Yesterday I had to modify the JSON during creation from an object. I want to add validation hints along with the json that travelled to the server. Spring has converters and uses MappingJacksonHttpMessageConverter to convert the object returned by the controller. SO i want to modify the converter to include the hints in the JSON generated.
A lot of googling happened for no luck finally I got the solution which reads as follows
First override the default handler: MappingJsonHttpMessageConverter
public class JSONHttpMessageConverter extends MappingJacksonHttpMessageConverter {
…
…
@Override
protected void writeInternal(Object object, HttpOutputMessage outputMessage) throws IOException,
HttpMessageNotWritableException {
now in spring xml modify the mvc:annotation-config; Please make sure that u dont have another annotation-config with in any of the spring xmls in ur classpath.
<mvc:annotation-driven validator="ExtendedValidatationAdaptor" >
<mvc:message-converters register-defaults="true" >
<bean class="wavecrest.foundation.validate.web.JSONHttpMessageConverter" p:somebean-ref="somref" />
</mvc:message-converters>
</mvc:annotation-driven>
and this should do.
Tested with spring-web-3.1.1.RELEASE.jar
I am not sure if this is the root cause, however when i do the below the error is gone….
if u unselect the checkbox: limit console output and if u r console generates a lot of print stmts u get the error.
