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我在春天使用 DI 时遇到问题。我有 3 个类，其中一个是抽象的。我在添加一项服务时遇到问题。我得到了这个例外：

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

我真的很绝望为什么它不能转换请帮忙

我的应用上下文：

<?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>

类：

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;
    }
}

更新：

好的，当我在我的 abstractService 中删除：“implements Constants”时摆脱这个异常。现在它看起来像：

public abstract class AbstractService { ... }

但我不知道它不能实现接口，其中只是常量：

public interface Constants {

    int BEST_OF_GAMES = 9;

}

有人可以向我解释这种行为吗？

4

1 回答 1

1

正如您在异常 spring uses java proxies: 中看到的那样of type [sun.proxy.$Proxy14。

只能为接口创建 java 代理 - 不能为类创建。

以这种方式更改您的代码：

 public interface GameService  {
 }

 public class GameServiceImpl extends AbstractService implements GameService {
 }

和你的 bean.xml 到

<bean id="gameService" class="org.toursys.processor.service.GameServiceImpl" parent="abstractService" />
于 2013-09-18T13:42:04.360 回答