Christopher Smith created GROOVY-10064:
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Summary: STC infers incorrect type for closure parameter
Key: GROOVY-10064
URL: https://issues.apache.org/jira/browse/GROOVY-10064
Project: Groovy
Issue Type: Bug
Components: Static Type Checker
Affects Versions: 3.0.8
Reporter: Christopher Smith
I have this subroutine in some code managing DynamoDB tables; the types are
from the Amazon 2 SDK and Vavr. The {{Either#fold}} method takes a {{Function<?
super L, ? extends U>}} and a {{Function<? super R, ? extends U>}} (collapsing
either a "left" or a "right" value into a single result). In this particular
case, both types are the same {{DynamoDbTable}}, just representing different
process states. The result type is a {{Try<DynamoDbTable>}}.
Aside from needing the workarounds that I think are related to GROOVY-10033
({{.&}} and {{as CheckedRunnable}}), this code _works as expected_ in
GRECLIPSE, but it fails when compiled with groovyc.
{code:groovy}
private Try<DynamoDbTable> waitForTableActive(Either<DynamoDbTable,
DynamoDbTable> maybeActive) {
maybeActive.fold(
Try.&success, // we already determined it's active
table -> {
log.debug('waiting for table {} to become active',
table.tableName())
Try.success(table)
.andThenTry({ poll.until { checkActive(table).isLeft() } }
as CheckedRunnable)
}
)
}
Either<DynamoDbTable, DynamoDbTable> checkActive(DynamoDbTable table) {}
{code}
{code}
Failed to execute goal org.codehaus.gmavenplus:gmavenplus-plugin:1.10.0:compile
(default) on project azimuth-server: Error occurred while calling a method on a
Groovy class from classpath.: InvocationTargetException: startup failed:
DynamoDbSchemaRegistryImpl.groovy: 134: [Static type checking] - Cannot find
matching method io.vavr.control.Try#tableName(). Please check if the declared
type is correct and if the method exists.
@ line 134, column 68.
r table {} to become active', table.tabl
^
DynamoDbSchemaRegistryImpl.groovy: 136: [Static type checking] - Cannot find
matching method
co.vendorflow.azimuth.server.infrastructure.data.dynamodb.DynamoDbSchemaRegistryImpl#checkActive(io.vavr.control.Try
<T>). Please check if the declared type is correct and if the method exists.
@ line 136, column 59.
Try({ poll.until { checkActive(table).is
^
DynamoDbSchemaRegistryImpl.groovy: 136: [Static type checking] - Cannot find
matching method java.lang.Object#isLeft(). Please check if the declared type is
correct and if the method exists.
@ line 136, column 48.
.andThenTry({ poll.until { checkActiv
^
DynamoDbSchemaRegistryImpl.groovy: 131: [Static type checking] - Cannot call
<U> io.vavr.control.Either <DynamoDbTable,
DynamoDbTable>#fold(java.util.function.Function <? super
software.amazon.awssdk.enhanced.dynamodb.DynamoDbTable, ? extends U>,
java.util.function.Function <? super
software.amazon.awssdk.enhanced.dynamodb.DynamoDbTable, ? extends U>) with
arguments [groovy.lang.Closure <io.vavr.control.Try>, groovy.lang.Closure]
@ line 131, column 9.
maybeActive.fold(
^
{code}
I have absolutely no idea how the STC gets the idea that the _parameter_ of the
outer closure should be a {{Try}} (the _result_ should be), and it seems
possible that the rest of the errors are a cascade from that initial mistake.
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