java - MapStruct : Getting error of implementation is not abstract and does not override abstract method -

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i new mapstruct , doing poc. can see mapstruct able generate implementation class interface general method 

set<string> integersettostringset(set<integer> integers);

but when use project specific classes gives me compilation error of <interfacename>impl not abstract , not override abstract method <custommethod>.

i using interface 1 method. interface annotated @mapper method simple one-to-one mapping no need of @mapping annotation.

as mentioned earlier, if put general method works fine not project specific classes.

can give me pointers on issue?


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