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Java Forum / General / November 2005Old code, collections and generics warning
Hi, I have some old java code that use the collection classes. Now compiling with 1.5 I get warnings like warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.List My question is: Is there a way to avoid these warnings? Is there a way to use 1.5 collection classes "the old way" that is without caring about generics? I like the 1.4 style of coding with collections. I do not like generics and do not want to use them at all but is this possible with 1.5 collections? I know I can just ignore the warnings but I am generally not interested in ignoring warnings - I just do not see these warnings as meaningfull. If it worked ok on 1.4 it will still work on 1.5 right? - Nicolai On Tue, 08 Nov 2005 14:21:22 +0100, Nicolai Henriksen <nicolai@drengene.dk> wrote, quoted or indirectly quoted someone who said : >My question is: Is there a way to avoid these warnings? Is there a way >to use 1.5 collection classes "the old way" that is without caring about >generics? Yes. But you have to ignore the warnings.  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. :-( It messes up our nightly build so I cannot live with the warnings. Is there any way to suppress this exact warning without supress all warnings? - Nicolai > On Tue, 08 Nov 2005 14:21:22 +0100, Nicolai Henriksen > <nicolai@drengene.dk> wrote, quoted or indirectly quoted someone who [quoted text clipped - 5 lines] > > Yes. But you have to ignore the warnings. On Tue, 08 Nov 2005 14:33:05 +0100, Nicolai Henriksen <nicolai@drengene.dk> wrote, quoted or indirectly quoted someone who said : >Is there any way to suppress this exact warning without supress all >warnings? It's coming. SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > On Tue, 08 Nov 2005 14:33:05 +0100, Nicolai Henriksen > <nicolai@drengene.dk> wrote, quoted or indirectly quoted someone who [quoted text clipped - 4 lines] > > It's coming. What Roedy is referring to is the @SuppressWarning annotation which Sun has defined, but hasn't implemented in their javac compiler yet. If your build system is aware of this annotation, then you can use it right away (Eclipse, for example, is aware of this annotation). If your build system uses Sun's JavaC compiler, then you'll have to wait for Sun to implement it. - Oliver Hm no luck for me then. We are using ant and even with -Xlint:-unchecked ant marks it as an error in the html output - not even as an warning. It is hard for me to believe (although I am beginning to) that sun has removed this excellent feature from java (the ability to do collections in a weakly typed way). Sigh. - Nicolai >>On Tue, 08 Nov 2005 14:33:05 +0100, Nicolai Henriksen >><nicolai@drengene.dk> wrote, quoted or indirectly quoted someone who [quoted text clipped - 13 lines] > > - Oliver > Hm no luck for me then. We are using ant and even with -Xlint:-unchecked > ant marks it as an error in the html output - not even as an warning. > > It is hard for me to believe (although I am beginning to) that sun has > removed this excellent feature from java (the ability to do collections > in a weakly typed way). Sigh. Try Collection c = new Vector<Object>(); or something like that. AFAIK, you can create a Vector of Strings, or Vector of Integers, with Generics. So you can definitely create a Vector of Objects. And continue with it the old way. Am I right. See if that works, its some kind of a bad workaround though. I dont know if it is a good thing to do. I am not sure about syntax. I have never used jdk 1.5 ( and I dont intend to, unless the bosses decide to shift to 1.5 ). Oh yes. That might let me continue the coding style although still polluting the code a little. But definitely worth a try. Thanks. - Nicolai > Try Collection c = new Vector<Object>(); or something like that. > AFAIK, you can create a Vector of Strings, or Vector of Integers, with [quoted text clipped - 5 lines] > I am not sure about syntax. I have never used jdk 1.5 ( and I dont > intend to, unless the bosses decide to shift to 1.5 ). > Hm no luck for me then. We are using ant and even with -Xlint:-unchecked > ant marks it as an error in the html output - not even as an warning. > > It is hard for me to believe (although I am beginning to) that sun has > removed this excellent feature from java (the ability to do collections in > a weakly typed way). Sigh. I wouldn't say they removed this "feature"; rather, they're just discouraging it (which is why it's reported as a warning and not an error). - Oliver > Hm no luck for me then. We are using ant and even with > -Xlint:-unchecked ant marks it as an error in the html output - not [quoted text clipped - 3 lines] > has removed this excellent feature from java (the ability to do > collections in a weakly typed way). Sigh. It sounds more like you have a project policy or build system that disallows warnings, and *that* is the problem? Signaturemonique Ask smart questions, get good answers: http://www.catb.org/~esr/faqs/smart-questions.html He he. Well I do not mind the warnings that much. The thing is that ant flags them as errors making it impossible to see with a quick glance whether the nightly build failed or not. - Nicolai > It sounds more like you have a project policy or build system that > disallows warnings, and *that* is the problem? > He he. Well I do not mind the warnings that much. The thing is that ant > flags them as errors making it impossible to see with a quick glance > whether the nightly build failed or not. So use a better tool than Ant? I haven't used Ant myself, but I hear it's a good product. Are you sure there aren't some sort of configuration setting or something that you can't edit so that Ant treats warnings as warnings instead of as errors? - Oliver He he. Well otherwise we are very satisfied with Ant. It even does our C++ build very efficiently and on multiple platforms one of which is embedded cross-compile - all with exactly one build system across. But even so. They actually have a bug in their bug-tracking system stating this exact problem. Due to the very general nature of the way ant handles "tools" everything on stderr is treated as an error as far as I know. But I think we will go for some king of post-processing of the output - we are running the output through XSLT anyway so it might be safe to filter out the "Note:" lines. So configuration? Well yes. Just configuration of the kind have a .java or .xsl extension :-) - Nicolai > So use a better tool than Ant? > [quoted text clipped - 3 lines] > > - Oliver "Nicolai Henriksen" wrote... > I have some old java code that use the collection classes. > Now compiling with 1.5 I get warnings like [quoted text clipped - 5 lines] > Is there a way to use 1.5 collection classes "the old way" > that is without caring about generics? If you don't use anything else of the features in 1.5 either (e.g. foreach-loops, etc), you can suppress the warnings with the compiler switch -source 1.4 But then you'll probably walk into troble somewhere in the future where some developer begins to use 1.5 features. There's also the possibility to use the switch -Xlint:-unchecked The latter suppresses the specific warnings but you'll still get a message... Note: C:\X\Y.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. // Bjorn A Nicolai Henriksen coughed up: > Hi, > [quoted text clipped - 11 lines] > and do not want to use them at all but is this possible with 1.5 > collections? If this is an issue of /comfort/ then I don't believe anyone without similar prior experience is comfortable reading through generics laden source. You are most likely going to be faced with large amounts of it sooner or later. Bite the bullet now. > I know I can just ignore the warnings but I am generally not interested > in ignoring warnings - I just do not see these warnings as meaningfull. > If it worked ok on 1.4 it will still work on 1.5 right? > > - Nicolai SignatureDoesn't /anyone/ know where I can find a credit card company that emails me the minute something is charged to my account? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. 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