Christopher Smith created GROOVY-11051:
------------------------------------------
Summary: Static compiler does not coerce Groovy truth from closures
Key: GROOVY-11051
URL: https://issues.apache.org/jira/browse/GROOVY-11051
Project: Groovy
Issue Type: Bug
Components: Static compilation
Affects Versions: 4.0.12
Reporter: Christopher Smith
The static compiler will accept a closure returning a non-boolean value as
fulfilling a {{Predicate}}, but it does not coerce the return value using
Groovy truth.
{code}
@CompileStatic
class Bug {
static void main(String[] args) {
println new AtomicReference<Object>(null).stream()
.filter( { it.get() } as Predicate<AtomicReference<?>>)
// or .filter(AtomicReference::get as Predicate<AtomicReference<?>>)
.findAny()
}
}
{code}
Expected result: {{Optional.empty}}
Actual result: NullPointerException on unboxing the {{null}} return value
Using an explicit {{as boolean}} inside the lambda works, but this doesn't work
with method references. Coercion should work even without {{as Predicate}} if
the compiler sees the functional return type is boolean/Boolean.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
