java - Unable to get a generic ResponseEntity where T is a generic class "SomeClass" -

java - Unable to get a generic ResponseEntity<T> where T is a generic class "SomeClass<SomeGenericType>" -

please help me responseentity<t> t generic type. see of now, not supported nowdays spring resttemplate. i'm using spring mvc version 3.1.2

here code, want use: code:

responseentity<cisresponse<cisresponseentity>> res = this.resttemplate.postforentity( this.rooturl, myrequestobj, cisresponse.class);

i'm getting error:

type mismatch: cannot convert responseentity<cisresponse> responseentity<cisresponse<cisresponseentity>>

it's obvious error, how can workaround today?

than want generic response type:

cisresponse<cisresponseentity> myresponse= res.getbody(); cisresponseentity entity = myresponse.getentityfromresponse();

for now, utilize solution, postforobject() , not postforentity():

cisresponse<cisresponseentity> response = this.resttemplate.postforobject( this.rooturl,myrequestobj, cisresponse.class);

this a known issue. it's fixed introduction of parameterizedtypereference, parameterized type explicitely inherit supply type info @ runtime. called super-type token, , works around type erasure because subclasses (anoniymous in case) maintain type arguments of generic supertype @ runtime.

however can't utilize postforobject, because api supports exchange():

responseentity<cisresponse<cisresponseentity>> res = template.exchange( rooturl, httpmethod.post, null, new parameterizedtypereference<cisresponse<cisresponseentity>>() {});

note lastly line demonstrates thought of super type tokens: don't supply literal cisresponse.class, anonymous instantiation of parameterized type parameterizedtypereference<t>, @ runtime can expected extract subtype information. can think of super type tokens hacks achieving foo<bar<baz>>.class

btw, in java don't need prefix access instance variable this: if object defines url , template members, access them simple name, , not prefixing this.url , this.template

java spring rest generics spring-mvc