The company, G&D Integrated, had closed the factory, saying it had suddenly lost its decade-old contract with a Japanese company, workers said.
Starbucks closed multiple stores this year following union activity.
Trader Joe’s, for example, abruptly closed a wine shop in the center of New York City where workers had been organizing.
Demonstrators protest outside a closed Starbucks in Seattle on July 16.
More than 40 percent of the stores had union campaigns, according to data from Starbucks Workers United, the union that has been organizing the workers.