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From Dain Sundstrom <>
Subject javamail problems
Date Thu, 26 Oct 2006 00:07:25 GMT
I have been hacking on JavaMail lately and have run into difficulty  
overriding the JavaMail SMTP implementation.  In the great wisdom of  
Sun Microsystems, the only way to add a new protocol provider to the  
JavaMail implementation is have the implementation discover it via a  
META-INF/javamail.providers or META-INF/javamail.default.providers in  
the class loader.  Once your provider has been discovered, you can  
get it instantiated by either making it the default provider defined  
by the first META-INF/javamail.default.providers found in the class  
loader, programatically selecting the provider with  
session.getProviders() and session.setProvider(provider), or by  
passing in the mail.smtp.class=your.SMTPClass to the  
Session.getInstance(properties) method.  The third option seems  
really cool but the class you specify must be mentioned in a META-INF  
providers file otherwise the property is silently ignored.

I'd like to propose a couple of changes for the next release after  
1.2 which should make JavaMail (and some other lame specs) easier to  

1) Add the ability to declare additional dependencies to the  
configuration via the config.xml file.  We probably want a way to  
exclude a dependency and maybe add to the front of the dependency  
list (unless remove re-add works).  This is required to add a new  
provider to the existing javamail configuration.  Without this, you  
must update every application to point to a new configuration that  
contains your provider jar.

2) Add a "className" attribute to  
org.apache.geronimo.mail.ProtocolGBean and all subclasses.  If this  
is set then, in addOverrides, we add a mail.${protocol}.class=$ 
{className} to the properties object.  There is no reason to add this  
until item 1 is complete, since you can't extend the class path, and  
would be very confusing to users.

What do you think?


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