Hi,

we have to deploy an application as a tomcat 9 servlet. My current task is to define the JavaMail session via JNDI contexts.


When setting the property er.javamail.sessionConfigViaJNDI=true  the container wasn't able to start correctly any more.  
I had to restart the tomcat in order to proceed :-(

It turned out, the ERJavaMail initialization stuck at

finishInitialization() -> initializeFrameworkFromSystemProperties() -> setDefaultSession(null)


My first step was to implement a lazy initialization of the ERJavaMail.defaultSession.

Now the app started, but the first attempt to send a mail results in the following exception:

.... - failed to send mail: javax.mail.Session cannot be cast to javax.mail.Session

WTF?

It turned out, that the javax.mail-1.6.0.jar was present in $CATALINA_HOME/lib _AND_ in MYApp/WEB-INF/lib
instead of being only in in $CATALINA_HOME/lib.


Even if placing the jars at the correct location fixes the root cause of not starting the container, I would opt for an
lazy initialisation of the defaultSession (see https://github.com/wocommunity/wonder/pull/960)


Regards

René




Best regards

René Bock

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