IllegalStateException：没有可用的Commons ObjectPool

Question

在我的项目中，我使用spring-boot

我有这样的代码

class ConfigurationUtils {
   @Bean(name="retriver")
    @Scope("prototype")
    public Retriver retriver() {

        Retriver dr = null;
        try {
            dr = new Retriver(config.getUserName(),
                    config.getPassword(),
                    config.getUrl());
        } catch (Exception e) {
            logger.error("Exepction in creating SOAP datasource connection");
        } 

        return dr;
    }


    @Bean
    public CommonsPool2TargetSource RetriverPooledTargetSource() {
        final CommonsPool2TargetSource commonsPoolTargetSource = new CommonsPool2TargetSource();
        commonsPoolTargetSource.setTargetBeanName("Retriver");
        commonsPoolTargetSource.setTargetClass(Retriver.class); //Getting error here....
        commonsPoolTargetSource.setMaxSize(10);
        return commonsPoolTargetSource;
    }

    @Bean
    public ProxyFactoryBean proxyFactoryBean() {
        ProxyFactoryBean p = new ProxyFactoryBean();
        p.setTargetSource(RetriverPooledTargetSource());
        return p;
    }

}

在我的服务班级中，如下所示致电

CommonsPool2TargetSource pool  = configurationUtils.dataRetrieverPooledTargetSource();

    dataRetriever  = (DataRetriever) pool.getTarget();
    System.out.println(" " + dataRetriever);

它引发以下异常：我在这里做什么错了？

由于：java.lang.IllegalStateException：没有可用的Commons ObjectPool     在org.springframework.util.Assert.state（Assert.java:73）     在org.springframework.aop.target.CommonsPool2TargetSource.getTarget（CommonsPool2TargetSource.java:234）     在com.spgmi.ca.prescore.actor.CompanyTransIndustryActor.preStart（CompanyTransIndustryActor.java:63）     在akka.actor.Actor $ class.aroundPreStart（Actor.scala：510）     在akka.actor.UntypedActor.aroundPreStart（UntypedActor.scala：95）     在akka.actor.ActorCell.create（ActorCell.scala：590）处     ...还有9个