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Editorial Team
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Asked: 2026-05-31T10:07:35+00:00

I am trying to send mail in my web application. I am using the

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I am trying to send mail in my web application. I am using the libraries javax.mail-1.4.4 and activation-1.1. My configuration is set up like described in the Tomcat Docs here http://tomcat.apache.org/tomcat-5.5-doc/jndi-resources-howto.html#JavaMail_Sessions

The web.xml file is configured properly according to this information. The context.xml where I store the settings is configured properly as well (or at least should be) with mail.*, auth, name, type info set properly.

When trying to send a mail this way, I get the following error:

Exception in thread "Thread-27" java.lang.NoClassDefFoundError: javax/mail/Authenticator

in this line:

session = (Session) envCtx.lookup("mail/Session");

I’ve looked through some solutions, like missing mail/activation libraries, checked up on those but none I could find were able to help me. Any idea what I could do to fix this or get in closer on the error?

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1 Answer

  1. Editorial Team

    “should be” is the operative phrase. I’d recommend that you believe Tomcat when it tells you it’s missing things. You have not configured things properly until Tomcat says you have.

    I’d recommend that you put them into the Tomcat /lib folder and see if that makes a difference.

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