Exception when loading application context with spring

Question

I have problem to use DI in spring. I have 3 classes which one of them is abstract. I have problem to add one service no another. I got this exception:

Caused by: java.lang.IllegalStateException: Cannot convert value of type [sun.proxy.$Proxy14 implementing org.toursys.processor.service.Constants,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [org.toursys.processor.service.GameService] for property 'gameService': no matching editors or conversion strategy found

I am really desperate why it cannot convert please help

my app context:

<?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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:oxm="http://www.springframework.org/schema/oxm"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <import resource="repositoryContext.xml" />


    <bean id="abstractService" class="org.toursys.processor.service.AbstractService" abstract="true">
        <property name="tournamentAggregationDao" ref="tournamentAggregationDao" />
    </bean>

    <bean id="gameService" class="org.toursys.processor.service.GameService" parent="abstractService" />

    <bean id="groupService" class="org.toursys.processor.service.GroupService" parent="abstractService">
        <property name="gameService" ref="gameService" />
    </bean>

</beans>

classes:

public abstract class AbstractService implements Constants {

    protected TournamentAggregationDao tournamentAggregationDao;
    protected final Logger logger = LoggerFactory.getLogger(getClass());

    @Required
    public void setTournamentAggregationDao(TournamentAggregationDao tournamentAggregationDao) {
        this.tournamentAggregationDao = tournamentAggregationDao;
    }
}

--

public class GameService extends AbstractService {


}

--

public class GroupService extends AbstractService {

    private GameService gameService;

    @Required
    public void setGameService(GameService gameService) {
        this.gameService = gameService;
    }
}

UPDATE:

ok get rid of this exception when I delete: "implements Constants" in my abstractService. Now it look like:

public abstract class AbstractService { ... }

but I have no idea which it cant implement interface where is just constants:

public interface Constants {

    int BEST_OF_GAMES = 9;

}

Can someone explain me this behaviour ?

Your implements Constants is anti-pattern. Use import static Constants.*; instead. — Stephen C
– Stephen C, Commented Sep 18, 2013 at 13:52

René Link · Accepted Answer · 2013-09-18 13:42:04Z

1

As you can see in the exception spring uses java proxies: of type [sun.proxy.$Proxy14 .

A java proxy can only be created for interfaces - not for classes.

Change your code in this way:

 public interface GameService  {
 }

 public class GameServiceImpl extends AbstractService implements GameService {
 }

and your bean.xml to

<bean id="gameService" class="org.toursys.processor.service.GameServiceImpl" parent="abstractService" />

answered Sep 18, 2013 at 13:42

René Link

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