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I just moved up to 3.1RC2 from 3.1M6 and some of my 1.5 code no longer compiles. Here is a simple test case to demonstrate the problem. It compiles without error under 3.1M6, but fails with an obscure error under 3.1RC2: -------------------------------- import java.util.ArrayList; import java.util.List; public class Test1 { static <T> List<T> foo() { return new ArrayList<T>(); } public static void main(String[] args) { for (String s: (List<String>)foo()) {} } }
M6 was too permissive. We now flag an error, and javac agrees with us. Our compiler was incorrectly using type expectation from cast to drive inference, which is against the spec. So really, if the spec was changing we would revert to old behavior. Write instead: import java.util.ArrayList; import java.util.List; public class Test1 { static <T> List<T> foo() { return new ArrayList<T>(); } public static void main(String[] args) { List<String> foo = foo(); for (String s: foo) {} } }
*** Bug 100879 has been marked as a duplicate of this bug. ***
