Question

我跟随this advice将EntityManager注入我的Jersey + HK2项目。出于某种原因，我在启动服务时突然看到此异常：

线程中的异常＆＃34; main＆＃34; java.lang.IllegalArgumentException：创建FactoryDescriptors必须将Factory作为第一个参数的契约在org.glassfish.hk2.utilities.FactoryDescriptorsImpl。（FactoryDescriptorsImpl.java:78）在org.glassfish.hk2.utilities.binding.AbstractBindingBuilder $ FactoryTypeBasedBindingBuilder.complete（AbstractBindingBuilder.java:453）在org.glassfish.hk2.utilities.binding.AbstractBinder.resetBuilder（AbstractBinder.java:180）在org.glassfish.hk2.utilities.binding.AbstractBinder.complete（AbstractBinder.java:190）在org.glassfish.hk2.utilities.binding.AbstractBinder.bind（AbstractBinder.java:174）在org.glassfish.hk2.utilities.ServiceLocatorUtilities.bind（ServiceLocatorUtilities.java:187） ....

这是我的代码：

EMFFactory

public class EMFFactory implements Factory<EntityManagerFactory> {
    private final Logger log = LoggerFactory.getLogger(EMFFactory.class);
    protected EntityManagerFactory emf;

    @Inject
    Config config;

    @PostConstruct
    public void setup() {
        Properties p = new Properties();
        p.put("javax.persistence.jdbc.url", config.getJdbcUrl());
        p.put("javax.persistence.jdbc.user", config.getJdbcUser());
        p.put("javax.persistence.jdbc.password", config.getJdbcPassword());
        emf = Persistence.createEntityManagerFactory("skp-server-PU", p);
        log.debug("JDBC URL: "+ config.getJdbcUrl());
    }

    @Override
    public EntityManagerFactory provide() {
        return emf;
    }

    @Override
    public void dispose(EntityManagerFactory instance) {}

}

EMFactory

public class EMFactory implements Factory<EntityManager> {
    private final Logger log = LoggerFactory.getLogger(EMFFactory.class);
    private EntityManager em;

    @Inject
    EntityManagerFactory emf;

    @PostConstruct
    public void setup() {
        em = emf.createEntityManager();
        log.debug("New EntityManager created");
    }

    @Override
    public EntityManager provide() {
        return em;
    }

    @Override
    public void dispose(EntityManager instance) {
        log.debug("Disposing of EntityManager");
    }

}

ApplicationConfig绑定工厂：

    ServiceLocatorUtilities.bind(applicationLocator, new AbstractBinder() {

        @Override
        protected void configure() {
            bindFactory(EMFFactory.class)
                    .to(EntityManagerFactory.class)
                    .in(Singleton.class);
            bindFactory(EMFactory.class)
                    .to(EntityManager.class);
        }
    });

有人可以解释这个例外吗？

Answer 1

不确定它是否会帮助任何人，但我发现了我是如何打破它的：

我正在创建一个带有maven shade插件的阴影超级jar。该插件抱怨重叠类，所以我将以下包排除在阴影之外：

<!-- This one comes with epcliselink, but I don't want shaded, hence the scope -->
<dependency>
    <groupId>org.eclipse.persistence</groupId>
    <artifactId>javax.persistence</artifactId>
    <version>2.1.0</version>
    <scope>provided</scope>
</dependency>

我的朋友们，这不是个好主意。删除该部分解决了问题。

Jersey + HK2：EntityManager注入失败

1 个答案: