The following forum message was posted by mrodent at 
http://sourceforge.net/projects/pydev/forums/forum/293649/topic/4542495:

this is quite irritating: just installed PyDev for Jython on Eclipse.
"sys" is listed as one of the "forced builtins" but when I try to write a simple
prog using sys I get "Undefined variable: sys". + if I go Ctrl-Space to bring
up the builtins in a .py prog page I get a list of builtins which does NOT 
contain
"sys".

This is worked around by going "import sys".

In the book "Definitive Guide to Jython" covering this configuration of
Eclipse/PyDev/Jython it says "PyDev will automatically detect the default, 
global
sys.path entries.  PyDev always infer [sic] the right values...".  Famous last
words.
What does it mean by "global sys.path" entries anyway?  In Eclipse?  In my 
system?
And is this likely to be the cause of the prob?
NB 
1) dir jython2.5.2 (where we find jython.jar) is on my system's PATH
2) specs: WXP, jython 2.5.2, PyDev 2.0.0, Java 1.6.0, Eclipse "Helios" (3.6.1)

thanks for any help

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