The DataFlavor(String) based constructors used to default the class=<javaclass>
param to java.io.DataFlavor if none was specified. This default behavior is
very useful when constructing a simple DataFlavor for an external MIME
content type such as an e-mail attachment etc since such types typically
would not be a DataFlavor, and they would typically be represented as an
InputStream.

Unfortunately the javadoc clashed with the implementation, and someone
mindlessly changed the implementation to match the javadoc.

I believe that this fix is inappropriate.



tim.bell@Eng 1999-03-05
An easy way to demonstrate this bug is to use the msgsend.java
program in the javamail 1.1.1/demo directory:

1) cd <wherever>/javamail-1.1.1/demo
2) setenv CLASSPATH <wherever>/mail.jar:<wherever>/activation.jar:.
3) javac msgsend.java
4) java -Djava.compiler=NONE msgsend -s "BugId 4212613" -d user@host < /etc/motd

The output will be:


To: user@host
Subject: BugId 4212613
Exception in thread "main" java.lang.ExceptionInInitializerError: java.lang.IllegalArgumentException: no representation class specified for:text/plain
        at java.awt.datatransfer.DataFlavor.initialize(DataFlavor.java:335)
        at java.awt.datatransfer.DataFlavor.<init>(DataFlavor.java:250)
        at javax.activation.ActivationDataFlavor.<init>(ActivationDataFlavor.java:77)
        at com.sun.mail.handlers.text_plain.<clinit>(text_plain.java:33)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:124)
        at javax.activation.MailcapCommandMap.createDataContentHandler(MailcapCommandMap.java:368)
        at javax.activation.DataHandler.getDataContentHandler(DataHandler.java:617)
        at javax.activation.DataHandler.getInputStream(DataHandler.java:241)
        at javax.activation.DataHandlerDataSource.getInputStream(DataHandler.java:701)
        at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:99)
        at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:946)
        at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:1605)
        at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:1586)
        at javax.mail.Transport.send(Transport.java:72)
        at msgsend.<init>(msgsend.java:139)
        at msgsend.main(msgsend.java:29)

This was observed using build J:

% java -version ; java -fullversion
java version "1.2.1"
Classic VM (build JDK-1.2.1-J, green threads, sunwjit)
java full version "JDK-1.2.1-J"