java.io.UnsupportedEncodingException: cp932?

java.io.UnsupportedEncodingException: cp932?

What type of content would cause this exception?
Caused by: java.io.UnsupportedEncodingException: cp932
at
sun.nio.cs.StreamDecoder.forInputStreamReader(StreamDecoder.java:71)
at java.io.InputStreamReader.<init>(InputStreamReader.java:100)
at
com.google.code.com.sun.mail.handlers.text_plain.getContent(text_plain.java:109)
at
com.google.code.javax.activation.DataSourceDataContentHandler.getContent(DataHandler.java:803)
at
com.google.code.javax.activation.DataHandler.getContent(DataHandler.java:550)
at
com.google.code.javax.mail.internet.MimeBodyPart.getContent(MimeBodyPart.java:639)
Any why can't OpenJDK handle this encoding?