Can not construct instance of java.util.Date from String value - not a valid representation

Open your POJO, annotate the date field declaration like so

@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "<your_date_pattern>")

Where your_date_pattern can be something like

yyyy-MM-dd HH:mm:ss

Done

I guess you are using Jersey as a JAX-RS implementation. Have you left some details out from the stacktrace? Reading the stacktrace it seems the Jersey receives a String instead of a Date: Can not construct instance of java.util.Date from String value 'Thu Jul 31 07:00:00 CEST 2014'. If your class com.rest.entities.MvtSwapsIn["datebl"]) declares a date, this behaviour is a bit strange.

Anyway, for Jackson to work, one suggestion is to register a Jackson ObjectMapper to the REST config with a ContextResolver (this applies to both Jackson 1.x and 2.x). Try putting a breakpoint in both the constructor and getContext()-method to see if they are invoked at runtime:

public class ObjectMapperConfigContextResolver implements     ContextResolver<ObjectMapper> {

ObjectMapper mapper;

public ObjectMapperConfigContextResolver() {
    mapper.setDateFormat(new SimpleDateFormat("<your pattern>"));
}

@Override
public ObjectMapper getContext(Class<?> type) {
    return mapper;
}

}

The @Provider annotation should make JAX-RS pick up your configured ObjectMapper. If no you can do it manually:

@ApplicationPath("/")
public class RestApplication extends Application {
    @Override
    public Set<Class<?>> getClasses() {
        Set<Class<?>> classes = new HashSet<>();
        classes.add(ObjectMapperConfigContextResolver.class);
        return classes;
    }
}

It would be helpful if you provided some information from your pom.xml (if you are using Maven).

Thanks a lot Jim, Jon.

Thomas. Even if i found a workaround, i will check what you wrote carefully.

Nevertheless,i finally managed to solve this. As i was not able to understand if problem was on Serialization(JavaApp) i've decided to have a look on the other side Deserialization(REST WS).

Quick reminder : SOAP WS ----> JAVA APP ----> REST WS

Date received from SOAP WS was exactly received as String, its value was

2014-07-31 07:00:00.0

Within JAVA App, i did

            DateFormat originalFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss.S");
            DateFormat targetFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date date = originalFormat.parse(deliverydate);
            String formattedDate = targetFormat.format(date); 

            msi.setDatebl(date);

At this point, i had still the same error until i saw that JSON sent to REST WS was

{"id":87434958,"datebl":"Thu Jul 31 07:00:00 CEST 2014","price":15.45,"model":"AAA"}

*Some parts of JSON Object were cutted.

Within REST WS, i've added the following to the pojo (Probably one of them is necessary) and created a custom deserializer as follows :

@JsonDeserialize(using = CustomJsonDateDeserializer.class)
private java.util.Date    datebl;

@JsonDeserialize(using = CustomJsonDateDeserializer.class)
public void setDatebl(java.util.Date datebl) {
    this.datebl = datebl;
}



import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.DeserializationContext;
import org.codehaus.jackson.map.JsonDeserializer;



public class CustomJsonDateDeserializer extends JsonDeserializer<Date>
{
    @Override
    public Date deserialize(JsonParser jsonparser,
            DeserializationContext deserializationcontext) throws IOException, JsonProcessingException {

        DateFormat formatter = new SimpleDateFormat("EEE MMM dd HH:mm:ss z yyyy", Locale.US);
        String dateStr = jsonparser.getText();
        try {
            return (Date)formatter.parse(dateStr);
        } catch (ParseException e) {
            throw new RuntimeException(e);
        }

    }
}

At this point, update has been done properly. Date was found in database in a proper format.

Readings : How to convert "Mon Jun 18 00:00:00 IST 2012" to 18/06/2012?