Comment 1 Jeff Johnston 2021-05-27 22:39:38 EDT

Fleshing out the example and moving to JDT Core after debugging on 4.20 M3:

When the last line has the method reference, line 845 of MessageSend.java (resolveType())

	if (!this.binding.isValidBinding()) {

notes that the binding is not valid as it is a ProblemMethodBinding with problem id 23.  This causes it to return back to: CompletionOnMemberAccess.resolveType() with null and this causes it to throw a CompletionNodeFound exception with no ASTNode and then the code at:

CompletionEngine: 2291 has no ASTNode and so does not call complete().

In the editor, the entire line up to the last . is highlighed in error.

When the last line below is changed to:

    return userIds.stream().map((id) -> findBrief(id)).

only the last . is marked in error and the line 845 of MessageSend.java passes as a valid binding so it resolves the type and CompletionEngine: 2291 will find an ASTNode in the CompletionNodeFound exception and calls complete() which finds the various Stream methods.

import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

class UserService {

    public static class UserBrief {
        private int a;
        
        public UserBrief(int a) {
            this.a = a;
        }
        
        public int getA() {
            return a;
        }
        
        public String toString() {
            return Integer.toString(a);
        }
    }
    public static UserBrief findBrief(long userId) {
        return new UserBrief((int)userId);
    }

    public static Map<Long, UserBrief> findBrief(Set<Long> userIds) {
    return userIds.stream().map(UserService::findBrief).
    }
}

Comment 2 Sarika Sinha 2021-06-04 08:29:20 EDT

I see that now if I add ";" to return userIds.stream().map(UserService::findBrief)
and then I see "." gives the completion proposals.


Where as in 4.14 completion proposal was returned without that.

Also, just for curiosity -
What was the final method -
public static Map<Long, UserBrief> findBrief(Set<Long> userIds) {
	return userIds.stream().map(UserService::findBrief).filter(...);
    }

I mean what was the completion to convert Stream<UserBrief> to Map<Long, UserBrief> ?

Comment 3 Eclipse Genie 2023-06-06 13:15:50 EDT

This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet.

If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant.

--
The automated Eclipse Genie.