我正在使用JSF 2.1 + JPA / Hibernate（随AS提供）+ Wildfly 9.2，但在项目部署期间，它没有启动并抛出与@Id注释相关的错误，已经给出了
这是我的 PostsEntity 类的片段：
@Entity
public class PostsEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "post_id")
private Integer post_id;
public PostsEntity() {
}
public Integer getPostId() {
return post_id;
}
public void setPostId(Integer id) {
this.post_id = id;
}
}
这是我的 persistence.xml ：
<?xml version="1.0" encoding="UTF-8"?>
<persistence
xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="conn">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:/belike_ds</jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.hbm2ddl.auto" value="create" />
</properties>
</persistence-unit>
</persistence>
这是完整的堆栈跟踪：
13:52:38,898 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 83) MSC000001: Failed to start service jboss.persistenceunit."belike.war#conn": org.jboss.msc.service.StartException in service jboss.persistenceunit."belike.war#conn": javax.persistence.PersistenceException: [PersistenceUnit: conn] Unable to build Hibernate SessionFactory
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:172)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:117)
at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:665)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:182)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
at org.jboss.threads.JBossThread.run(JBossThread.java:320)
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: conn] Unable to build Hibernate SessionFactory
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:1249)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.access$600(EntityManagerFactoryBuilderImpl.java:120)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:860)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:425)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:849)
at org.jboss.as.jpa.hibernate4.TwoPhaseBootstrapImpl.build(TwoPhaseBootstrapImpl.java:44)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:154)
... 7 more
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.rafaelsilverioamaral.belike.entities.PostsEntity
at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:277)
at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:224)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:775)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3845)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3799)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1412)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1846)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:857)
... 12 more
13:52:38,901 ERROR [org.jboss.as.controller.management-operation] (DeploymentScanner-threads - 2) WFLYCTL0013: Operation ("full-replace-deployment") failed - address: ([]) - failure description: {"WFLYCTL0080: Failed services" => {"jboss.persistenceunit.\"belike.war#conn\"" => "org.jboss.msc.service.StartException in service jboss.persistenceunit.\"belike.war#conn\": javax.persistence.PersistenceException: [PersistenceUnit: conn] Unable to build Hibernate SessionFactory
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: conn] Unable to build Hibernate SessionFactory
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.rafaelsilverioamaral.belike.entities.PostsEntity"}}
13:52:38,980 INFO [org.jboss.as.server] (DeploymentScanner-threads - 2) WFLYSRV0016: Replaced deployment "belike.war" with deployment "belike.war"
13:52:38,980 INFO [org.jboss.as.controller] (DeploymentScanner-threads - 2) WFLYCTL0183: Service status report
WFLYCTL0186: Services which failed to start: service jboss.persistenceunit."belike.war#conn": org.jboss.msc.service.StartException in service jboss.persistenceunit."belike.war#conn": javax.persistence.PersistenceException: [PersistenceUnit: conn] Unable to build Hibernate SessionFactory
service jboss.persistenceunit."belike.war#conn"
主要错误说：
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.rafaelsilverioamaral.belike.entities.PostsEntity
但是我不明白为什么会抛出这样的错误，因为post_id已经注明了@Id作为我的实体ID。