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Java Forum / General / November 2006Non-final class at compile-time, final at runtime
Can somebody tell me under which conditions a non-final class (compile-time) can become final in runtime? Thanks Hi, as far as I know the answer is: under no conditions. You need to declare it final at compile time. Best regards, Jan > Can somebody tell me under which conditions a non-final class > (compile-time) can become final in runtime? > Thanks  Signature__________________________________________________________ insOMnia - We never sleep... http://www.insomnia-hq.de > Can somebody tell me under which conditions a non-final class > (compile-time) can become final in runtime? Perhaps you could do some magic with a custom class loader and/or reflection. - Oliver >> Can somebody tell me under which conditions a non-final class >> (compile-time) can become final in runtime? > > Perhaps you could do some magic with a custom class loader and/or > reflection. Custom class loader: Well you could load different bytes, but then that would be a different class. Reflection: I think setAccessible is the only point of mutation, and that only affects the reflection object, not the reflectee. I guess the instrumentation API might work. Or a debugging interface. Tom Hawtin > Can somebody tell me under which conditions a non-final class > (compile-time) can become final in runtime? > Thanks It's a multistep process: 1. Compile all sources; 2. Copy all resulting .class files; 3. Modify the source of the code such that a non-final class is now final; 4. Recompile; 5. Replace the old .class file for the modified class with the new .class file. I assume that you're referring to some of the oddities in the spec... this is the kind of situation that those oddities are intended to address. -- Adam Maass > Can somebody tell me under which conditions a non-final class > (compile-time) can become final in runtime? It would be interesting to hear how you come to be in this situation, and how you can tell it's happening. E.g. are you using reflection to discover what the attributes of the class are, or are you getting runtime errors when you try to load a sub-class of a supposedly non-final class, or what ? Or is it, perhaps, something that you are trying to /achieve/ ? (But why ??) -- chris Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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