consuming a non standard promise in java

hi...i'm  consuming cockpit api promises, but it would seem they are using a non standard form which i cannot use with elemental2 

https://github.com/cockpit-project/cockpit/issues/14682

their fail method returns multiple paramters, which elemental2 doesn't have. 

so they recommended using done method (which elemental2 also doesn't have) 

cockpit.spawn(["/opt/aeroscout/engine/run/aeroscout-engine-wd","status"]) .done(data=>console.log("data " + data)) .fail((ex,data) => { console.log(ex); })  

are there any other java gwt Promise libraries i can use?

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