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https://issues.apache.org/jira/browse/DAFFODIL-2755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17642549#comment-17642549
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Mike Beckerle commented on DAFFODIL-2755:
-----------------------------------------
Is there a way to set this minSize for infoset walker to zero programatically
or via tuning for testing purposes? Seems useful as a special test mode.
> infoset nodes removed by InfosetWalker tha are still needed, null pointer
> exception
> -----------------------------------------------------------------------------------
>
> Key: DAFFODIL-2755
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2755
> Project: Daffodil
> Issue Type: Bug
> Components: Back End
> Affects Versions: 3.4.0
> Reporter: Steve Lawrence
> Priority: Major
>
> Functions in SequenceChildParseResultHelper.scala and
> SeparatedSequenceChildParseResultHelper.scala call the
> maybeMostRecentlyAddedChild() function, which has a purpose of getting the
> child that was most recently added to the infoset and inspecting it element
> to determine things nil/normal/missing representation and determine the parse
> status. This seems to usually be used when dealing with postfix separators,
> but there may be other cases and more specific circumstances needed.
> However, in some cases it is possible that the InfosetWalker has already
> walked and remove elements from the Infoset because it thinks they aren't
> needed anymore. But this function does actually still need them, which can
> lead to null exceptions.
> Fortunately, the InfosetWalker only removes infoset elements periodically
> depending on a number of factors, so it's fairly rare that this case actually
> happens. But when it does it appears very random. To reliably cause the
> issue, we can force the infoset walker to remove elements as soon as it
> thinks it's possible by setting the InfosetWalker minSkip value to zero.
> After doing that, the below schema and data reliably reproduce the issue.
> Data:
> {code}
> |classificiation;body1;body1;body3;|
> {code}
> Schema:
> {code:xml}
> <?xml version="1.0" encoding="UTF-8"?>
> <schema
> xmlns="http://www.w3.org/2001/XMLSchema";
> xmlns:xs="http://www.w3.org/2001/XMLSchema";
> xmlns:dfdl="http://www.ogf.org/dfdl/dfdl-1.0/";>
> <include
> schemaLocation="org/apache/daffodil/xsd/DFDLGeneralFormat.dfdl.xsd" />
> <annotation>
> <appinfo source="http://www.ogf.org/dfdl/";>
> <dfdl:format xmlns="" ref="GeneralFormat" lengthKind="delimited" />
> </appinfo>
> </annotation>
> <element name="file">
> <complexType>
> <sequence dfdl:initiator="|" dfdl:terminator="|" dfdl:separator=";">
> <element name="first" type="xs:string" />
> <sequence dfdl:separator=";" dfdl:separatorPosition="postfix">
> <element name="field" type="xs:string" minOccurs="0"
> maxOccurs="unbounded" />
> </sequence>
> </sequence>
> </complexType>
> </element>
> </schema>
> {code}
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