[jira] [Created] (GROOVY-10720) Resolving wrong overloaded method?

[Thodoris Sotiropoulos (Jira)]

Thodoris Sotiropoulos created GROOVY-10720:
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             Summary: Resolving wrong overloaded method?
                 Key: GROOVY-10720
                 URL: https://issues.apache.org/jira/browse/GROOVY-10720
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
            Reporter: Thodoris Sotiropoulos


I have the following program

{code}
import java.util.Arrays;

class Test {
    void test() {
      Double[] x = null;
      var y = Arrays.stream(x).map(d -> "fda").findFirst();
    }
}
{code}

h3. Actual behavior

{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 7: [Static type checking] - Cannot return value of type 
java.lang.String for lambda expecting double
 @ line 7, column 41.
   y = Arrays.stream(x).map(d -> "fda").fin
                                 ^

1 error
{code}

h3. Expected behavior

Compile successfully

This issue stems from the fact that there are two relevant overloaded 
`stream()` methods in the class `java.utils.Arrays`. See the corresponding 
signatures below:

* static DoubleStream stream​(double[] array)
* static <T> Stream<T> stream​(T[] array)

So the compiler chooses to call the first method, because it thinks that the 
first method is more specific than the second one. I don't know if this is a 
bug or a feature. FYI, javac resolves the second method.



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