Read annotation of generic class Java -

i had idea use dao class (dao.java):

class dao <model extends abstractmodel> {     public string geturl() {         return model.class.getannotation(mypath.class).url();     } } 

and model (account.java):

@mypath(url = "blabla") class account extends abstractmodel {     ... } 

but problem in case if run

@test public void testdaourl() {     dao<account> dao = new dao<account>();     dao.geturl(); } 

model.class seems abstractmodel , not account. is there work around mypath annotation dao (without giving instance of account.class)?

thanks in advance idea!

ps: mypath-annotation:

@retention(runtime) @target(type) @interface mypath {     public string url(); } 

yes, there solution, it's uglier passing class argument dao constructor , more prone error.

this trick known type token. i've seen used in deserialization libraries (like gson or jackson json).

class dao<model extends abstractmodel> {     private final class<?> typeargument;      public dao() {         type superclass = getclass().getgenericsuperclass();          parameterizedtype parameterized = (parameterizedtype) superclass;         // nested generic types, becomes little more complicated         typeargument = (class<?>) parameterized.getactualtypearguments()[0];     }      public string geturl() {         return typeargument.getannotation(mypath.class).url();     } } 

and used so

new dao<account>(){}.geturl() 

so, when creating dao instance, actually, instead, create dao subclass instance. way instance of parameterized subtype of dao, ie. like

class anonymousdao extends dao<account> {} 

and parameterized type can extracted , used.