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Build Identifier: 20100218-1602 The following code compiles using Eclipse 3.5.2 but fails with Javac 1.6.20: public interface SomeInterface { public Vector<String> getStuff(); } public class BaseClass implements SomeInterface { @Override public Vector getStuff() { return new Vector(); } } public class SubClass extends BaseClass { @Override public Vector<? extends String> getStuff() { return super.getStuff(); } } Reproducible: Always Steps to Reproduce: 1. Open attached project in Eclipse , compiles (with warnings) 2. Try to compile the same classes using javac 1.6.20 on the command-line => failure
Created attachment 167732 [details] Demonstrates the bug
Sorry, forgot the javac output: > javac -d target src/*.java src/SubClass.java:6: getStuff() in SubClass cannot implement getStuff() in SomeInterface; attempting to use incompatible return type found : java.util.Vector<? extends java.lang.String> required: java.util.Vector<java.lang.String> public Vector<? extends String> getStuff() { ^ Note: Some input files use unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 1 error
Using HEAD contents in 1.6 mode I get: [compiled 24 lines in 562 ms: 42.7 lines/s] [2 .class files generated] ---------- 1. ERROR in D:\tests_sources\SubClass.java (at line 6) public Vector<? extends String> getStuff() { ^^^^^^^^^^^^^^^^^^^^^^^^ The return type is incompatible with SomeInterface.getStuff() ---------- 1 problem (1 error) which seems to be consistent with javac. Srikanth, could you please double-check this case? Thanks. Tobias, please use a newer version of the compiler.
> Tobias, please use a newer version of the compiler. Since I'm already using the latest Eclipse version, do you want me to try the compiler from HEAD ? Is there an update site where I can get the binaries or do I need to compile it myself ?
Using 3.6M7 should be good enough.
Stupid me, didn't think of the milestone releases :) The code does not compile with Eclipse 3.6M7 and the error message is correct. Thanks for your quick response !
While this is not a duplicate of bug# 302358 the fix for that bug also addresses this issue and hence the behavior 3.6 M6+ is correct and matches javac.
Verified for 3.6RC1 using build I20100513-1500.
