JavaMail无法显示html正文

Question

I am having trouble getting the SimpleClient sample app that comes with JavaMail, to work. Emails with plain text bodies display just fine in the viewer. But for html bodies it fails to find the appropriate content viewer. It's the line Object bean = dh.getBean(ci); at around line 205 in MessageViewer.getBodyComponent() , that results in bean getting assigned a null pointer, that causes the problem.

Earlier today I asked for help finding the source for javax.activation, hoping I could figure out the problem. But unfortunately when I step into that code, it goes to the wrong line in the source file, meaning I can't for the life of me figure out what is going wrong!

[I know nothing about Java Beans; this could be my problem. Please feel free to recommend that I do some learning about this technology :-) I haven't yet, for the simple reason that I have other things to do with my time. If, however, it's necessary, then I'll do it :-) ]

Has anyone else had this problem and how did you solve it?

Answer 1

The JavaBeans Activation Framework (JAF) has been included in the JDK since JDK 1.6. You can find the source code in the OpenJDK repository for recent versions.

When JAF was included in the JDK, none of the sample viewers were included. You can download the standalone JAF 1.1.1 release , which includes the sample viewers, and include it in your CLASSPATH.

And, just to be really clear, these are sample viewers, perhaps good enough for the JavaMail sample programs , but not good for much else. In particular, the text viewer displays all text as if it were plain text. You could get the same effect by changing the simple.mailcap file included with the SimpleClient to use "text/*".