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https://issues.apache.org/jira/browse/MIME4J-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773397#action_12773397
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Andrzej Rusin commented on MIME4J-139:
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@Markus: my friend had very similar problems on JRE 6 Update 16 when he was
creating our custom Handlers and Fields.
My target env is still .11, so even if I upgrade on local and it helps, the
problem will persist in the target env.
@Stefano: I think you are right.
Another hint which may or may not be helpful: I am running on local from inside
Eclipse, so it may or may not be a classloader problem.
But, if only the fields staticness is consistent, the problem disappears.
> 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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