mockito: How to match varargs in java 8? -


i'm working on migrating project java 7 8, , have gotten compilation error in mockito "when" case i'm having hard time tracking down:

when(queryrunner.query(any(string.class), any(resultsethandler.class), anyvararg())).thenreturn(mockedwordresultlist);

gives me compilation error of:

java: reference query ambiguous   both method <t>query(java.lang.string,java.lang.object,org.apache.commons.dbutils.resultsethandler<t>) in org.apache.commons.dbutils.queryrunner , method <t>query(java.lang.string,org.apache.commons.dbutils.resultsethandler<t>,java.lang.object...) in org.apache.commons.dbutils.queryrunner match

this error happens in build 1.8.0-b128, doesn't happen in 1.7.0_45. i'm using mockito 1.9.5.

what's correct way use anyvararg() argument matching in java 8?

the problem type inference has been improved. anyvararg() generic method using in nested method invocation. before java 8 limitations of type inference forced treating method <t> t anyvararg() <object> object anyvararg() when placed argument method invocation without inserting explicit type arguments.

so query(string, resultsethandler, object...) matched third argument treated being of type object.

but java 8 type inference works nested method calls. since <t> t anyvararg() type parameter <t> can anything, can resultsethandler well. query(string,object,resultsethandler) match candidate now.

(i omitted type parameter <t> outer call in both cases make less confusing)

since have 2 possible matches now, normal procedure of method selection applies here. , yes, it’s ambiguous. first parameter same, string, other 2 resultsethandler more specific object while 1 candidate accepts more specific type second parameter, other third (and follow-ups).

it’s clear type parameters allow method’s return type source of ambiguity apis mockito’s containing such methods corner case of java programming. have force type either generic way matchers.<desired>anyvararg() or via type cast (desired)anyvararg().


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