javax.mail.Session cannot be cast to javax.mail.Session

[JustinCase]

Getting this error in my project. When googling this issue, it seems it is caused by more than 1 version of the mail.jar being in the project. However, i cannot find it anywhere other than in the tomcat libraries. If i remove it from there, i get a different exception saying the .jar cannot be found, witch would seem to indicate that i only have 1 version of the file. Anyone have a clue what the problem might be? Is it OS X Lion and some file version checking that is the issue?

[Tolls]

You're not deploying it with your app are you?

[Oih]

Hi JustInCase, I'm running into exactly the same problem:

I deploy my application on Glassfish, in which I have created a java mail session. When I look for the session and try to cast Object to javax.mail.Session I get the same ClassCastException: javax.mail.Session cannot be cast to javax.mail.Session. If I remove mail.jar from my app lib folder then the server doesnt even find the needed classes.

Did you finally find any solution to this? Just in case, I'm using Glassfish 3.1.1 and java-6-sun-1.6.0.26.

[wayne]

Hi,

I am also looking for a solution with exactly the same problem. Have you found any one? Thanks.

[wayne]

I finally figured out what went wrong. There is a third party .jar file under application/WEB-INF/lib. That jar file also contains javax.mail class. I should have checked third party .jar file earlier.