Re: [json-lib-user] JSONObject.toBean() problem

[Andres A. <aal...@ya...>]

I have found the problem. This is a bug reported as http://sourceforge.net/=
tracker/index.php?func=3Ddetail&aid=3D1592799&group_id=3D171425&atid=3D8579=
28=0Aand has already been fixed on the current development version (0.9-dev=
).=0AWith the example as is, the List will be filled with DynaBeans, if you=
 want Person objects instead=0Athe following code will work:=0A=0A      Str=
ing json =3D "{'data':[{'name':'Wallace'},{'name':'Grommit'}]}";=0A      JS=
ONObject obj =3D new JSONObject( json );=0A      Map classMap =3D new HashM=
ap();=0A      classMap.put( "data", Person.class );=0A      MyBean bean =3D=
 (MyBean) JSONObject.toBean( obj, MyBean.class, classMap );=0A=0ACheers.=0A=
 =0A-------------------------------------------=0AIng. Andres Almiray Jaram=
illo=0Ahttp://jroller.com/page/aalmiray=0A--=0AWhat goes up, must come down=
. Ask any system administrator.=0AThere are 10 types of people in the world=
: Those who understand binary, and those who don't.=0ATo understand recursi=
on, we must first understand recursion.=0A=0A----- Original Message ----=0A=
From: =EA=B9=80=EC=9D=91=EC=88=98 <sc...@gm...>=0ATo: Andres Almiray =
<aal...@ya...>=0ASent: Thursday, November 23, 2006 10:30:36 PM=0ASubj=
ect: Re: [json-lib-user] JSONObject.toBean() problem=0A=0AThank you for rep=
ly~ :)=0A=0A=0A=0AI'm using 0.9 version, and JDK 1.5.=0A=0A=0A=0AHave you c=
hecked the JSONObject.java source code? =0A=0A=0A=0AJSONObject.java 376 lin=
e is=0A=0A> List list =3D JSONArray.toList( (JSONArray) value, beanClass, c=
lassMap );=0A=0AThe 'beanClass' parameter is from JSONObject.toBean(...), a=
nd it is 'MyBean.class'.=0A=0ABecause 'MyBean.class' doesn't have 'name' pr=
operty, the exception was occured.=0A=0A=0A=0ASo, I think that the line sho=
uld be like following,=0A=0A> List list =3D JSONArray.toList( (JSONArray) v=
alue, null, classMap );=0A=0AThen, the list will have JSONArray instances, =
and I will be able to convert it to Person obejct=0A=0Awith DynaBeanToBeanM=
orpher.=0A=0A=0A=0AI have another idea. How about processing List like Map?=
 =0A=0AI think that if the type of a property is Map, the actual class is s=
elected from 'classMap' parameter. (Is it right?)=0A=0ALike this, if the ty=
pe of a property is List, the class can be selected from extra parameter, '=
classList'. =0A=0AThe type of 'classList' may be java.lang.Map<String, Clas=
s>. =0A=0AThen I don't have to use DynaBeanToBeanMorpher directly.=0A=0A=0A=
=0AThanks for reading~ Good bye~=0A=0A=0A=0A2006/11/24, Andres Almiray <aal=
mi...@ya...>:=0AI'm sorry for the confusion, but the last email is not =
exactly true.=0AThe example describes the ability of JSON-lib to create Dyn=
aBeans inside a list=0A=0Abecause it doesn't have any clues of what type of=
 objetcs it must create; then=0Aproceeds to exemplify the use of the DynaBe=
anToBeanMorpher.=0A=0AI've tested the code you sent against release 0.9 and=
 it works without a problem,=0A=0Acan you tell me please which version are =
you using ? =0A =0A-------------------------------------------=0AIng. Andre=
s Almiray Jaramillo=0A=0Ahttp://jroller.com/page/aalmiray=0A--=0AWhat goes =
up, must come down. Ask any system administrator.=0AThere are 10 types of p=
eople in the world: Those who understand binary, and those who don't.=0ATo =
understand=0A recursion, we must first understand recursion.=0A=0A=0A----- =
Original Message ----=0AFrom: Andres Almiray <aal...@ya...>=0ATo: =EA=
=B9=80=EC=9D=91=EC=88=98 <=0A...@ro...>; jso...@li...urce=
forge.net=0ASent: Thursday, November 23, 2006 10:52:58 AM=0A=0ASubject: Re:=
 [json-lib-user] JSONObject.toBean() problem=0A=0AYou are correct, the docs=
 do not state that the toBean() method needs a =0A=0Ahint of what type of o=
bjects are inside the collection, the correct code is=0A=0AString json =3D =
"{'data':[{'name':'Wallace'},{'name':'Grommit'}]}";=0AJSONObject obj =3D ne=
w JSONObject(json);=0A=0AMap classMap =3D new HashMap();=0AclassMap.put( "d=
ata",=0A Person.class );=0AMyBean bean =3D (MyBean) JSONObject.toBean( obj,=
 MyBean.class, classMap );=0A=0AThank you for spotting this problem :)=0A =
=0A-------------------------------------------=0A=0AIng. Andres Almiray Jar=
amillo=0Ahttp://jroller.com/page/aalmiray=0A--=0A=0AWhat goes up, must come=
 down. Ask any system administrator.=0AThere are 10 types of people in the =
world: Those who understand binary, and those who don't.=0ATo understand re=
cursion, we must first understand recursion.=0A=0A=0A----- Original Message=
 ----=0AFrom: =EA=B9=80=EC=9D=91=EC=88=98 <ki...@ro...>=0ATo: =0Ajson=
-li...@li...=0ASent: Thursday, November 23, 2006 5:23:56=
 AM=0ASubject: [json-lib-user] JSONObject.toBean() problem=0A=0AHi all.=0A=
=0AI've run the code in the 'Getting Started'=0A document.=0A=0A-----------=
-------------------------------------------------=0Apublic static class MyB=
ean{=0Aprivate List data;=0A=0Apublic List getData() {=0Areturn data;=0A}=
=0A=0Apublic void setData(List data) {=0A=0Athis.data =3D data;=0A}=0A}=0A=
=0Apublic static class Person{=0Aprivate String name;=0A=0Apublic String ge=
tName() {=0Areturn=0A name;=0A}=0A=0Apublic void setName(String name) {=0At=
his.name =3D name;=0A}=0A}=0A=0Apublic static void testTest() throws Except=
ion=0A=0A{=0AString json =3D "{'data':[{'name':'Wallace'},{'name':'Grommit'=
}]}";=0AJSONObject obj =3D new JSONObject(json);=0AMyBean bean =3D (MyBean)=
JSONObject.toBean( obj, MyBean.class );=0A}=0A-----------------------------=
-------------------------------=0A=0A=0AAnd following exception occured.=0A=
=0A------------------------------------------------------------=0AException=
 in thread "main" net.sf.json.JSONException:=0Ajava.lang.NoSuchMethodExcept=
ion: Unknown property 'name'=0A=0Aat net.sf.json.JSONObject.toBean(JSONObje=
ct.java:439)=0Aat net.sf.json.JSONArray.toList(JSONArray.java:349)=0Aat net=
.sf.json.JSONObject.toBean(JSONObject.java:376)=0Aat net.sf.json.JSONObject=
.toBean(JSONObject.java=0A:325)=0Aat com.rolizen.test.jsonlib.JsonLibTest.t=
estTest(JsonLibTest.java:96)=0Aat=0A com.rolizen.test.jsonlib.JsonLibTest.m=
ain(JsonLibTest.java:21)=0ACaused by: java.lang.NoSuchMethodException: Unkn=
own property 'name'=0Aat=0Aorg.apache.commons.beanutils.PropertyUtilsBean.s=
etSimpleProperty(PropertyUtilsBean.java=0A:1741)=0Aat=0Aorg.apache.commons.=
beanutils.PropertyUtilsBean.setNestedProperty(PropertyUtilsBean.java:1648)=
=0Aat=0Aorg.apache.commons.beanutils.PropertyUtilsBean.setProperty(Property=
UtilsBean.java:1677)=0Aat=0Aorg.apache.commons.beanutils.PropertyUtils.setP=
roperty=0A(PropertyUtils.java:559)=0Aat net.sf.json.JSONObject.setProperty(=
JSONObject.java:484)=0Aat net.sf.json.JSONObject.toBean(JSONObject.java:408=
)=0A... 5 more=0A----------------------------------------------------------=
--=0A=0A=0AI think that at the 376 line in the JSONObject.java, invoking=0A=
JSONArray.toList(...) method,=0Athe second parameter, 'beanClass' should no=
t be passed.=0AInstead, null should be passed, I think.=0AThe intended clas=
s of list item is 'Person', but=0A 'beanClass' is 'MyBean',=0Aso PropertyUt=
ils cannot find 'name' property from 'beanClass'.=0A=0ADoesn't anyone have =
this problem?=0A=0ASorry for poor english. :(=0A=0A=0A---------------------=
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