我正在使用由Hibernate Tools生成的这个DAO类：
/**
* Home object for domain model class Empleados.
* @see com.hibernate.Empleados
* @author Hibernate Tools
*/
public class EmpleadosHome {
private static final Log log = LogFactory.getLog(EmpleadosHome.class);
private final SessionFactory sessionFactory = getSessionFactory();
protected SessionFactory getSessionFactory() {
try {
return (SessionFactory) new InitialContext()
.lookup("java:/hibernate/SessionFactory");
} catch (Exception e) {
log.error("Could not locate SessionFactory in JNDI", e);
throw new IllegalStateException(
"Could not locate SessionFactory in JNDI");
}
}
public void persist(Empleados transientInstance) {
log.debug("persisting Empleados instance");
try {
sessionFactory.getCurrentSession().persist(transientInstance);
log.debug("persist successful");
} catch (RuntimeException re) {
log.error("persist failed", re);
throw re;
}
}
public void attachDirty(Empleados instance) {
log.debug("attaching dirty Empleados instance");
try {
sessionFactory.getCurrentSession().saveOrUpdate(instance);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
}
public void attachClean(Empleados instance) {
log.debug("attaching clean Empleados instance");
try {
sessionFactory.getCurrentSession().lock(instance, LockMode.NONE);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
}
public void delete(Empleados persistentInstance) {
log.debug("deleting Empleados instance");
try {
sessionFactory.getCurrentSession().delete(persistentInstance);
log.debug("delete successful");
} catch (RuntimeException re) {
log.error("delete failed", re);
throw re;
}
}
public Empleados merge(Empleados detachedInstance) {
log.debug("merging Empleados instance");
try {
Empleados result = (Empleados) sessionFactory.getCurrentSession()
.merge(detachedInstance);
log.debug("merge successful");
return result;
} catch (RuntimeException re) {
log.error("merge failed", re);
throw re;
}
}
public Empleados findById(java.lang.Integer id) {
log.debug("getting Empleados instance with id: " + id);
try {
Empleados instance = (Empleados) sessionFactory.getCurrentSession()
.get("com.hibernate.Empleados", id);
if (instance == null) {
log.debug("get successful, no instance found");
} else {
log.debug("get successful, instance found");
}
return instance;
} catch (RuntimeException re) {
log.error("get failed", re);
throw re;
}
}
public List findByExample(Empleados instance) {
log.debug("finding Empleados instance by example");
try {
List results = sessionFactory.getCurrentSession().createCriteria(
"com.hibernate.Empleados").add(Example.create(instance))
.list();
log.debug("find by example successful, result size: "
+ results.size());
return results;
} catch (RuntimeException re) {
log.error("find by example failed", re);
throw re;
}
}
}
这是我的hibernate.cfg.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="SessionFactory">
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">1234</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3307/ejemplos</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
<property name="connection.autocommit">true</property>
<property name="current_session_context_class">jta</property>
<mapping resource="com/hibernate/Empleados.hbm.xml" />
</session-factory>
</hibernate-configuration>
我得到以下异常：
org.hibernate.HibernateException: Unable to locate current JTA transaction
at org.hibernate.context.JTASessionContext.currentSession(JTASessionContext.java:88)
at org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:574)
at com.hibernate.EmpleadosHome.findById(EmpleadosHome.java:95)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:75)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
我不确定您的环境是否支持JTA和自动事务处理（至少，不是您当前的设置）。实际上，如果您不打算访问多个事务资源，我的建议是使用默认的JDBC方法，即修改您的hibernate.cfg.xml如下：
<property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
<property name="current_session_context_class">thread</property>
并重新生成代码（我对Hibernate Tools生成的DAO没有多少经验，我不保证结果）。
结帐此页：https://forum.hibernate.org/viewtopic.php?f=1&t=951402
看起来它可能是您的appserver的配置问题
用openSession（）替换getCurrentSession（）