Exceptional trial, which is being televised, comes at a time of renewed political tensions in the oil rich country.
Army chief Ahmed Gaid Salah says the military will not support any candidate in presidential polls expected in December.
Judges began an open-ended strike on October 27 demanding independence for the judiciary after a massive reshuffle.
Demonstrators reject call by powerful army chief to hold presidential election by December and demand his removal.
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Members of the military will seize cars entering the capital for protests, Lieutenant-General Ahmed Gaid Salah says.
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The army chief and ruling elite have been refusing the protesters' calls to step down.
Thousands rally in Algiers and other major cities to call for political overhaul and removal of ruling elite.
Gaid Salah rejects opposition's preconditions, says elections are needed to end crisis in North African country.