从servlet启动hibernate报错误，请教！！

[ZweiVivian]

报错如下：
2016-6-16 11:21:04 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet Event Manager threw exception
org.hibernate.HibernateException: createCriteria is not valid without active transaction
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:341)
at com.sun.proxy.$Proxy0.createCriteria(Unknown Source)
at org.hibernate.tutorial.web.EventManagerServlet.listEvents(EventManagerServlet.java:82)
at org.hibernate.tutorial.web.EventManagerServlet.doGet(EventManagerServlet.java:63)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:620)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
---------------------------------------------------------------------------------
web.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/webapp_2_4.xsd">
<servlet>
<servlet-name>Event Manager</servlet-name>
<servlet-class>org.hibernate.tutorial.web.EventManagerServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Event Manager</servlet-name>
<url-pattern>/eventmanager</url-pattern>
</servlet-mapping>
<display-name>Archetype Created Web Application</display-name>
</web-app>
----------------------------------------------------------------------------------
hibernate.cfg.xml如下：
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!--Database connection settings -->
<property name="connection.driver_class">org.gjt.mm.mysql.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/hibernateTest</property>
<property name="connection.username">root</property>
<property name="connection.password">yaomei566</property>
<!--JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!--SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
<!--Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!--Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!--Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!--Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>
<mapping resource="org/hibernate/tutorial/domain/Event.hbm.xml"/>
<mapping resource="org/hibernate/tutorial/domain/Person.hbm.xml"/>
</session-factory>
</hibernate-configuration>
---------------------------------------------------------------------
EventManagerServlet.java文件如下：
public class EventManagerServlet extends HttpServlet {
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
SimpleDateFormat dateFormatter = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
try {// Begin unit of work
HibernateUtil.getSessionFactory().getCurrentSession()
.beginTransaction();
// Process request and render page...
// End unit of work
HibernateUtil.getSessionFactory().getCurrentSession()
.getTransaction().commit();
} catch (Exception ex) {
HibernateUtil.getSessionFactory().getCurrentSession()
.getTransaction().rollback();
if (ServletException.class.isInstance(ex)) {
throw (ServletException) ex;
} else {
throw new ServletException(ex);
}
}
// Write HTML header
PrintWriter out = response.getWriter();
out.println("<html><head><title>Event Manager</title></head><body>");
// Handle actions
if ("store".equals(request.getParameter("action"))) {
String eventTitle = request.getParameter("eventTitle");
String eventDate = request.getParameter("eventDate");
if ("".equals(eventTitle) || "".equals(eventDate)) {
out.println("<b><i>Please enter event title and date.</i></b>");
} else {
try {
createAndStoreEvent(eventTitle, dateFormatter.parse(eventDate));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
out.println("<b><i>Added event.</i></b>");
}
}
// Print page
printEventForm(out);
listEvents(out, dateFormatter);
// Write HTML footer
out.println("</body></html>");
out.flush();
out.close();

}

private void printEventForm(PrintWriter out) {
out.println("<h2>Add new event:</h2>");
out.println("<form>");
out.println("Title: <input name='eventTitle' length='50'/><br/>");
out.println("Date (e.g. 24.12.2009): <input name='eventDate' length='10'/><br/>");
out.println("<input type='submit' name='action' value='store'/>");
out.println("</form>");
}

private void listEvents(PrintWriter out, SimpleDateFormat dateFormatter) {
List result = HibernateUtil.getSessionFactory().getCurrentSession()
.createCriteria(Event.class).list();
if (result.size() > 0) {
out.println("<h2>Events in database:</h2>");
out.println("<table border='1'>");
out.println("<tr>");
out.println("<th>Event title</th>");
out.println("<th>Event date</th>");
out.println("</tr>");
Iterator it = result.iterator();
while (it.hasNext()) {
Event event = (Event) it.next();
out.println("<tr>");
out.println("<td>" + event.getTitle() + "</td>");
out.println("<td>" + dateFormatter.format(event.getDate())
+ "</td>");
out.println("</tr>");
}
out.println("</table>");
}
}

protected void createAndStoreEvent(String title, Date theDate) {
Event theEvent = new Event();
theEvent.setTitle(title);
theEvent.setDate(theDate);
HibernateUtil.getSessionFactory().getCurrentSession().save(theEvent);
}
}

请教大神，如何修改才能

[家里敷泥呀]

一般出问题了，你百度一下错误信息就能找到很多类似的问题和解决方案。 试着百度一下：“createCriteria is not valid without active transaction” 你可以找到： SSH下Hibernate事务问题createCriteria is not valid without active transaction - sqgme - ITeye技术网站 http://sqgme.iteye.com/blog/1005761 hibernate.HibernateException: createCriteria is not valid without active transaction_百度知道 http://zhidao.baidu.com/link?url=lMLTfNE9DnfgVP1zSgzjhQbmks9ied5tk6sb1Bi0JPX9RG4j6P3x-X0yhJTJXKsNAwXj6Ux1sZuCI2AavjbTTC8mARD7WEVin1mv5kSGb77 如果你报createSQLQuery is not valid without active transaction,请看这里 - yinjian520的专栏 - 博客频道 - CSDN.NET http://blog.csdn.net/yinjian520/article/details/8666695

[ZweiVivian]

问题在EventManagerServlet.java文件中。现在贴出正确的文件。

[ZweiVivian]

EventManagerServlet.java文件如下： public class EventManagerServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { SimpleDateFormat dateFormatter = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); try {// Begin unit of work HibernateUtil.getSessionFactory().getCurrentSession() .beginTransaction(); // Process request and render page... // Write HTML header PrintWriter out = response.getWriter(); out.println("<html><head><title>Event Manager</title></head><body>"); // Handle actions if ("store".equals(request.getParameter("action"))) { String eventTitle = request.getParameter("eventTitle"); String eventDate = request.getParameter("eventDate"); if ("".equals(eventTitle) || "".equals(eventDate)) { out.println("<b><i>Please enter event title and date.</i></b>"); } else { try { createAndStoreEvent(eventTitle, dateFormatter.parse(eventDate)); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } out.println("<b><i>Added event.</i></b>"); } } // Print page printEventForm(out); listEvents(out, dateFormatter); // Write HTML footer out.println("</body></html>"); out.flush(); out.close(); // End unit of work HibernateUtil.getSessionFactory().getCurrentSession() .getTransaction().commit(); } catch (Exception ex) { HibernateUtil.getSessionFactory().getCurrentSession() .getTransaction().rollback(); if (ServletException.class.isInstance(ex)) { throw (ServletException) ex; } else { throw new ServletException(ex); } } } private void printEventForm(PrintWriter out) { out.println("<h2>Add new event:</h2>"); out.println("<form>"); out.println("Title: <input name='eventTitle' length='50'/><br/>"); out.println("Date (e.g. 24.12.2009): <input name='eventDate' length='10'/><br/>"); out.println("<input type='submit' name='action' value='store'/>"); out.println("</form>"); } private void listEvents(PrintWriter out, SimpleDateFormat dateFormatter) { List result = HibernateUtil.getSessionFactory().getCurrentSession() .createCriteria(Event.class).list(); if (result.size() > 0) { out.println("<h2>Events in database:</h2>"); out.println("<table border='1'>"); out.println("<tr>"); out.println("<th>Event title</th>"); out.println("<th>Event date</th>"); out.println("</tr>"); Iterator it = result.iterator(); while (it.hasNext()) { Event event = (Event) it.next(); out.println("<tr>"); out.println("<td>" + event.getTitle() + "</td>"); out.println("<td>" + dateFormatter.format(event.getDate()) + "</td>"); out.println("</tr>"); } out.println("</table>"); } } protected void createAndStoreEvent(String title, Date theDate) { Event theEvent = new Event(); theEvent.setTitle(title); theEvent.setDate(theDate); HibernateUtil.getSessionFactory().getCurrentSession().save(theEvent); } } -------------------------------------------------------------- 错误在于开启hibernate事务之后没有任何操作就直接commit提交里，结束了事务，所以在出现操作事务的命令后就报错。