Java lost after crash while updating, can't seem to get it back

hi,
while running software update, my computer crashed and i seem to have lost java.
i've dowloaded a number of jse releases.
most of them didn't work, one did:
java15release1
however, when trying to install:
j2se50 release 1-5, i got the alert
"unable to locate java on this volume" (yes it's the right volume)
i got these errors before and after the succesfull install.
i tried renstalling that one, but it doesn't help.
java is unrecognized in terminal, max-msp (a music app) and the sun's test site crashed firefox.
so, would be nice if anyone could help, i tried some things i found by searching, but they came down to what i had tried already.
pity, was just about to take on java programming...
btw i have the developers tools installed if that might matter.
thanks in advance
isjtar

hmmm this seems to slip downpage really easily, please don't mind me for bumping it.
best
isjtar

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