Bugzilla – Full Text Bug Listing
| Summary: | [1.5][compiler] type mismatch with Collections.emptyList and wildcard | ||
|---|---|---|---|
| Product: | [Eclipse Project] JDT | Reporter: | Andrew Bachmann <AndrewBachmann> |
| Component: | Core | Assignee: | Philipe Mulet <philippe_mulet> |
| Status: | VERIFIED DUPLICATE | QA Contact: | |
| Severity: | normal | ||
| Priority: | P3 | ||
| Version: | 3.2 | ||
| Target Milestone: | 3.1.2 | ||
| Hardware: | PC | ||
| OS: | Windows XP | ||
| Whiteboard: | |||
A workaround that doesn't involve suppressing warnings is to explicitly supply the extended type: public List<? extends Interface> field = Collections.<Interface>emptyList(); A patch for 3.1.1 is available, see some comment in bug 112268. Added regression test: GenericTypeTest#test866 *** This bug has been marked as a duplicate of 112268 *** Verified in M20060109-0800 for 3.1.2 |
The following code generates an error in eclipse 3.1.1 and 3.1m2, but it compiles fine in both eclipse 3.1 and javac version 1.5.0_05. It doesn't matter if the "Interface" class below is defined as a class or as an interface, it generates the error in both cases. The error is: "Type mismatch: cannot convert from List<Object> to List<? extends Test.Interface>" import java.util.Collections; import java.util.List; public class Test { public interface Interface { // nothing } public List<? extends Interface> field = Collections.emptyList(); }