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From "Rickard Ekeroth (JIRA)" <mime4j-...@james.apache.org>
Subject [jira] [Created] (MIME4J-200) Uninitialized Static Parser Fields Causes Class Cast & Null Pointer Exceptions
Date Thu, 07 Jul 2011 15:09:16 GMT
Uninitialized Static Parser Fields Causes Class Cast & Null Pointer Exceptions
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                 Key: MIME4J-200
                 URL: https://issues.apache.org/jira/browse/MIME4J-200
             Project: JAMES Mime4j
          Issue Type: Bug
          Components: parser (core)
    Affects Versions: 0.6.1
         Environment: Linux & Windows in Java 
            Reporter: Rickard Ekeroth


The main problem is that e.g. the class ContentTypeField contains a static variable called
'PARSER' which is used by the class DefaultFieldParser. An instance of DefaultFieldParser
is created and stored in a static variable in the class AbstractField. The class AbstractField
is the base class of the class ContentTypeField. The effect of this is that under certain
circumstances (since the static initialization in the base class happens first) the static
variable 'PARSER' will be null (not yet initialized) when the class created in the base class
reads the value of it.

The above description is valid for all the different field classes that have a static 'PARSER'
variable in them.

This does not always manifest itself since it seems that in certain combinations of Java versions
and/or operating systems the static variable initialization in the same inheritance hierarchy
works differently.

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