java - cups4j : how to print with monochrome attribute -

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i want print document using cups4j monochrome attribute. can't find job-attributes option.

could me please ?

the part of code related attribute is: 

hashmap<string, string> attributemap = new hashmap<string, string>(); attributemap.put("job-attributes", "print-color-mode-supported:keyword:monochrome"); printjob printjob = new printjob.builder(fileinputstream).jobname("testjobname").username("admin").copie‌​s(copies).pageranges(pages).duplex(duplex).attributes(attributemap).build(); printrequestresult printrequestresult = printer.print(printjob);


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