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https://issues.apache.org/jira/browse/GROOVY-8638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles updated GROOVY-8638:
--------------------------------
Fix Version/s: 2.5.16
> CompileStatic fails with Guava Multimap#asMap
> ---------------------------------------------
>
> Key: GROOVY-8638
> URL: https://issues.apache.org/jira/browse/GROOVY-8638
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.5.0, 3.0.5
> Reporter: Dan Ziemba
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.0-beta-1, 3.0.9, 2.5.16
>
>
> When using CompileStatic and groovy 2.5.0, type checking appears wrong with
> [Guava's Multimap.asMap
> |https://google.github.io/guava/releases/25.1-jre/api/docs/com/google/common/collect/ListMultimap.html#asMap--]
> method. Return type from that method is Map<K, Collection<V>>, but
> attempting to assign to a variable of that type results in the error message:
> {noformat}
> Incompatible generic argument types. Cannot assign java.util.Map <K, V> to:
> java.util.Map <K, Collection>
> {noformat}
> This previously worked fine with Groovy 2.4.15. Adding an explicit cast to
> the asMap() call appears to work around the error.
> Here is a small script demonstrating the problem:
> {code:java}
> @Grab('com.google.guava:guava:25.1-jre')
> import com.google.common.collect.ArrayListMultimap
> import com.google.common.collect.ListMultimap
> import groovy.transform.CompileStatic
> @CompileStatic
> class Test {
> void test() {
> ListMultimap<String, Integer> mmap = ArrayListMultimap.create()
> // This extra cast fixes all the errors...
> //ListMultimap<String, Integer> mmap = ArrayListMultimap.create() as
> ListMultimap<String, Integer>
> Map<String, Collection<Integer>> map = mmap.asMap()
>
> Set<Map.Entry<String, Collection<Integer>>> entrySet = map.entrySet()
> Iterator<Map.Entry<String, Collection<Integer>>> iter =
> entrySet.iterator()
>
> while (iter.hasNext()) {
> Map.Entry<String, Collection<Integer>> group = iter.next()
> Collection<Integer> values = group.value
> }
> }
>
> static void main(String... args) {
> Test test = new Test()
> test.test()
> }
>
> }
> {code}
> And the full error output:
> {noformat}
> 5 compilation errors:
> [Static type checking] - Incompatible generic argument types. Cannot assign
> java.util.Map <java.lang.String, java.lang.Integer> to: java.util.Map
> <String, Collection>
> at line: 14, column: 48
> [Static type checking] - Incompatible generic argument types. Cannot assign
> java.util.Set <java.util.Map$Entry> to: java.util.Set <Map.Entry>
> at line: 16, column: 64
> [Static type checking] - Incompatible generic argument types. Cannot assign
> java.util.Iterator <java.util.Map$Entry> to: java.util.Iterator <Map.Entry>
> at line: 17, column: 65
> [Static type checking] - Incompatible generic argument types. Cannot assign
> java.util.Map$Entry <java.lang.String, java.lang.Integer> to:
> java.util.Map$Entry <String, Collection>
> at line: 20, column: 60
> [Static type checking] - Cannot assign value of type java.lang.Integer to
> variable of type java.util.Collection <Integer>
> at line: 21, column: 42
> {noformat}
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