Potential backward compatibility issues in Joomla 2.5 and Joomla Platform 11.4

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Revision as of 11:00, 10 January 2012 by Realityking (Talk | contribs)

This documents track potential backward compatibility issues for Joomla 2.5 and Joomla Platform 11.4 which will be included in Joomla 2.5. Listed are issues which potentially breaks extensions and newly deprecated APIs. Please help making this document complete.

The base of this comparison is Joomla 1.7/Platform 11.2.

Backwards compatibility issues were also tracked for Joomla 1.7: Potential backward compatibility issues in Joomla 1.7 and Joomla Platform 11.1



  • All class members except JFTP::$instances have become private


  • JError::$_error has become protected


  • JRequest::_cleanArray has been removed


  • The following class member have become private:
    • JArchiveGzip:: $_flags
    • JArchiveGzip:: $_data
    • JArchiveTar:: $_types
    • JArchiveTar:: $_flags
    • JArchiveTar:: $_data
    • JArchiveTar:: $_metadata
    • JArchiveZip:: $_methods
    • JArchiveZip:: $_ctrlDirHeader
    • JArchiveZip:: $_ctrlDirEnd
    • JArchiveZip:: $_fileHeader
    • JArchiveZip:: $_data


  • The following class members have become private:
    • JSimpleXML:: $_parser
    • JSimpleXML:: $_xml
    • JSimpleXML:: $_stack


  • In JComponentHelper::renderComponent the execution of the component is moved to the new function JComponentHelper::executeComponent. This means that a component cannot change or use any of the (internal) variables of renderComponent that might be used by the function later on, like $task or $option. Solution is to get the values, via JRequest, in the component itself.


Plug-in events

  • onPrepareUserProfileData has been removed. Instead respond to onContentPrepareData with a context of com_users.profile