[英]Jersey + HK2: EntityManager injection fails
I'm following this advice to get an EntityManager
injected into my Jersey + HK2 project. 我正在按照此建议将
EntityManager
注入到我的Jersey + HK2项目中。 For some reason, I suddenly see this exception when starting the service: 由于某种原因,启动服务时突然看到此异常:
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) ....
线程“主”中的异常java.lang.IllegalArgumentException:创建FactoryDescriptors必须具有Factory作为org.glassfish.hk2.utilities.FactoryDescriptorsImpl。(FactoryDescriptorsImpl.java:78)上第一个参数的协定。 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。 org.glassfish.hk2.utilities.ServiceLocatorUtilities.bind(ServiceLocatorUtilities.java:187)处的Complete(AbstractBinder.java:190)在org.glassfish.hk2.utilities.binding.AbstractBinder.bind(AbstractBinder.java:174) ..
Here's my code: 这是我的代码:
EMFFactory EMF工厂
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 EM工厂
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");
}
}
The ApplicationConfig
binds the factories: 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);
}
});
Can someone explain the exception? 有人可以解释例外情况吗?
Not sure if it will ever help anyone, but I found out how I broke it: 不知道它是否会帮助任何人,但是我发现我是如何打破它的:
I am creating a shaded uber-jar with the maven shade plugin. 我正在使用Maven Shade插件创建一个着色的uber-jar。 The plugin was complaining about overlapping classes, so I excluded the following package from being shaded:
该插件抱怨类重叠,因此我从阴影中排除了以下软件包:
<!-- 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>
That, my friends, was not a good idea. 我的朋友们,那不是一个好主意。 Removing the section fixed the problem.
删除该部分解决了问题。
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