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https://issues.apache.org/jira/browse/MIME4J-90?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662087#action_12662087
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Robert Burrell Donkin commented on MIME4J-90:
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I don't seem to have done a very good job of explaining the issue.
Using runtime exceptions make things difficult for correct protocol
implementations. Typically, protocols have their own in-protocol error
reporting systems. It is expected that exceptions will be checked so that
developers can caught and correctly handle all expected known issues. Runtime
exceptions are assumed to be fatal to the session and will typically result in
the socket disconnecting (for security reasons, it's unwise to continue after a
programming error).
These are public classes and form a public API. The runtime was replaced by a
checked exception to allow these classes to be safely used in protocol work in
a standalone fashion. Reverting this design decision is a potentially dangerous
decision since protocol implementations may be relying on the checked exception
to correctly handle that condition. Upgrading will break any protocols which
made this assumption.
When breaking the contract of a public API, it is better to do this in a
cleanly incompatible way. If this is not possible then it must be highlighted
in the release notes.
> Consistent parsing of header field names
> ----------------------------------------
>
> Key: MIME4J-90
> URL: https://issues.apache.org/jira/browse/MIME4J-90
> Project: JAMES Mime4j
> Issue Type: Bug
> Affects Versions: 0.5
> Reporter: Markus Wiederkehr
> Priority: Minor
> Fix For: 0.6
>
> Attachments: mime4j-fieldname.patch
>
>
> RFC 822 defines a field as:
> field = field-name ":" [ field-body ] CRLF
> field-name = 1*<any CHAR, excluding CTLs, SPACE, and ":">
> This implies that a field name must consist of at least one character and may
> not contain spaces or tabs; not even trailing ones.
> Currently o.a.j.mime4j.parser.AbstractEntity#parseField accepts empty field
> names while o.a.j.mime4j.field.Field#parse accepts trailing spaces and tabs.
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