DataFlavor is throwing an exception in a situation where it never did before.
This is breaking the JavaBeans Activation Framework Standard Extension.

datsun$ cat df.java
import java.awt.datatransfer.*;

public class df {
    public static void main(String[] argv) throws Exception {
        new DataFlavor("text/plain", "Plain Text");
    }
}
datsun$ javac df.java
datsun$ java df
Exception in thread "main" java.lang.IllegalArgumentException: no representation class specified for:text/plain
        at java.awt.datatransfer.DataFlavor.initialize(DataFlavor.java, Compiled Code)
        at java.awt.datatransfer.DataFlavor.<init>(DataFlavor.java, Compiled Code)
        at df.main(df.java, Compiled Code)
datsun$ java -version
java version "1.2.1"
Classic VM (build JDK-1.2.1-I, green threads, sunwjit)