Converter Registration via context-scanning

Hi,

I've created few custom converters using the Spring converter API and annotated them with @Component. These converters are available in application context but don't get automatically registered with the conversionService unless I do it explicitly which means I can't use spring context/classpath scanning to auto-register custom converters. Any help is welcome.

Quote:

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These converters are available in application context but don't get automatically registered with the conversionService unless I do it explicitly which means I can't use spring context/classpath scanning to auto-register custom converters

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Can you share your configuration? and your solution?

and your error stack trace if you got one?

Hi,

To illustrate, I'm choosing the mvc-basic example in spring-samples. I created two classes org.springframework.samples.mvc.basic.account.X and org.springframework.samples.mvc.basic.account.Y and then I created a converter using spring API. The code is below

Code:

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public class X {
        private int value;
        public X(int value) {
                this.value = value;
        }
        public int getValue() {
                return value;
        }
       
}

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Code:

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public class Y {
        private int value;
        public Y(int value) {
                this.value = value;
        }
        public int getValue() {
                return value;
        }
}

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Code:

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@Component
public class MyConverter implements Converter<X, Y> {

        public Y convert(X arg0) {
                Y value = null;
                value = new Y(arg0.getValue());
                return value;
        }

}

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After this I copy the src/main/webapp/WEB-INF/spring directory to src/test/resources (This is done to support maven test configuration else I would have to manually create all the configuration myself) and create a junit test shown below

Code:

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package org.springframework.samples.mvc.basic;

import org.junit.Test;
import static org.junit.Assert.*;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.convert.ConversionService;
import org.springframework.samples.mvc.basic.account.X;
import org.springframework.samples.mvc.basic.account.Y;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@ContextConfiguration(locations={"classpath:spring/app-config.xml"})
@RunWith(SpringJUnit4ClassRunner.class)
public class SimpleTest {
        @Autowired
        private ConversionService service;
        @Test
        public void test() {
                assertTrue(service.canConvert(X.class, Y.class));
        }
}

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There's no change in the spring xml files app-config.xml and mvc-config.xml. Now the assertion in my test fails. But if I change the mvc-config.xml declarations to

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="
                http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

        <!-- Configures the @Controller programming model -->
        <mvc:annotation-driven conversion-service="conversionService"/>

        <!-- Forwards requests to the "/" resource to the "welcome" view -->
        <mvc:view-controller path="/" view-name="welcome"/>

        <!-- Configures Handler Interceptors -->       
        <mvc:interceptors>
                <!-- Changes the locale when a 'locale' request parameter is sent; e.g. /?locale=de -->
                <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />
        </mvc:interceptors>

        <!-- Saves a locale change using a cookie -->
        <bean id="localeResolver" class="org.springframework.web.servlet.i18n.CookieLocaleResolver" />
<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
                <property name="converters">
                        <list>
                                <bean class="org.springframework.samples.mvc.basic.account.MyConverter" />
                        </list>
                </property>
        </bean>
        <!-- Resolves view names to protected .jsp resources within the /WEB-INF/views directory -->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                <property name="prefix" value="/WEB-INF/views/"/>
                <property name="suffix" value=".jsp"/>
        </bean>

</beans>

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The assertion succeeds. Thus I've to register my converter manually and not via context-scanning as is desired.