¿cómo registro un servicio de conversión personalizado en la primavera 3/webflow 2?

Question

He estado tratando de seguir this example y usando the reference para guiarme, pero no estoy teniendo suerte.

he definido un convertidor:

import org.springframework.binding.convert.converters.StringToObject; 

import java.text.DateFormat; 
import java.text.SimpleDateFormat; 
import java.text.ParseException; 
import java.util.Date; 

public class StringToDateTwoWayConverter extends StringToObject { 
    private DateFormat format = null; 

    public StringToDateTwoWayConverter() { 
     super(StringToDateTwoWayConverter.class); 
     format = new SimpleDateFormat("MM/dd/yyyy"); 

    } 

    @Override 
    protected Object toObject(String string, Class targetClass) throws Exception { 
     Date date = null; 
     try { 
      date = format.parse(string); 
     } catch (ParseException e) { 
      e.printStackTrace(); 
      return null; 
     } 
     return date; 
    } 

    @Override 
    protected String toString(Object object) throws Exception { 
     Date date = (Date) object; 
     return format.format(date); 
    } 
} 

y una conversionService:

import org.springframework.binding.convert.service.DefaultConversionService; 
import org.springframework.stereotype.Component; 

@Component("conversionService") 
public class ApplicationConversionService extends DefaultConversionService 
{ 
    @Override 
    protected void addDefaultConverters() { 
     super.addDefaultConverters();   
     this.addConverter(new StringToDateTwoWayConverter()); 
     this.addConverter("shortDate", new StringToDateTwoWayConverter()); 

    } 
} 

y configuré:

<mvc:annotation-driven conversion-service="conversionService" /> 
<webflow:flow-builder-services id="flowBuilderServices" conversion-service="conversionService" .../> 

(instanciación explícita muestra el mismo error)

Sin embargo, en el inicio, estoy recibidos con esta excepción:

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '(inner bean)': Unsatisfied dependency expressed through constructor argument with index 0 of type [org.springframework.core.convert.ConversionService]: Could not convert constructor argument value of type [com.yadayada.converter.ApplicationConversionService] to required type [org.springframework.core.convert.ConversionService]: Failed to convert value of type 'com.yadayada.converter.ApplicationConversionService' to required type 'org.springframework.core.convert.ConversionService'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [com.yadayada.converter.ApplicationConversionService] to required type [org.springframework.core.convert.ConversionService]: no matching editors or conversion strategy found 
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:687) 
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:195) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:993) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:897) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) 
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:270) 
    ... 60 more 

estoy totalmente desconcertado por qué no su trabajo. El servicio de conversión implementa ConversionService a través de su clase base, por lo que no veo el problema. ¡Cualquier idea muy apreciada!

En respuesta a una respuesta más adelante, He intentado cambiar el servicio para poner en práctica el otro servicio de conversión:

import org.springframework.stereotype.Component; 
import org.springframework.core.convert.ConversionService; 

import org.springframework.format.support.FormattingConversionService; 

@Component ("conversionService") 
public class ApplicationConversionService extends FormattingConversionService implements org.springframework.core.convert.ConversionService 
{ 
    public ApplicationConversionService() { 
     this.addConverter(new StringToDateConverter2()); 

} 
} 

Pero ahora fallar a la inversa:

Caused by: java.lang.IllegalStateException: Cannot convert value of type [com.yadayada.converter.ApplicationConversionService] to required type [org.springframework.binding.convert.ConversionService] for property 'conversionService': no matching editors or conversion strategy found 
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:291) 
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:155) 
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:461) 
    ... 86 more 

Answer 1

Spring MVC y primavera Webflow utiliza diferentes jerarquías de convertidores de tipo. Por lo tanto, <mvc:annotation-driven ...> requiere org.springframework.core.convert.ConversionService, pero <webflow:flow-builder-services ...> requiere org.springframework.binding.convert.ConversionService.

Answer 2

En el código anterior, debe escribir super(Date.class) en su lugar super(StringToDateTwoWayConverter.class).