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• Commented: (XERCESJ 589) Bug with pattern restriction on long strings
• : Xerces J 2 8 1 Release on Wednesday, September 13th
• : Xerces J 2 9 0 Release on Wednesday, November 22nd
• Commented: (XERCESJ 1066) Restriction+choice+substitutionGroup error
• Commented: (XERCESJ 1178) Error getting prefix for an attribute with no n
• Updated: (XERCESJ 1244) XMLSchemaValidator does not contribute element 's
• Some consideration about the xerces DOM implementation
• Updated: (XERCESJ 1066) Restriction+choice+substitutionGroup error
• Commented: (XERCESJ 1227) Poor performance / OutOfMemoryError for sequenc
• retain exception stack traces
• Updated: (XERCESJ 1193) NPE or hang when parsing using the "continue afte
• Future of NekoHTML
• Commented: (XERCESJ 1203) NPE in XMLDTDProcessor
• DOM Level 3 APIs for Xalan J and a new Xalan release (2 7 1)
• : xml commons external 1 3 04 Release on Wednesday, November 22nd
• Commented: (XERCESJ 1247) Incorrect location information on SAX when usin
• XInclude exceptions how to mirror Xerces J functionality into Xerces C++?
• First proposal on SoC project "Add support for the StAX (JSR 173) cursor API
• : xml commons resolver 1 2 Release on Wednesday, November 22nd
• Typo in RangeToken java Please check
• Validator features
• java lang ClassCastException when adopting Node
• using the org apache xerces impl xs identity package
• Updated: (XERCESJ 1257) buffer overflow in UTF8Reader for characters out
• Problem with ref attributes and schema validation
• Updated: (XERCESJ 122) XMLSchemaValidator does not contribute element 's d
• Performance problem under load Xerces with Weblogic 9 x
• remove ignored memory allocation
• Commented: (XERCESJ 1177) SAXXMLStreamReader doesn 't always report namesp
• Commented: (XERCESJ 977) Null pointer exception during DOM parsing
• Commented: (XERCESJ 1197) Code cleanup for org apache xml serialize
• Commented: (XERCESJ 1201) Initial contribution for StAX Event API
• Updated: (XERCESJ 1061) Regex "$ " and "^ " characters treated as special c
• Commented: (XERCESJ 1199) SAXXMLStreamReader should attempt to register a
• Commented: (XERCESJ 1061) Regex "$ " and "^ " characters treated as special
• Updated: (XERCESJ 589) Bug with pattern restriction on long strings
• StackOverflow
• xerces Range unnecessarily not garbage collectable if not detached
• Updated: (XERCESJ 1178) Error getting prefix for an attribute with no nam
• Bug in xs:redefine
• Commented: (XERCESJ 1204) Can not set XMLEntityResolver for LSParser
• Updated: (XERCESJ 1253) Prototype for SoC2007 project "Add support for th
• Updated: (XERCESJ 1259) Add SteamFilter Function to SoC2007 project "Add
• Assigned: (XERCESJ 444) SAXException thrown by EntityResolver is reported
• Google Summer of Code 2007
• Xerces J and XInclude relative path issue
• Assigned: (XERCESJ 206) Stack overflow when using a schema validation
• Commented: (XERCESJ 1215) Restrictions involving two levels of substituti
• Closed: (XERCESJ 1203) NPE in XMLDTDProcessor
• non overriding equals methoda
• Resolved: (XERCESJ 1079) invalid value returned for TOTALDIGITS facet in
• Xerces AS3 port
• Updated: (XERCESJ 325) Regular Expression; Pattern "| " clause order de
• Updated: (XERCESJ 1196) Javadoc generation fails on Java SE 5 0
• Closed: (XERCESJ 1202) DTD validation on XIncluded documents when the sch
• Created: (XERCESJ 1124) Nonspecific schema error message
• a bug in xerces
• Updated: (XERCESJ 1201) Initial contribution for StAX Event API
• Closed: (XERCESJ 1254) Empty uris in targetNamespace attribute not report
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Commented: (XERCESJ-1227) Poor performance / OutOfMemoryError for sequenc

Commented: (XERCESJ-1227) Poor performance / OutOfMemoryError for sequenc

2007-02-26       - By Christopher Sahnwaldt (JIRA)
Reply:     1     2     3     4  


   [ https://issues.apache.org/jira/browse/XERCESJ-1227?page=com.atlassian
.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12475866 ]

Christopher Sahnwaldt commented on XERCESJ-1227:
------------------------------------------------

A while ago, I rewrote org.apache.xerces.impl.dtd.models.CMStateSet.java as a
sparse array and achieved a speedup factor between 10 and 20 for our problem
with maxOccurs="999". I hope I will find the time to clean up the code and
submit a patch in the next few days.

> Poor performance / OutOfMemoryError for sequences, choices and nested with
large minOccurs/maxOccurs
> -----------------------------------------------------------------------------
-----------------------
>
>                 Key: XERCESJ-1227
>                 URL: https://issues.apache.org/jira/browse/XERCESJ-1227
>             Project: Xerces2-J
>          Issue Type: Bug
>          Components: XML Schema Structures
>    Affects Versions: 2.9.0
>            Reporter: Michael Glavassevich
>            Priority: Minor
>
> We now handle large minOccurs/maxOccurs on element/wildcard particles more
gracefully by creating a compact representation in the DFA and using counters
to check the occurence constraints, however we will still fully expand the
content model for minOccurs/maxOccurs on sequences and choices which could
still lead to an OutOfMemoryError or very poor performance (i.e. could still
take several minutes to build the DFA).  Sequences, choices and nested
minOccurs/maxOccurs are somewhat tricker to handle. We would need a more
general solution than the one implemented for elements and wildcards to improve
those.

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