Please, could someone help me to figure out why the following code compiles with jdk8u45 and above but fails with jdk8u25? I looked through the JDK release notes but didn't find anything related to the issue or maybe missed it.
The code
public class Main {
static class Param {
final int id;
Param(int id) {
this.id = id;
}
}
static class Subtask {
final Param param;
Subtask(Param param) {
this.param = param;
}
}
public static void main(String[] args) {
List<? extends Param> params = IntStream.range(1, 100).mapToObj(Param::new).collect(Collectors.toList());
NavigableMap<String, Subtask> map = params.stream()
.collect(Collectors.toMap(p -> UUID.randomUUID().toString(), Subtask::new, (a, b) -> a, TreeMap::new));
}
}
jdk8u25 exception:
Error:(33, 17) java: no suitable method found for collect(java.util.stream.Collector<org.ka.Main.Param,capture#1 of ?,java.util.TreeMap<java.lang.String,org.ka.Main.Subtask>>)
method java.util.stream.Stream.<R>collect(java.util.function.Supplier<R>,java.util.function.BiConsumer<R,? super capture#2 of ? extends org.ka.Main.Param>,java.util.function.BiConsumer<R,R>) is not applicable
(cannot infer type-variable(s) R
(actual and formal argument lists differ in length))
method java.util.stream.Stream.<R,A>collect(java.util.stream.Collector<? super capture#2 of ? extends org.ka.Main.Param,A,R>) is not applicable
(cannot infer type-variable(s) R,A,capture#3 of ?,T,K,U,M,K,V
(argument mismatch; java.util.stream.Collector<capture#2 of ? extends org.ka.Main.Param,capture#4 of ?,java.util.TreeMap<java.lang.Object,org.ka.Main.Subtask>> cannot be converted to java.util.stream.Collector<? super capture#2 of ? extends org.ka.Main.Param,capture#4 of ?,java.util.TreeMap<java.lang.Object,org.ka.Main.Subtask>>))
