我正在尝试使用两种数据库连接形式持久性API
的persistence.xml：
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="futurepay">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>jdbc/futurepay</jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.default_schema" value="futurepay" />
</properties>
</persistence-unit>
<persistence-unit name="bbpcOracle">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>oracle/bbpc</jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.show_sql" value="true" />
</properties>
</persistence-unit>
</persistence>
我在jta下面使用了两个entitymange：
@PersistenceContext(unitName = "futurepay", type= PersistenceContextType.TRANSACTION)
public EntityManager futurePayEntityManager;
@PersistenceContext(unitName = "bbpcOracle", type= PersistenceContextType.TRANSACTION)
public EntityManager bbpcPayEntityManager;
在下面的课程中，我使用的是bbpcEntityManager：
public class SapfiPostionDAOImpl extends GenericDAOImpl implements ISapfiPostionDAO {
private static final Logger LOGGER = Logger.getLogger(SapfiPostionDAOImpl.class);
@SuppressWarnings("unchecked")
@Override
public List<ShygSapPostHeader> getCustomerFileReqDtls(int statusId) {
LOGGER.info("getCustomerFileReqDtls");
List<ShygSapPostHeader> resultList = new ArrayList<>();
Query query = bbpcPayEntityManager.createNamedQuery("ShygSapPostHeader.getDetails");
try {
resultList = query.getResultList();
}
catch (Exception e) {
LOGGER.info("Exception occured while fetching data from ShygSapPostHeader"+e);
}
return resultList;
}
}
我正在使用一些用于mysql的表和一些来自oracle的表。在oracle表中我使用了序列生成器。
例如：
@Entity
@Table(name = "SHYG_SAP_POST_HEADER")
@NamedQueries({
@NamedQuery(name = "ShygSapPostHeader.getDetails",query="select model from ShygSapPostHeader")
})
@SequenceGenerator(name = "SAP_POSTING_SEQ_GENERATOR", sequenceName = "SAP_POSTING_SEQ", initialValue = 1, allocationSize = 1)
public class ShygSapPostHeader implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SAP_POSTING_SEQ_GENERATOR")
@Column(name = "SAP_POST_ID")
private Long sapPostId;
@Column(name = "STORE_CODE")
private String storeCode;
@Column(name = "REQUEST_DATE")
private String requestDate;
.............
.............
但是当我要在glassfish中部署它时，我会遇到异常。
例外：
Severe: Exception while preparing the app : [PersistenceUnit: futurepay] Unable to build EntityManagerFactory
javax.persistence.PersistenceException: [PersistenceUnit: futurepay] Unable to build EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:892)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:73)
at org.glassfish.persistence.jpa.PersistenceUnitLoader.loadPU(PersistenceUnitLoader.java:206)
at org.glassfish.persistence.jpa.PersistenceUnitLoader.<init>(PersistenceUnitLoader.java:120)
at org.glassfish.persistence.jpa.JPADeployer$1.visitPUD(JPADeployer.java:224)
at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:495)
at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:233)
at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)
at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:871)
at org.glassfish.javaee.full.deployment.EarDeployer.prepareBundle(EarDeployer.java:290)
at org.glassfish.javaee.full.deployment.EarDeployer.access$200(EarDeployer.java:86)
at org.glassfish.javaee.full.deployment.EarDeployer$1.doBundle(EarDeployer.java:141)
at org.glassfish.javaee.full.deployment.EarDeployer$1.doBundle(EarDeployer.java:138)
at org.glassfish.javaee.full.deployment.EarDeployer.doOnBundles(EarDeployer.java:215)
at org.glassfish.javaee.full.deployment.EarDeployer.doOnAllTypedBundles(EarDeployer.java:224)
at org.glassfish.javaee.full.deployment.EarDeployer.doOnAllBundles(EarDeployer.java:250)
at org.glassfish.javaee.full.deployment.EarDeployer.prepare(EarDeployer.java:138)
at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:871)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:410)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:240)
at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:389)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:348)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:363)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1085)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:95)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1291)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1259)
at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:461)
at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:212)
at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:179)
at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
at com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call(ContainerMapper.java:354)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.bbpc.model.ShygSapPostHeader]
at org.hibernate.id.factory.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:117)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:177)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:257)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1385)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:954)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:883)
... 46 more
Caused by: org.hibernate.MappingException: Dialect does not support sequences
at org.hibernate.dialect.Dialect.getSequenceNextValString(Dialect.java:668)
at org.hibernate.id.SequenceGenerator.configure(SequenceGenerator.java:97)
at org.hibernate.id.SequenceHiLoGenerator.configure(SequenceHiLoGenerator.java:64)
at org.hibernate.id.factory.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:110)
... 51 more
如果我从类中删除序列生成器部分，那么它的工作正常。但我需要序列生成器。
那么为什么当我使用序列生成器时会发生这种异常呢？