seeing errors from "Uncategorized".

>
>> Are you using a standard template? or a template you developed?
>>
> A modified template. The permalinks are rewritten to query strings,
> used in JSP. The jsp uses that query string in a c:import, to import
> the blojsom blog URL, which exists on the same domain.

If out-of-the-box blojsom is using the Velocity templates (.vm) then the
use of JSTL would not be possible.

Oh, I think I understand... you have a website, and you are linking into
a blojsom instance. The errors shown above though seem to infer that the
link is incorrect. "default" would be your user-id. But the category you
are "fetching" should be something concrete, not a dynamic lookup with JSTL.

Might you send your JSP to me? That would provide some context to what
you are trying to do.

>
> I wanted to add a blog to my site, not replace (or replicate) my
> entire site in Velocity.

No one is asking you to do that. :D

>
>>> 4.   ERROR TP-Processor12429 org.blojsom.servlet.BlojsomServlet -
>>> Plugin not available: referer-log
>>
>> This last one... looks like a 2.0 holdover that never made it to 3.0,
>> but got "translated" in the plugin loader for the HTML flavor.
>>
>> I'm confirming this. As said earlier, it's a safe to remove. The move to
>> 3.0 might have been deferred as "management of referrer spam" outweighed
>> the usefulness of the plugin.
>>
>
> Great. Errors are inefficient. My service was terminated because of
> too much CPU time, and errors certainly don't help that.

Not sure I can help you with the service termination. But the logging
can be configured in the log4j.properties file found at
/WEB-INF/classes/log4j.properties. Change the string "DEBUG" to "INFO"
and restart your servlet container.

BTW, what servlet container are you using? what database backend?

>> You can track this at BLOJSOM-263 (http://bit.ly/JtOPh). I've created a
>> diff patch for the workaround.
>>
>
> The patch is as mentioned: remove "referer-log" from list of "html"
> plugins in blojsom-plugins.xml.
>
> That page says:
> "the 3.3 branch has the correction. See comments for more information. "
>
> I have blojsom jars with "3.2" extension. Do the 3.3 jars solve any
> memory overhead issues?

You should be able to correct in your 3.2 release by selecting
Plugins > Mapping in the Admin interface. Remove "referer-log" from the
HTML flavor list. The "defect" was corrected in the 3.3 code line,
because it was a default setting that should be removed. It doesn't make
sense to correct the code and release it for something that can be fixed
in the admin interface so easily.

Regarding memory allocation. This is not an application problem, but a
container problem. I'm running 3 blojsom 2.3x instances on a single VPS
(virtual private server) with a 540 MB of RAM on a Fedora distro.

You probably need to constrain your container memory requirements. This
is typically a JVM setting. Setting the memory limits is done by setting
a "CATALINA_OPTS" variable in the running user's profile (windows and
unix do this is different ways).

HTH,
Tim
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[Garrett]

On Sat, Oct 24, 2009 at 11:52 AM, Timothy Stone
<blojsom.developer@...> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 10/24/09 2:09 PM, Garrett Smith wrote:
>> On Sat, Oct 24, 2009 at 6:49 AM, Timothy Stone
>> <blojsom.developer@...> wrote:
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA1
>>>
>>> Some additional details...
>>>
>>> On 10/24/09 3:31 AM, Garrett Smith wrote:
>>>
>>>> I am getting errors in org.blojsom.servlet.BlojsomServlet:
>>>>
>>>> 1.  org.blojsom.fetcher.FetcherException: Blog id: Browsers not found
>>
>>
>> What is "Browsers not found"?
>>
>> How can I make it log the stack trace?
>
> The Exception you are citing is thrown in the DatabaseFetcher. It is
> telling you that a category named "Browsers" is not found.
>
> Did you create a category called "Browsers"? It is not a default
> category, so I fairly safe in saying that it must be a category you are
> attempting to create.
>

Yes, there is a Browsers category.

I am only using tags, the category is just noise in the URL.

Whatever blojsom is doing, it is very very slow.

I notice about 7s latency:
http://dhtmlkitchen.com/

Compare to a normal JSP:
http://dhtmlkitchen.com/ape/

>>
>>>> 2.  org.blojsom.fetcher.FetcherException: Blog id:
>>>> default$entry.getCategory() not found
>>>> 3.  org.blojsom.fetcher.FetcherException: Blog id:
>>>> default$entry.getCategory() not found
>>>
>>> These look like you have a bad statement in your Velocity template, or
>>> are requesting a category not created.
>

How can I find which velocity template is causing that error?

> Out of the box, blojsom uses the Velocity Template language
> (http://velocity.apache.org/), not JSP (more on that below...). Though
> you can switch to the JSPDispatcher.
>

I did not know that JSP was an option. Velocity does not work well
with the existing site.


>>>
>>
>> Some entries are "uncategorized". Is that something that should cause an error?
>
> No. Are you seeing errors from "Uncategorized".
>
No.

>>
>>> Are you using a standard template? or a template you developed?
>>>
>> A modified template. The permalinks are rewritten to query strings,
>> used in JSP. The jsp uses that query string in a c:import, to import
>> the blojsom blog URL, which exists on the same domain.
>
> If out-of-the-box blojsom is using the Velocity templates (.vm) then the
> use of JSTL would not be possible.
>
> Oh, I think I understand... you have a website, and you are linking into
> a blojsom instance. The errors shown above though seem to infer that the
> link is incorrect. "default" would be your user-id. But the category you
> are "fetching" should be something concrete, not a dynamic lookup with JSTL.
>
> Might you send your JSP to me? That would provide some context to what
> you are trying to do.
>

Sure.

>>
>> I wanted to add a blog to my site, not replace (or replicate) my
>> entire site in Velocity.
>
> No one is asking you to do that. :D
>

I wanted to use JSP. Can I replace the .vm with .jsp? Where to start with that?

>>
>>>> 4.   ERROR TP-Processor12429 org.blojsom.servlet.BlojsomServlet -
>>>> Plugin not available: referer-log
>>>
>>> This last one... looks like a 2.0 holdover that never made it to 3.0,
>>> but got "translated" in the plugin loader for the HTML flavor.
>>>
>>> I'm confirming this. As said earlier, it's a safe to remove. The move to
>>> 3.0 might have been deferred as "management of referrer spam" outweighed
>>> the usefulness of the plugin.
>>>
>>
>> Great. Errors are inefficient. My service was terminated because of
>> too much CPU time, and errors certainly don't help that.
>
> Not sure I can help you with the service termination. But the logging
> can be configured in the log4j.properties file found at
> /WEB-INF/classes/log4j.properties. Change the string "DEBUG" to "INFO"
> and restart your servlet container.
>

Will do that.

> BTW, what servlet container are you using? what database backend?

Tomcat 6 with MySQL.

>
>>> You can track this at BLOJSOM-263 (http://bit.ly/JtOPh). I've created a
>>> diff patch for the workaround.
>>>
>>
>> The patch is as mentioned: remove "referer-log" from list of "html"
>> plugins in blojsom-plugins.xml.
>>
>> That page says:
>> "the 3.3 branch has the correction. See comments for more information. "
>>
>> I have blojsom jars with "3.2" extension. Do the 3.3 jars solve any
>> memory overhead issues?
>
> You should be able to correct in your 3.2 release by selecting
> Plugins > Mapping in the Admin interface. Remove "referer-log" from the
> HTML flavor list. The "defect" was corrected in the 3.3 code line,
> because it was a default setting that should be removed. It doesn't make
> sense to correct the code and release it for something that can be fixed
> in the admin interface so easily.
>

OK. I'll probably clean up any unused plugins.

> Regarding memory allocation. This is not an application problem, but a
> container problem. I'm running 3 blojsom 2.3x instances on a single VPS
> (virtual private server) with a 540 MB of RAM on a Fedora distro.
>
> You probably need to constrain your container memory requirements. This
> is typically a JVM setting. Setting the memory limits is done by setting
> a "CATALINA_OPTS" variable in the running user's profile (windows and
> unix do this is different ways).
>

I see. The issue is with CPU usage, so I guess that is related to the
memory allocation.

Can you advise me how to investigate the memory usage and see if that
is a likely cause, and, after that, how I can best set CATALINA_OPTS?

I am using a hosting service. They do not seem to know what
CATALINA_OPTS is (I asked).

Thank you.

Garrett

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[Timothy Stone-3]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

The thread is getting somewhat deep so, I'm taking to "top posting," for
brevity sake.

I can't speak for the latency issues, it is likely a problem stemming
from the host, especially if the host restricts CPU time or I/O.

* JSP Dispatcher

Garrett, you can switch to the JSPDispatcher in the Spring configuration
for the blojsom servlet, blojsom.xml.

See http://wiki.blojsom.com/wiki/display/blojsom3/JSP+Dispatcher for
specifics.

After setting the JSP Dispatcher, you will want to update the "Flavor"
settings in the Administrative interface for each flavor, esp. "html"

However, all said, 3.2+ does not come with JSP templates
"out-of-the-box." The JSP templates, formally the default view layer,
can be found in the blojsom-2.0 code line.

% svn co \
https://blojsom.svn.sourceforge.net/svnroot/blojsom/trunk/blojsom-2.0 \
2.0

The 2.0 JSPs should be fairly usable. Using JSPDispatcher will also
allow you to customize as well for you specific needs. I do want to
follow up with out about potential security issues using the
JSPDispatcher (these are JSP security issues, not Dispatcher security
issues).

* Performance Tuning Tomcat

I will have to revisit this with you off the list. I recently upgraded
my Tomcat and lost something in my configuration that would help. And
it's a bit off-topic for the list. :)

Hope this helps get you started in the right direction.

Warmest Regards,
Tim


On 11/3/09 8:27 PM, Garrett Smith wrote:

> On Sat, Oct 24, 2009 at 11:52 AM, Timothy Stone
> <blojsom.developer@...> wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> On 10/24/09 2:09 PM, Garrett Smith wrote:
>>> On Sat, Oct 24, 2009 at 6:49 AM, Timothy Stone
>>> <blojsom.developer@...> wrote:
>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>> Hash: SHA1
>>>>
>>>> Some additional details...
>>>>
>>>> On 10/24/09 3:31 AM, Garrett Smith wrote:
>>>>
>>>>> I am getting errors in org.blojsom.servlet.BlojsomServlet:
>>>>>
>>>>> 1.  org.blojsom.fetcher.FetcherException: Blog id: Browsers not found
>>>
>>>
>>> What is "Browsers not found"?
>>>
>>> How can I make it log the stack trace?
>>
>> The Exception you are citing is thrown in the DatabaseFetcher. It is
>> telling you that a category named "Browsers" is not found.
>>
>> Did you create a category called "Browsers"? It is not a default
>> category, so I fairly safe in saying that it must be a category you are
>> attempting to create.
>>
>
> Yes, there is a Browsers category.
>
> I am only using tags, the category is just noise in the URL.
>
> Whatever blojsom is doing, it is very very slow.
>
> I notice about 7s latency:
> http://dhtmlkitchen.com/
>
> Compare to a normal JSP:
> http://dhtmlkitchen.com/ape/
>
>>>
>>>>> 2.  org.blojsom.fetcher.FetcherException: Blog id:
>>>>> default$entry.getCategory() not found
>>>>> 3.  org.blojsom.fetcher.FetcherException: Blog id:
>>>>> default$entry.getCategory() not found
>>>>
>>>> These look like you have a bad statement in your Velocity template, or
>>>> are requesting a category not created.
>>
>
> How can I find which velocity template is causing that error?
>
>> Out of the box, blojsom uses the Velocity Template language
>> (http://velocity.apache.org/), not JSP (more on that below...). Though
>> you can switch to the JSPDispatcher.
>>
>
> I did not know that JSP was an option. Velocity does not work well
> with the existing site.
>
>
>>>>
>>>
>>> Some entries are "uncategorized". Is that something that should cause an error?
>>
>> No. Are you seeing errors from "Uncategorized".
>>
> No.
>
>>>
>>>> Are you using a standard template? or a template you developed?
>>>>
>>> A modified template. The permalinks are rewritten to query strings,
>>> used in JSP. The jsp uses that query string in a c:import, to import
>>> the blojsom blog URL, which exists on the same domain.
>>
>> If out-of-the-box blojsom is using the Velocity templates (.vm) then the
>> use of JSTL would not be possible.
>>
>> Oh, I think I understand... you have a website, and you are linking into
>> a blojsom instance. The errors shown above though seem to infer that the
>> link is incorrect. "default" would be your user-id. But the category you
>> are "fetching" should be something concrete, not a dynamic lookup with JSTL.
>>
>> Might you send your JSP to me? That would provide some context to what
>> you are trying to do.
>>
> Sure.
>
>>>
>>> I wanted to add a blog to my site, not replace (or replicate) my
>>> entire site in Velocity.
>>
>> No one is asking you to do that. :D
>>
>
> I wanted to use JSP. Can I replace the .vm with .jsp? Where to start with that?
>
>>>
>>>>> 4.   ERROR TP-Processor12429 org.blojsom.servlet.BlojsomServlet -
>>>>> Plugin not available: referer-log
>>>>
>>>> This last one... looks like a 2.0 holdover that never made it to 3.0,
>>>> but got "translated" in the plugin loader for the HTML flavor.
>>>>
>>>> I'm confirming this. As said earlier, it's a safe to remove. The move to
>>>> 3.0 might have been deferred as "management of referrer spam" outweighed
>>>> the usefulness of the plugin.
>>>>
>>>
>>> Great. Errors are inefficient. My service was terminated because of
>>> too much CPU time, and errors certainly don't help that.
>>
>> Not sure I can help you with the service termination. But the logging
>> can be configured in the log4j.properties file found at
>> /WEB-INF/classes/log4j.properties. Change the string "DEBUG" to "INFO"
>> and restart your servlet container.
>>
>
> Will do that.
>
>> BTW, what servlet container are you using? what database backend?
>
> Tomcat 6 with MySQL.
>
>>
>>>> You can track this at BLOJSOM-263 (http://bit.ly/JtOPh). I've created a
>>>> diff patch for the workaround.
>>>>
>>>
>>> The patch is as mentioned: remove "referer-log" from list of "html"
>>> plugins in blojsom-plugins.xml.
>>>
>>> That page says:
>>> "the 3.3 branch has the correction. See comments for more information. "
>>>
>>> I have blojsom jars with "3.2" extension. Do the 3.3 jars solve any
>>> memory overhead issues?
>>
>> You should be able to correct in your 3.2 release by selecting
>> Plugins > Mapping in the Admin interface. Remove "referer-log" from the
>> HTML flavor list. The "defect" was corrected in the 3.3 code line,
>> because it was a default setting that should be removed. It doesn't make
>> sense to correct the code and release it for something that can be fixed
>> in the admin interface so easily.
>>
>
> OK. I'll probably clean up any unused plugins.
>
>> Regarding memory allocation. This is not an application problem, but a
>> container problem. I'm running 3 blojsom 2.3x instances on a single VPS
>> (virtual private server) with a 540 MB of RAM on a Fedora distro.
>>
>> You probably need to constrain your container memory requirements. This
>> is typically a JVM setting. Setting the memory limits is done by setting
>> a "CATALINA_OPTS" variable in the running user's profile (windows and
>> unix do this is different ways).
>>
>
> I see. The issue is with CPU usage, so I guess that is related to the
> memory allocation.
>
> Can you advise me how to investigate the memory usage and see if that
> is a likely cause, and, after that, how I can best set CATALINA_OPTS?
>
> I am using a hosting service. They do not seem to know what
> CATALINA_OPTS is (I asked).
>
> Thank you.
>
> Garrett

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[Garrett]

On Thu, Nov 5, 2009 at 5:14 PM, Timothy Stone
<blojsom.developer@...> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> The thread is getting somewhat deep so, I'm taking to "top posting," for
> brevity sake.
>
> I can't speak for the latency issues, it is likely a problem stemming
> from the host, especially if the host restricts CPU time or I/O.
>

They provide limits, but do not have a way to enforce that.

Can you advise me how to investigate the memory usage and see if that
is a likely cause, and, after that, how I can best set CATALINA_OPTS?

[snip top post]

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