java - Dozer problems with maps generic types and proxies -

in our company have discovered dozer has problems copying fields hibernate entity simple dto (a simple pojo) fields, maps of other entities. how looks:

class myjpaentity{      @jpamappings(fetchtype.eager)      map<integer, embeddablejpaentity> map; }  class mydto{     map<integer, myotherdto> map; } 

soo, dozer, when trying copy fields entity dto tries somehow copy proxy not contents, raising lazyinitializationexception (even though fetch type eager). figured out, can create wrapper, , custom converter deals situation:

public class maybepersistentmaptohashmapconverter extends     dozerconverter<map, map> implements mapperaware {      public static class wrapper {         private map map;          public wrapper() {         }          public wrapper(map map) {             this.map = map;         }          public map getmap() {             return map;         }          public void setmap(map map) {             this.map = map;         }     }      private mapper mapper;      public maybepersistentmaptohashmapconverter() {         super(map.class, map.class);     }      @override     public void setmapper(mapper mapper) {         this.mapper = mapper;     }      @override     public map convertto(map source, map destination) {         return map(source, destination);     }      @override     public map convertfrom(map source, map destination) {         return map(source, destination);     }      private map map(map source, map destination) {         wrapper wrapper;          if (source instanceof persistentmap) {             wrapper = new wrapper(new hashmap<>(source));         } else {             wrapper = new wrapper(source);         }          if (destination == null) {             wrapper map = mapper.map(wrapper, wrapper.class);             return map.map;         } else {             throw new unsupportedoperationexception();         }     } } 

so stuff, wraps map dozer not copy proxymap. configure mapping in code:

mapping(fromtype, totype, oneway())             .fields("map", "map",  fieldsmappingoptions.customconverter(maybepersistentmaptohashmapconverter.class) 

so far good. so problem? problem other way mapping - dto entity. instead of copying mydto myjpaentity entries entity (with mapping inner dto inner entity, copies myjpaentity map entries - cannot guess target type, , instead of mapping objects, copies them.

so able solve problem well, specifying hint map types:

fields("map", "map", fieldsmappingoptions.hinta(myotherdto.class), fieldsmappingoptions.hintb(embeddablejpaentity.class) ) 

i helped people allready ;) , happy solved problems.

until had copy values entity entity using doser. now, if use hints, lazyinitexception, if use wrapping converter above hints ignored mapper. , sourceforge docs dozer inaccessible right now. have idea how use mapper , force use hints? or how configure mappings builder?

i used mapper in maybepersistentmaptohashmapconverter not aware should use hints, unaware mapping field of name "map"

in our project solved problem , stuck badly in problem solved 1 ;).

your lazyinitializationexception maybe calling .class in map method dozer. that's because dozer instantiate new entity , fill , entity not in current session. change our dozer map method calling from:

a_entity newentity = dozer.map(dto,a_entity.class); 

to:

a_entity newentity = new a_entity(); dozer.map(a_dto,newentity); 

and in other way:

a_dto dto = dozer.map(entity,a_dto.class); 

to:

a_dto dto = spring.context.getbean("a_dto"); dozer.map(entity,dto); 

i hope usefull.