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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