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Posted to user@struts.apache.org by "CRANFORD, CHRIS" <Ch...@setech.com> on 2011/02/14 07:18:23 UTC
JSON Error - Hibernate Entities
I am trying to return a list of hibernate entities to my AJAX call;
however, I get the following error message when JSONWriter tries to
serialize the objects. Can anyone explain why I am getting this error
and if there is something I can do to avoid it so I can pass my objects
back via a JSON call?
java.lang.IllegalAccessException: Class
org.apache.struts2.json.JSONWriter can not access a member of class
org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper
with modifiers "public"
Chris
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Re: RE: JSON Error - Hibernate Entities
Posted by Maurizio Cucchiara <ma...@gmail.com>.
My guess is that the json plugin was navigating the entire graph object,
trying to serialize the entire java world.
Maurizio Cucchiara
Il giorno 14/feb/2011 14.12, "CRANFORD, CHRIS" <Ch...@setech.com>
ha scritto:
> I eventually decided to write a DTO wrapper that took my POJO as a
constructor argument and extracted the fields I wanted to pass instead of
trying to serialize the entire object and that seemed to work. It just
appears that the amount of information within the POJO was creating issues
for JSON to serialize it; however I cannot isolate exactly what is the
problem in the POJO. All of the properties in the POJO are serializable :=/.
>
>> -----Original Message-----
>> From: Maurizio Cucchiara [mailto:maurizio.cucchiara@gmail.com]
>> Sent: Monday, February 14, 2011 2:40 AM
>> To: Struts Users Mailing List
>> Subject: Re: JSON Error - Hibernate Entities
>>
>> Your Item class is a simple POJO [1], isn't it?
>> Have you tried to use a DTO [2] object and see what happens?
>>
>> [1] http://en.wikipedia.org/wiki/Plain_Old_Java_Object
>> [2] http://martinfowler.com/eaaCatalog/dataTransferObject.html
>> On 14 February 2011 08:39, CRANFORD, CHRIS <Ch...@setech.com>
>> wrote:
>> >
>> > Here is the portion from the struts configuration:
>> > struts-warranty.xml
>> >
>> > <action
>> > name="ajaxWarrantyItemsAcList"
>> > class="com.setech.dw.warranty.web.WarrantyAssignmentItemAjaxAction">
>> > <result name="success" type="json">
>> > <param name="root">itemsList</param></result>
>> > </result>
>> > </action>
>> >
>> > The ajax action class looks like this:
>> >
>> > public class WarrantyAssignmentItemAjaxAction extends BaseAction
>> > {
>> > private List<Item> itemsList;
>> >
>> > public List<Item> getItemsList() {
>> > Return itemsList;
>> > }
>> >
>> > // other stuff removed from breavity
>> > }
>> >
>> > I always map the root object to the property I want returned for each
>> > AJAX call because I have noticed that JSON complains should it try to
>> > serialize things such as my service objects and so on.
>> >
>> > I did notice that because a few objects within the graph have cyclic
>> > redundancy that JSONWriter logged a few messages about that before it
>> > finally puked so I'm not sure if because my object graph has these
>> > circular references if that is creating problems for it or not.
>> >
>> >> -----Original Message-----
>> >> From: Maurizio Cucchiara [mailto:maurizio.cucchiara@gmail.com]
>> >> Sent: Monday, February 14, 2011 1:12 AM
>> >> To: Struts Users Mailing List
>> >> Subject: Re: JSON Error - Hibernate Entities
>> >>
>> >> Could you post your struts.xml and the action which you're trying to
>> >> serialize?
>> >> I'm pretty sure that your action class contains a reference to a
>> >> connection
>> >> object and the json plugin is trying to serialize it.
>> >> If I'm right you could simply change your root parameter via action
>> >> configuration inside the struts.xml file.
>> >>
>> >> Maurizio Cucchiara
>> >>
>> >> Il giorno 14/feb/2011 07.19, "CRANFORD, CHRIS"
>> >> <Ch...@setech.com>
>> >> ha scritto:
>> >> I am trying to return a list of hibernate entities to my AJAX call;
>> >> however, I get the following error message when JSONWriter tries to
>> >> serialize the objects. Can anyone explain why I am getting this
>> error
>> >> and if there is something I can do to avoid it so I can pass my
>> > objects
>> >> back via a JSON call?
>> >>
>> >> java.lang.IllegalAccessException: Class
>> >> org.apache.struts2.json.JSONWriter can not access a member of class
>> >>
>> >
>> org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrappe
>> >> r
>> >> with modifiers "public"
>> >>
>> >> Chris
>> >>
>> >>
>> >> --------------------------------------------------------------------
>> -
>> >> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>> >> For additional commands, e-mail: user-help@struts.apache.org
>> >
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>> > For additional commands, e-mail: user-help@struts.apache.org
>> >
>> >
>>
>>
>>
>> --
>> Maurizio Cucchiara
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>> For additional commands, e-mail: user-help@struts.apache.org
>>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
RE: JSON Error - Hibernate Entities
Posted by "CRANFORD, CHRIS" <Ch...@setech.com>.
I eventually decided to write a DTO wrapper that took my POJO as a constructor argument and extracted the fields I wanted to pass instead of trying to serialize the entire object and that seemed to work. It just appears that the amount of information within the POJO was creating issues for JSON to serialize it; however I cannot isolate exactly what is the problem in the POJO. All of the properties in the POJO are serializable :=/.
> -----Original Message-----
> From: Maurizio Cucchiara [mailto:maurizio.cucchiara@gmail.com]
> Sent: Monday, February 14, 2011 2:40 AM
> To: Struts Users Mailing List
> Subject: Re: JSON Error - Hibernate Entities
>
> Your Item class is a simple POJO [1], isn't it?
> Have you tried to use a DTO [2] object and see what happens?
>
> [1] http://en.wikipedia.org/wiki/Plain_Old_Java_Object
> [2] http://martinfowler.com/eaaCatalog/dataTransferObject.html
> On 14 February 2011 08:39, CRANFORD, CHRIS <Ch...@setech.com>
> wrote:
> >
> > Here is the portion from the struts configuration:
> > struts-warranty.xml
> >
> > <action
> > name="ajaxWarrantyItemsAcList"
> > class="com.setech.dw.warranty.web.WarrantyAssignmentItemAjaxAction">
> > <result name="success" type="json">
> > <param name="root">itemsList</param></result>
> > </result>
> > </action>
> >
> > The ajax action class looks like this:
> >
> > public class WarrantyAssignmentItemAjaxAction extends BaseAction
> > {
> > private List<Item> itemsList;
> >
> > public List<Item> getItemsList() {
> > Return itemsList;
> > }
> >
> > // other stuff removed from breavity
> > }
> >
> > I always map the root object to the property I want returned for each
> > AJAX call because I have noticed that JSON complains should it try to
> > serialize things such as my service objects and so on.
> >
> > I did notice that because a few objects within the graph have cyclic
> > redundancy that JSONWriter logged a few messages about that before it
> > finally puked so I'm not sure if because my object graph has these
> > circular references if that is creating problems for it or not.
> >
> >> -----Original Message-----
> >> From: Maurizio Cucchiara [mailto:maurizio.cucchiara@gmail.com]
> >> Sent: Monday, February 14, 2011 1:12 AM
> >> To: Struts Users Mailing List
> >> Subject: Re: JSON Error - Hibernate Entities
> >>
> >> Could you post your struts.xml and the action which you're trying to
> >> serialize?
> >> I'm pretty sure that your action class contains a reference to a
> >> connection
> >> object and the json plugin is trying to serialize it.
> >> If I'm right you could simply change your root parameter via action
> >> configuration inside the struts.xml file.
> >>
> >> Maurizio Cucchiara
> >>
> >> Il giorno 14/feb/2011 07.19, "CRANFORD, CHRIS"
> >> <Ch...@setech.com>
> >> ha scritto:
> >> I am trying to return a list of hibernate entities to my AJAX call;
> >> however, I get the following error message when JSONWriter tries to
> >> serialize the objects. Can anyone explain why I am getting this
> error
> >> and if there is something I can do to avoid it so I can pass my
> > objects
> >> back via a JSON call?
> >>
> >> java.lang.IllegalAccessException: Class
> >> org.apache.struts2.json.JSONWriter can not access a member of class
> >>
> >
> org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrappe
> >> r
> >> with modifiers "public"
> >>
> >> Chris
> >>
> >>
> >> --------------------------------------------------------------------
> -
> >> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> >> For additional commands, e-mail: user-help@struts.apache.org
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> > For additional commands, e-mail: user-help@struts.apache.org
> >
> >
>
>
>
> --
> Maurizio Cucchiara
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: JSON Error - Hibernate Entities
Posted by Maurizio Cucchiara <ma...@gmail.com>.
Your Item class is a simple POJO [1], isn't it?
Have you tried to use a DTO [2] object and see what happens?
[1] http://en.wikipedia.org/wiki/Plain_Old_Java_Object
[2] http://martinfowler.com/eaaCatalog/dataTransferObject.html
On 14 February 2011 08:39, CRANFORD, CHRIS <Ch...@setech.com> wrote:
>
> Here is the portion from the struts configuration:
> struts-warranty.xml
>
> <action
> name="ajaxWarrantyItemsAcList"
> class="com.setech.dw.warranty.web.WarrantyAssignmentItemAjaxAction">
> <result name="success" type="json">
> <param name="root">itemsList</param></result>
> </result>
> </action>
>
> The ajax action class looks like this:
>
> public class WarrantyAssignmentItemAjaxAction extends BaseAction
> {
> private List<Item> itemsList;
>
> public List<Item> getItemsList() {
> Return itemsList;
> }
>
> // other stuff removed from breavity
> }
>
> I always map the root object to the property I want returned for each
> AJAX call because I have noticed that JSON complains should it try to
> serialize things such as my service objects and so on.
>
> I did notice that because a few objects within the graph have cyclic
> redundancy that JSONWriter logged a few messages about that before it
> finally puked so I'm not sure if because my object graph has these
> circular references if that is creating problems for it or not.
>
>> -----Original Message-----
>> From: Maurizio Cucchiara [mailto:maurizio.cucchiara@gmail.com]
>> Sent: Monday, February 14, 2011 1:12 AM
>> To: Struts Users Mailing List
>> Subject: Re: JSON Error - Hibernate Entities
>>
>> Could you post your struts.xml and the action which you're trying to
>> serialize?
>> I'm pretty sure that your action class contains a reference to a
>> connection
>> object and the json plugin is trying to serialize it.
>> If I'm right you could simply change your root parameter via action
>> configuration inside the struts.xml file.
>>
>> Maurizio Cucchiara
>>
>> Il giorno 14/feb/2011 07.19, "CRANFORD, CHRIS"
>> <Ch...@setech.com>
>> ha scritto:
>> I am trying to return a list of hibernate entities to my AJAX call;
>> however, I get the following error message when JSONWriter tries to
>> serialize the objects. Can anyone explain why I am getting this error
>> and if there is something I can do to avoid it so I can pass my
> objects
>> back via a JSON call?
>>
>> java.lang.IllegalAccessException: Class
>> org.apache.struts2.json.JSONWriter can not access a member of class
>>
> org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrappe
>> r
>> with modifiers "public"
>>
>> Chris
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>> For additional commands, e-mail: user-help@struts.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
--
Maurizio Cucchiara
---------------------------------------------------------------------
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RE: JSON Error - Hibernate Entities
Posted by "CRANFORD, CHRIS" <Ch...@setech.com>.
Here is the portion from the struts configuration:
struts-warranty.xml
<action
name="ajaxWarrantyItemsAcList"
class="com.setech.dw.warranty.web.WarrantyAssignmentItemAjaxAction">
<result name="success" type="json">
<param name="root">itemsList</param></result>
</result>
</action>
The ajax action class looks like this:
public class WarrantyAssignmentItemAjaxAction extends BaseAction
{
private List<Item> itemsList;
public List<Item> getItemsList() {
Return itemsList;
}
// other stuff removed from breavity
}
I always map the root object to the property I want returned for each
AJAX call because I have noticed that JSON complains should it try to
serialize things such as my service objects and so on.
I did notice that because a few objects within the graph have cyclic
redundancy that JSONWriter logged a few messages about that before it
finally puked so I'm not sure if because my object graph has these
circular references if that is creating problems for it or not.
> -----Original Message-----
> From: Maurizio Cucchiara [mailto:maurizio.cucchiara@gmail.com]
> Sent: Monday, February 14, 2011 1:12 AM
> To: Struts Users Mailing List
> Subject: Re: JSON Error - Hibernate Entities
>
> Could you post your struts.xml and the action which you're trying to
> serialize?
> I'm pretty sure that your action class contains a reference to a
> connection
> object and the json plugin is trying to serialize it.
> If I'm right you could simply change your root parameter via action
> configuration inside the struts.xml file.
>
> Maurizio Cucchiara
>
> Il giorno 14/feb/2011 07.19, "CRANFORD, CHRIS"
> <Ch...@setech.com>
> ha scritto:
> I am trying to return a list of hibernate entities to my AJAX call;
> however, I get the following error message when JSONWriter tries to
> serialize the objects. Can anyone explain why I am getting this error
> and if there is something I can do to avoid it so I can pass my
objects
> back via a JSON call?
>
> java.lang.IllegalAccessException: Class
> org.apache.struts2.json.JSONWriter can not access a member of class
>
org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrappe
> r
> with modifiers "public"
>
> Chris
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: JSON Error - Hibernate Entities
Posted by Maurizio Cucchiara <ma...@gmail.com>.
Could you post your struts.xml and the action which you're trying to
serialize?
I'm pretty sure that your action class contains a reference to a connection
object and the json plugin is trying to serialize it.
If I'm right you could simply change your root parameter via action
configuration inside the struts.xml file.
Maurizio Cucchiara
Il giorno 14/feb/2011 07.19, "CRANFORD, CHRIS" <Ch...@setech.com>
ha scritto:
I am trying to return a list of hibernate entities to my AJAX call;
however, I get the following error message when JSONWriter tries to
serialize the objects. Can anyone explain why I am getting this error
and if there is something I can do to avoid it so I can pass my objects
back via a JSON call?
java.lang.IllegalAccessException: Class
org.apache.struts2.json.JSONWriter can not access a member of class
org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper
with modifiers "public"
Chris
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