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Problem is somewhat "solved" after all day of dorking around. What I eventually did was this:
1. Stumbled onto the Help / Export logs menu item, which shows a log of things that didn't work out when starting up TOS.
2. One of those things had to do with the properties file for this component - I had to remove the FAMILY entry there, and then create a section in tGSpreadsheetInput_java.xml like so:
<FAMILIES>
<FAMILY>MyStuff</FAMILY>
</FAMILIES>
3. The whole p. 22 instruction in the UG doesn't seem to do anything at all, aside from reliably raising my blood pressure.
4. So I ended up copying the tGSpreadsheetInput folder right to "C:\Talend\TOS-Win32-r63143-V4.2.2\plugins\org.talend.designer.components.localprovider_4.2.2.r63143\components", and restarted TOS and now it shows up.
Thanks for following along...
An update... its an old thread but it might confuse new users who are looking for a solution. The situation described above is most likely specific to a bug in the google component.
The recommended method for loading new components is explained (somewhat poorly) in the Studio Users Guide, its just hidden in a place you dont expect to find it. Find the section titled "External or User components", its in the "Getting Started/Customizing project Settings" section.
Basically the process is you put your user components in a directory somewhere. Then tell Talend Studio where they are, and it imports them into its internal directory structure. Then they appear on your palette. No need to navigate the complex intenal directory structure or restart Studio.