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https://issues.apache.org/jira/browse/MIME4J-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773083#action_12773083
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Markus Wiederkehr commented on MIME4J-139:
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I think it should not be a problem to make defaultParser a static final member
of DelegatingFieldParser. After all it gets initialized with
UnstructuredField.PARSER which is a static final variable itself..
But it would still be good to understand how and why the problem occurs. I
simply don't see how the local variable 'parser' can ever be null in
DelegatingFieldParser line 51. Method getParser() is not overwritten and
defaultParser does not seem to get modified anywhere.
Any ideas anyone?
> DelegatingFieldParser NPE problem
> ---------------------------------
>
> Key: MIME4J-139
> URL: https://issues.apache.org/jira/browse/MIME4J-139
> Project: JAMES Mime4j
> Issue Type: Bug
> Affects Versions: 0.6
> Environment: jre 1.6.11
> Reporter: Andrzej Rusin
> Priority: Minor
> Original Estimate: 0.08h
> Remaining Estimate: 0.08h
>
> We have custom ContentHandlers that extend AbstractContentHandler and add
> some custom Fields that extend AbstractField.
> We were getting:
> java.lang.NullPointerException
> at
> org.apache.james.mime4j.field.DelegatingFieldParser.parse(DelegatingFieldParser.java:51)
> at org.apache.james.mime4j.field.AbstractField.parse(AbstractField.java:171)
> at org.apache.james.mime4j.field.AbstractField.parse(AbstractField.java:63)
> at
> org.apache.james.mime4j.message.MessageBuilder.field(MessageBuilder.java:101)
> at
> org.apache.james.mime4j.parser.MimeStreamParser.parse(MimeStreamParser.java:121)
> at org.apache.james.mime4j.message.Message.<init>(Message.java:141)
> at org.apache.james.mime4j.message.Message.<init>(Message.java:100)
> always AFTER the MimeStreamParser got invoked with our content handlers (so,
> not on our parsing, but eg. later, on normal
> new Message(InputStream).
> Looked like we are currupting something inside MimeStreamParser.
> Then I noticed that DelegatingFieldParser.defaultParser is defined as:
> private FieldParser defaultParser = UnstructuredField.PARSER;
> while other field parsers have:
> static final FieldParser PARSER = new FieldParser() {...}
> So I changed DelegatingFieldParser.defaultParser to static final and the
> NPEs do not occur anymore.
> I do not undestand exactly why this happens, but that are the facts.
> Is there any reason why DelegatingFieldParser.defaultParser can't be static
> final?
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