Question

我在春天使用DI有问题。我有3个类，其中一个是抽象的。我有问题添加一个服务没有另一个。我有这个例外：

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，为什么它无法转换请帮助

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

在我删除时删除这个异常：在我的abstractService中“实现常量”。现在它看起来像：

public abstract class AbstractService { ... }

但我不知道它不能实现只是常量的接口：

public interface Constants {

    int BEST_OF_GAMES = 9;

}

有人能解释一下这种行为吗？

Answer 1

正如您在异常中看到的，spring使用java代理：of type [sun.proxy.$Proxy14。

只能为接口创建java代理 - 而不是为类创建。

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" />

使用spring加载应用程序上下文时出现异常

1 个答案: