Re: [Resteasy-users] Why is GenericEntity an abstract class?
Got it. Thank you very much, Bill! -Ursprüngliche Nachricht- Von: Bill Burke [mailto:bbu...@redhat.com] Gesendet: Dienstag, 13. August 2013 17:07 An: resteasy-users@lists.sourceforge.net Betreff: Re: [Resteasy-users] Why is GenericEntity an abstract class? THe sole purpose of GenericEntity (and GenericType) is Java type erasure. Take this example: List list = ...; return Response.ok(list).build(); With this, Resteasy has no clue about the generic type of "list". All it knows is that it is a java.util.List. Java just doesn't let you derive the generic type at runtime. GenericEntity/Type is a hack. Generic type information of extended superclasses *IS* stored and remembered by the java runtime. So this anonymous class is using this trick to obtain generic type information. Follow now? On 8/13/2013 10:55 AM, Juergen Zimmermann wrote: > When I need an instance of GenericEntity I've to create an object of > an anonymous class derived from GenericEntity. Therefore, I'm > wondering why GenericEntity isn't a concrete class? Any hint is appreciated. > > Regards, > Juergen > > > -- > Get 100% visibility into Java/.NET code with AppDynamics > Lite! > It's a free troubleshooting tool designed for production. > Get down to code-level detail for bottlenecks, with <2% overhead. > Download for free and get started troubleshooting in minutes. > http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.c > lktrk ___ > Resteasy-users mailing list > Resteasy-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/resteasy-users > -- Bill Burke JBoss, a division of Red Hat http://bill.burkecentral.com -- Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk ___ Resteasy-users mailing list Resteasy-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/resteasy-users -- Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk ___ Resteasy-users mailing list Resteasy-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/resteasy-users
Re: [Resteasy-users] Why is GenericEntity an abstract class?
THe sole purpose of GenericEntity (and GenericType) is Java type erasure. Take this example: List list = ...; return Response.ok(list).build(); With this, Resteasy has no clue about the generic type of "list". All it knows is that it is a java.util.List. Java just doesn't let you derive the generic type at runtime. GenericEntity/Type is a hack. Generic type information of extended superclasses *IS* stored and remembered by the java runtime. So this anonymous class is using this trick to obtain generic type information. Follow now? On 8/13/2013 10:55 AM, Juergen Zimmermann wrote: > When I need an instance of GenericEntity I've to create an object of an > anonymous class derived from GenericEntity. Therefore, I'm wondering why > GenericEntity isn't a concrete class? Any hint is appreciated. > > Regards, > Juergen > > > -- > Get 100% visibility into Java/.NET code with AppDynamics Lite! > It's a free troubleshooting tool designed for production. > Get down to code-level detail for bottlenecks, with <2% overhead. > Download for free and get started troubleshooting in minutes. > http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk > ___ > Resteasy-users mailing list > Resteasy-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/resteasy-users > -- Bill Burke JBoss, a division of Red Hat http://bill.burkecentral.com -- Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk ___ Resteasy-users mailing list Resteasy-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/resteasy-users
[Resteasy-users] Why is GenericEntity an abstract class?
When I need an instance of GenericEntity I've to create an object of an anonymous class derived from GenericEntity. Therefore, I'm wondering why GenericEntity isn't a concrete class? Any hint is appreciated. Regards, Juergen -- Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk ___ Resteasy-users mailing list Resteasy-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/resteasy-users
