[jira] [Created] (MIME4J-270) MultipartBuilder creates message with null subtype

["Dmitry Katsubo (JIRA)" <mi...@james.apache.org>]

Dmitry Katsubo created MIME4J-270:
-------------------------------------

             Summary: MultipartBuilder creates message with null subtype
                 Key: MIME4J-270
                 URL: https://issues.apache.org/jira/browse/MIME4J-270
             Project: James Mime4j
          Issue Type: Improvement
          Components: dom
    Affects Versions: 0.8.1
            Reporter: Dmitry Katsubo


JavaDoc of [{{MultipartBuilder#getSubType()}}|https://github.com/apache/james-mime4j/blob/6c31bd1e8f8b97cc432bbf9580e7383f00de1506/dom/src/main/java/org/apache/james/mime4j/message/MultipartBuilder.java#L75] reads:
{quote}
Gets the multipart sub-type. E.g. {{alternative}} (the default) or {{parallel}}.
{quote}
however builder creates 
{code}
Multipart multipart = MultipartBuilder.create().build();
new DefaultMessageWriter().writeMessage(multipart, System.out);
{code}
outputs:
{code}
MIME-Version: 1.0
Content-Type: multipart/null; boundary="-=Part.0.c3f59e98561a68df.16251ed82a4.feee6e1cf64afde8=-"
{code}
Expected that builder is initialized with some default subtype.



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