Webapp会导致java.lang.ClassNotFoundException：javax.mail.Authenticator

我有tomcat6在Ubuntu上运行，用Java 1.6.0_20。

其中一个web应用程序导致一个错误，这有一个根本原因：

java.lang.ClassNotFoundException：javax.mail.Authenticator

mail.jar和activation.jar（在我的在线调查中发现这些是罪魁祸首）位于/ var / lib / tomcat6 / common / lib目录以及webapp的lib目录中。 javax.mail.Authenticator.class在mail.jar中。

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• htacces和子目录

还有什么我可以尝试使它工作？ 有没有日志可以帮助我find真正的错误？

更新：

• 删除重复的.jar文件以避免可能的冲突。 试着
• 运行tomcat（在另一台机器，Windows上的tomcat7）与详细的类加载：

[Loaded javax.mail.Address from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.mail.internet.InternetAddress from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.mail.Part from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.mail.BodyPart from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.mail.internet.MimePart from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.mail.internet.MimeBodyPart from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.mail.Multipart from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.mail.internet.MimeMultipart from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.activation.DataSource from C:\Program Files\Java\jdk1.6.0_26\jre\lib\rt.jar] [Loaded javax.mail.Message from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded javax.mail.internet.MimeMessage from file:/C:/.../build/web/WEB-INF/lib/mail.jar] [Loaded org.apache.naming.factory.MailSessionFactory from file:/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%207.0.11/lib/catalina.jar] [Loaded org.apache.naming.factory.MailSessionFactory$1 from file:/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%207.0.11/lib/catalina.jar] 28.07.2011 09:24:36 com.sun.faces.lifecycle.LifecycleImpl phase WARNUNG: executePhase(RENDER_RESPONSE 6,com.sun.faces.context.FacesContextImpl@698b41da) threw exception javax.faces.FacesException: [snip...] [...] Caused by: java.lang.ClassNotFoundException: javax.mail.Authenticator [...] 

所以这并没有告诉我任何新的东西。