Hi,
i'm new to hibernate and have problems by saving a man-to-many object to the database.
Here is a short overview:
Table1: user -> id, ...
Table2: meeting ->id,...
Table3: user_has_meeting ->user_id, meeting_id, status
-> Classes: User, Meeting, UserHasMeetingId, UserHasMeeting
So i've an object User user, Meeting meeting and want to create an new relation between them:
Quote:
UserHasMeetingtId attendee = new UserHasMeetingId(user.getId(), event.getId());
UserHasMeeting attendance = new UserHasMeeting(attendee, user, event, "false");
Now I want to save this object to database:
Quote:
try {
session = HibernateUtil.getSessionFactory().getCurrentSession();
org.hibernate.Transaction tx = session.beginTransaction();
session.save(attendance);
session.flush();
session.refresh(attendance);
tx.commit();
} catch (Exception e) {
e.printStackTrace();
}
The Server log throws following Exception:
Quote:
16.06.2010 13:41:02 org.hibernate.LazyInitializationException <init>
SCHWERWIEGEND: could not initialize proxy - no Session
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:57)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:150)
at eventmngr.User$$EnhancerByCGLIB$$26e300d8.getEmail(<generated>)
at org.apache.jsp.addAttendee_jsp._jspService(addAttendee_jsp.java:73)
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:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
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.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:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
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:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:619)
I tried to open a new session:
if (!session.isOpen())
session = HibernateUtil.getSessionFactory().openSession()
But this is not the solution. The object will not saved to the database.
Can you help me? :)
Greezu
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