The developments highlight the resilience of extremists in Indonesia despite a sustained crackdown by authorities over the last decade that has severely weakened them.
Militants with links to al-Qaeda were responsible for a series of bloody and spectacular attacks against Western civilian targets in the 2000s.
Sigit Indrajit was the third person to be found guilty in the foiled attack on the Myanmar embassy last year, which he and other defendants have said was intended as an act of retaliation against Buddhist-majority Myanmar for attacks there on ethnic Rohingya Muslims.
Indrajit, 23, showed no remorse after judges at the South Jakarta District Court sentenced him to seven-and-a-half years for violating anti-terror laws
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Indrajit was captured in May, days after police arrested two other militants on their way to the embassy in downtown Jakarta and seized five homemade bombs from a backpack they were carrying. Other explosive materials were found later at their rented house in southern Jakarta. Two others were arrested months later.
The foiled attack was planned for a few days after the country's most prominent extremist leader, Abu Bakar Bashir, made a call from prison for jihad and urged Indonesian Muslims to go to Myanmar to fight. Bashir was the leader of the Jemaah Islamiyah militant network, some of whose members carried out the attacks in the 2000s, including the 202 Bali nightclub bombings.