Eyso Zanstra created NETBEANS-789:
-------------------------------------
Summary: Omitting a generic type has a cascading effect;
Key: NETBEANS-789
URL: https://issues.apache.org/jira/browse/NETBEANS-789
Project: NetBeans
Issue Type: Bug
Affects Versions: 8.2
Environment: Windows 8.1 64 bit
Processor Intel i7-4720HQ @2.60Ghz
16GB RAM
Reporter: Eyso Zanstra
Example code:
{code:java}
package util;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.Optional;
/**
*
* @author eyso
* @param <T> example generic
*/
public class Foo<T> {
private final T val;
private Optional<Long> timestamp = Optional.<Long>empty();
public Foo(T val) {
this.val = val;
timestamp = Optional.of(System.currentTimeMillis());
}
public Optional<Long> getTimestamp() {
return timestamp;
}
public static Set<Long> getTimestamps(Collection<Foo> foos) {
Set<Long> result = new HashSet<Long>();
for (Foo foo : foos) {
if (foo.getTimestamp().isPresent()) {
result.add(foo.getTimestamp().get()); //Argument mismatch;
}
}
return result;
}
}
{code}
This raises an error: Argument mismatch; Object cannot be converted to Long
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