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From "Markus Wiederkehr (JIRA)" <mime4j-...@james.apache.org>
Subject [jira] Commented: (MIME4J-139) DelegatingFieldParser NPE problem
Date Tue, 03 Nov 2009 15:11:59 GMT

    [ https://issues.apache.org/jira/browse/MIME4J-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773083#action_12773083

Markus Wiederkehr commented on MIME4J-139:

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

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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