Re: jmx-dev [Fwd: Fix compiler problem]

[Eamonn McManus]

Thanks for bringing this to our attention, Alan. Roman is right - the code in question should not compile and we should change it as he suggests so that it is correct. (For people interested in the gory details, the method <T extends Annotation> T getAnnotation(Class<T> annotationClass) returns T only if it is called on a properly generic variable, such as a Constructor<?> or Constructor<? extends Foo> or Constructor<E>. If it is called on a plain Constructor with no type parameter, then that is a "raw type", and the return type is "erased" to Annotation. So something like ConstructorProperties annotation = constructor.getAnnotation(ConstructorProperties.class) should not compile if constructor is declared as Constructor rather than Constructor<?> or whatever.) Éamonn McManus JMX Spec Lead http://weblogs.java.net/blog/emcmanus/ Alan Bateman wrote: I don't know if the JMX  team or the JavaBeans maintainers are on the core-libs-dev mailing list. Subject: Fix compiler problem From: Roman Kennke <[EMAIL PROTECTED]> Date: Tue, 18 Dec 2007 15:32:06 +0100 To: Core-Libs-Dev <[EMAIL PROTECTED]> To: Core-Libs-Dev <[EMAIL PROTECTED]> When trying to compile OpenJDK with the Eclipse compiler, I noticed two compiler errors related to generics. It turned out that the code there is invalid and only javac (incorrectly) accepts it. See the following bug reports for details: https://bugs.eclipse.org/bugs/show_bug.cgi?id=212147 http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6400189 The attached changeset fixes the problem. Could this be included? /Roman