472307 – filter(Objects::nonNull) changes Stream type to <Object> fails cast

Some Eclipse Foundation services are deprecated, or will be soon. Please ensure you've read this important communication.

Bug 472307 - filter(Objects::nonNull) changes Stream type to <Object> fails cast

Summary: filter(Objects::nonNull) changes Stream type to <Object> fails cast

Status:	VERIFIED DUPLICATE of bug 463728

Alias:	None

Product:	JDT
Classification:	Eclipse Project
Component:	Core (show other bugs)
Version:	4.5
Hardware:	PC Mac OS X

Importance:	P3 normal (vote)
Target Milestone:	4.6 M1
Assignee:	Stephan Herrmann
QA Contact:

URL:
Whiteboard:
Keywords:

Depends on:
Blocks:

Reported:	2015-07-09 13:55 EDT by Jared Stehler
Modified:	2015-08-04 06:15 EDT (History)
CC List:	2 users (show)

See Also:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.

Description Jared Stehler

2015-07-09 13:55:03 EDT

Only seems to happen when I use braces in the .map lambda:

  public Stream<String> getStream(List<String> list) {
    return list.stream()
        .map(s1 -> {
          return s1.length() > 3 ? s1 : null; 
        })
        .filter(Objects::nonNull);
  }

Description	Resource	Path	Location	Type
Type mismatch: cannot convert from Stream<Object> to Stream<String>	BrokenStreamFilter.java	/sandbox/src/main/java/sandbox	line 19	Java Problem

Comment 1 Timo Kinnunen

2015-07-09 18:24:59 EDT

Bug 469753 is also one where lambda block vs lambda expression makes a difference for inference results.

Comment 2 Stephan Herrmann

2015-07-12 12:19:27 EDT

I can reproduce in 4.5.

This has already been fixed via bug 463728 (4.6 M1).

*** This bug has been marked as a duplicate of bug 463728 ***

Comment 3 Manoj N Palat

2015-08-04 06:15:13 EDT

Verified for Eclipse Neon 4.6 M1 Build id: I20150803-2000