[jira] [Created] (GROOVY-11490) ClassCastException when assigning a lambda returning null into a SAM expecting a primitive

[Thodoris Sotiropoulos (Jira)]

Thodoris Sotiropoulos created GROOVY-11490:
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             Summary: ClassCastException when assigning a lambda returning null 
into a SAM expecting a primitive
                 Key: GROOVY-11490
                 URL: https://issues.apache.org/jira/browse/GROOVY-11490
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
            Reporter: Thodoris Sotiropoulos


I have the following program
{code:java}
import java.util.function.IntSupplier;

public class Test {
  public static void main(String[] args) {
    IntSupplier x = () -> null;
    int y = x.getAsInt();
  }
} {code}
h3. Actual behavior

The code compiles but there's CCE at runtime
{code:java}
Exception in thread "main" 
org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast 
'null' to class 'int'. Try 'java.lang.Integer' instead
        at 
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToNumber(DefaultTypeTransformation.java:177)
        at 
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.intUnbox(DefaultTypeTransformation.java:85)
        at Test$_main_lambda1.doCall(test.groovy:5)
        at Test.main(test.groovy:6) {code}
h3. Expected behavior

The code should have been rejected.



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