Hi all,

I'm using Hibernate 3.1 and created an application which works fine as standalone. But if I deploy the application to my tomcat I receive a ClassCastException within the following code passage:

Session session = SessionUtil.getCurrentSession();
Criteria criteria = session.createCriteria(User.class);
List userList = criteria.list();
for (int i=0; i<userList.size(); i++)
{
user = (User)userList.get(i);
System.out.println(user.getFirstName());
}

Can anybody tell me why this works as standalone but not within my tomcat?

(btw, the userList attribute contains all my database entries, I saw this during debug; it only seems to be impossible to read these entries because of the casting problems)

Thank You very very much if anyone has the solution for this problem!

Cheers Florian!

P.S.: the default errors for ClassCastExceptions eg implementing the Serializable interface I already have checked, so please consider this within Your answers...

You do not have two diff Classes called User here? Exactly what is the app trying to cast to User then? Use some logging statements to figure this out. And, as always, double check any subtle differences in the two environments (like class loading order) . Not too sure what you mean at the end there.

Hi,

thanx for Your reply!

I checked for double classes and I'm 100% sure there are no doubles classes within my project; but as You already mentioned this could be a problem of class loading was also my first thought...but I can't think of where I could have gone wrong:

- I modified the start-script of my Tomcat in order to pickup my application classes;
- I copied all the required jars to the WEB-INF/lib within my tomcat

The application classes are found perfectly so where could be the error?

Perhaps anyone out there has similar experinece with tomcat 5 and ClassCastExceptions...if so please help me!

Thank You very much, Flo!

Ok...I used some debug statements and found out the following:

-in the list there are 13 entries
-every entry is of the class util.hibernate.entity.User (found out by using the getClass()-method)

And all I want is to cast the entries to util.hibernate.entity.User-objects! So this should be possible witjout problems but I have no idea for which reason I receive the ClassCastException!

Sounds stupid but that's what my application does!

Btw the application itself (the casting etc.) should be ok because I can run the app easily as standalone...

Thanx in advance, Flo!

post a stack trace. i have to see the method name to believe it. what method is "user = (User)userList.get(i);" in?

Ok...here comes the code; perhaps I should add sth. otherwise You will be confused if You read through the stack trace: I'm not using a "real" JSP or sth. like this, I'm using the Casabac framework which itself is a Web-App within my tomcat...but that should not matter, just wanted to tell You about this, otherwise You'd wonder about the exotic class names appearing within the stack trace...


the login-method:

public boolean login(String username,String password)
throws Exception
{
// check whether username and password match
util.hibernate.entity.User user = null;
Session session = SessionUtil.getCurrentSession();
Criteria criteria = session.createCriteria(util.hibernate.entity.User.class);
List userList = criteria.list();
System.out.println("*********************************" +userList.size());

for (int i=0; i<userList.size(); i++)
{
System.out.println(userList.get(i));
}

for (int i=0; i<userList.size(); i++)
{
user = (util.hibernate.entity.User)userList.get(i);
}
return false;
}

StackTrace:

*********************************13
util.hibernate.entity.User@187e184
util.hibernate.entity.User@1e6cf07
util.hibernate.entity.User@e51bda
util.hibernate.entity.User@187c12a
util.hibernate.entity.User@19ae493
util.hibernate.entity.User@14a616
util.hibernate.entity.User@1a3f178
util.hibernate.entity.User@4218cb
util.hibernate.entity.User@169c6f2
util.hibernate.entity.User@1843ca4
util.hibernate.entity.User@a96606
util.hibernate.entity.User@16954e1
util.hibernate.entity.User@4391f0
java.lang.ClassCastException
at model.forum.Login.login(Login.java:42)
at casabac.forum.LoginAdapter.onLogin(LoginAdapter.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.softwareag.cis.server.InteractionModel.invokeMethodInternally(Unk
nown Source)
at com.softwareag.cis.server.InteractionModel.invokeMethod(Unknown Sourc
e)
at com.softwareag.cis.server.XMLProcessor.processXML(Unknown Source)
at com.softwareag.cis.server.Connector.doPost(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFol
lowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:684)
at java.lang.Thread.run(Unknown Source)