我正在关注this advice将 EntityManager
注入(inject)到我的 Jersey + HK2 项目中。由于某种原因,我在启动服务时突然看到这个异常:
Exception in thread "main" java.lang.IllegalArgumentException: Creation of FactoryDescriptors must have Factory as a contract of the first argument at org.glassfish.hk2.utilities.FactoryDescriptorsImpl.(FactoryDescriptorsImpl.java:78) at org.glassfish.hk2.utilities.binding.AbstractBindingBuilder$FactoryTypeBasedBindingBuilder.complete(AbstractBindingBuilder.java:453) at org.glassfish.hk2.utilities.binding.AbstractBinder.resetBuilder(AbstractBinder.java:180) at org.glassfish.hk2.utilities.binding.AbstractBinder.complete(AbstractBinder.java:190) at org.glassfish.hk2.utilities.binding.AbstractBinder.bind(AbstractBinder.java:174) at 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(bind)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);
}
});
有人可以解释一下这个异常吗?
最佳答案
不确定它是否会对任何人有帮助,但我发现了我是如何打破它的:
我正在使用 Maven 阴影插件创建一个阴影 uber-jar。该插件提示类重叠,因此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 friend 们,这不是一个好主意。删除该部分解决了问题。
关于java - Jersey + HK2 : EntityManager injection fails,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38901159/