SalesForce.Com Issues/Gotchas aka. Bugs/Defects (again !!!)

Yet another undocumented SalesForce Bug has been found !!!

This bring my personal count to 4 and climbing…

It is rather odd these kinds of defects can exist in such a prestigious framework as SalesForce/VisualForce/Apex with so many people using it when other web-based Frameworks (Django and others) do NOT exhibit such behaviors.

I have revised #2 and #3 while adding some additional issues since my last post:  (This is where experience counts… since I know what is expected when unexpected things begin to happen…)

SalesForce.Com Issues/Gotchas aka. Bugs/Defects (Redux)

1. Cannot reference null values for <apex:outputText/> or <apex:inputText/>.
2. Cannot reference non-String objects with <apex:outputText/> or <apex:inputText/>.

1. Under some circumstances VisualForce will allow String objects to be referenced by <apex:outputText/> or <apex:inputText/> tags however after a certain threshold has been reached the Force IDE will begin to complain about what it calls SObject references after which the only acceptable correction is to reference the result from a SOQL query – this can clash with #2 for some obvious reasons.
2. VisualForce/Apex cannot handle instance variables that contain “_” underscores in variable names nor can Custom Field names be used from SOQL Queries in this manner.

Cannot retrieve the Parameters from ApexPages.currentPage() more than exactly once because the associated [Parameters] information is lost for subsequent invocations.

Cannot pass back the ApexPages.currentPage() when expecting the user to make a correction in the <apex:inputText/> because the VisualForce page will remember the values from the Parameters thus ignoring user inputs for subsequent form posts.

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SalesForce.Com Issues/Gotchas aka. Bugs/Defects (Redux)

Yet another undocumented SalesForce Bug has been found !!!

This bring my personal count to 4 and climbing…

It is rather odd these kinds of defects can exist in such a prestigious framework as SalesForce/VisualForce/Apex with so many people using it when other web-based Frameworks (Django and others) do NOT exhibit such behaviors.

I have revised #2 and #3 while adding some additional issues since my last post:  (This is where experience counts… since I know what is expected when unexpected things begin to happen…)

SalesForce.Com Issues/Gotchas aka. Bugs/Defects

1). Cannot reference null values for <apex:outputText/> or <apex:inputText/>.
2). Cannot reference non-String objects with <apex:outputText/> or <apex:inputText/>.
2a). Under some circumstances VisualForce will allow String objects to be referenced by <apex:outputText/> or <apex:inputText/> tags however after a certain threshold has been reached the Force IDE will begin to complain about what it calls SObject references after which the only acceptable correction is to reference the result from a SOQL query – this can clash with #2 for some obvious reasons.
3). Cannot retrieve the Parameters from ApexPages.currentPage() more than exactly once because the associated [Parameters] information is lost for subsequent invocations.
4). Cannot pass back the ApexPages.currentPage() when expecting the user to make a correction in the <apex:inputText/> because the VisualForce page will remember the values from the Parameters thus ignoring user inputs for subsequent form posts.

Programming Test sponsored by NASA and RackSpace *yawn*

Programming Tests that have no bearing on the reality of software engineering are a real hoot – this one comes to us from NASA and RackSpace – I especially liked the one from my early childhood – the one that counts coins… LOL

Enjoy !!!

dev project 3 – Voccio

dev project 3 – Voccio (response on 11-17-2011)

SalesForce.Com Issues/Gotchas aka. Bugs/Defects

SalesForce.Com Issues/Gotchas aka. Bugs/Defects

These are aspects of SalesForce/Apex [current version in-use as of the date of this post] that don’t actually conform to the general way one might expect this platform to behave.

The really cool thing is that none of these issues/gotchas/defects/bugs result in a lack of expected behavior without error/warning or comment.

• Cannot reference null values for <apex:outputText/> or <apex:inputText/>.

• This is to say whenever a null value is retrieved from a SOQL statement that value will cause the desired <apex:outputText/> or <apex:inputText/>.
• It seems the code responsible for rendering the <apex:outputText/> or <apex:inputText/> cannot function whenever the value being displayed is null – this is NOT the expected behavior since one can just as easily deal with rendering a null value by casting a null to String using the following code fragment: ”   ”+value_containing_null+”   “.

Cannot reference Datetime objects with <apex:outputText/> or <apex:inputText/>.

• This is to say the the only valid data type for Input/Output operations is a non-null String value, all other values will result in a lack of desired functionality.
• It seems the code responsible for rendering a non-String value cannot deal with a type cast to String – this is not such a huge problem as one might think since most OOP programming languages provide a method for rending any type to String however for some unexpected reason this is not the case with Apex.

Cannot retrieve the ApexPages.currentPage() more than exactly once because the associated information is lost for subsequent invocations.

• This is to say the ApexPages.currentPage() can only retrieve valid values for ApexPages.currentPage().getParameters() exactly once and never again; subsequent invocations will NOT provide the same values for ApexPages.currentPage().getParameters() that were provided in the initial invocation.
• This is a most curious defect because ApexPages.currentPage().getParameters() does nothing more than retrieve the POST/GET variables from the Request however this is NOT the case with Apex.

So you want to build a slick Video Chat Service of your own based on Python, RTMP and Flash

Here’s the Research you might want to focus on:

• http://stackoverflow.com/questions/2267952/python-flv-media-file-conversion
• http://hackaday.com/2010/10/02/decoding-mp3-in-python/
• http://lscube.org/book/export/html/14
• http://pypi.python.org/pypi/fmspy
• https://www.google.com/search?rlz=1C1CHFX_enUS441US441&gcx=w&sourceid=chrome&ie=UTF-8&q=python+ffmpeg+live+streaming#sclient=psy-ab&hl=en&rlz=1C1CHFX_enUS441US441&source=hp&q=h.264+flash+video+player+using+as3&pbx=1&oq=h.264+flash+video+player+using+as3&aq=f&aqi=&aql=&gs_sm=e&gs_upl=13885l16021l9l16249l10l9l0l0l0l0l213l1215l4.4.1l9l0&bav=on.2,or.r_gc.r_pw.r_cp.,cf.osb&fp=adbe7eb5f26dc000&biw=1231&bih=762
• http://www.wowza.com/h.264.html
• http://highscalability.com/blog/2010/3/16/justintvs-live-video-broadcasting-architecture.html
• http://www.ehow.com/how_8749182_install-ffmpeg-using-python.html
• https://streamapi.com/
• http://www.rtmpy.org/index.html
• http://code.google.com/p/pyffmpeg/
• http://stackoverflow.com/questions/4360718/django-streaming-h-264-video-with-filewrapper-html5
• http://stream-recorder.com/forum/showthread.php?t=39347
• http://code.google.com/p/rtmplite/
• http://dev.rtmpy.org/wiki/SimpleMediaPlayer
• http://code.google.com/p/slyseal/
• http://wiki.gnashdev.org/Streaming_Media_Servers
• http://svef.netgroup.uniroma2.it/
• http://stackoverflow.com/questions/5196916/udp-server-in-python-for-live-streaming-of-recorded-audio-from-a-radio-to-a-clie
• http://www.video-to-flash.com/products/
• http://code.google.com/p/videocity/
• http://samirghimire.wordpress.com/2011/03/04/webcam-streaming-using-python-and-gstreamer/

So I got all twisted 4 long years ago…

This is how twisted I was 4 long years ago…  it never occurred to me anyone might have thought the twisted framework was anything but super easy to use 😉

Enjoy the download…  twisted-11-19-2007 (believe it or not… this code comes right out of 11-19-2007… Disclaimer: Some of this code may be from Open Source sources… nothing like stating the obvious…)

See also:

What is the Twisted Framework ?!?

What is the Twisted Framework ?!?

Every so often I am asked to describe certain frameworks like the Twisted Framework and this is my response for that one.

The Twisted Framework (Disclaimer: Some of the code in this document was written by Ray C Horn but the rest was not since it may be from some Open Source sources… nothing like stating the obvious…)