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Hibernate version:hibernate3

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:
HTTP Status 500 -

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: failed to lazily initialize a collection of role: src.model.Forums.discussList - no session or session was closed
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
src.control.DiscussForum.doGet(Unknown Source)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
root cause
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: src.model.Forums.discussList - no session or session was closed
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:191)
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:183)
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:48)
org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:134)
org.apache.jsp.pages.forum.discuss_jsp._jspService(discuss_jsp.java:62)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
src.control.DiscussForum.doGet(Unknown Source)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs.

Apache Tomcat/5.0.27


Name and version of the database you are using:MySQL v4.0

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:


My project works fine when the lazy is set to false but gives trouble when lazy is set to true. I am using the appfuse architecture with spring and hibernate. My database is MYSQL v5.0 and am using Apache Tomcat Server.
Please help


regards
Chanchal

you have to initialize the collection before sending data to presentation/busines tier . accessing collections/accociations outside a session with out explicit initialization throws the LazyInitializationException

Do you mean we should manually initiallize the set. then where is the ORM being performed my appfuse

it is ORM , lazy initialization works fine only inside a session . its still a question mark on how to do it efficiently . as far as i came across , one way is to initialize the collections when u are using lazy=true, or use a query with eager fetch on the particular collection . i think DTOs may be of help too, but in that case , still you have to do the things above

Thankyou very much For your help.....
I get some idea about it now. Can you please give me some sample code if it is not too much trouble.

check out this link
http://www.hibernate.org/43.html

i may appreciate your rating if this proves helpful :)