You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@jena.apache.org by "Simon Helsen (JIRA)" <ji...@apache.org> on 2013/06/05 21:00:21 UTC
[jira] [Updated] (JENA-467) IRIResolverNormal should use
synchronized CacheLRU
[ https://issues.apache.org/jira/browse/JENA-467?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Simon Helsen updated JENA-467:
------------------------------
Attachment: patch.txt
> IRIResolverNormal should use synchronized CacheLRU
> --------------------------------------------------
>
> Key: JENA-467
> URL: https://issues.apache.org/jira/browse/JENA-467
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 2.10.1
> Environment: Any IBM JRE 6 or higher
> Reporter: Simon Helsen
> Priority: Critical
> Attachments: patch.txt
>
>
> The following exception may occur on an IBM JRE 6 or higher when more than one thread requires access to the org.apache.jena.atlas.lib.cache.CacheLRU embedded in IRIResolverNormal:
> Caused by: java.lang.NullPointerException
> at java.util.LinkedHashMap.get(LinkedHashMap.java:337)
> at org.apache.jena.atlas.lib.cache.CacheLRU.get(CacheLRU.java:53)
> at org.apache.jena.riot.system.IRIResolver$IRIResolverNormal.resolveSilent(IRIResolver.java:403)
> at org.apache.jena.riot.system.IRIResolver$IRIResolverNormal.<init>(IRIResolver.java:359)
> at org.apache.jena.riot.system.IRIResolver.create(IRIResolver.java:212)
> at org.apache.jena.riot.system.RiotLib.profile(RiotLib.java:141)
> at org.apache.jena.riot.system.RiotLib.profile(RiotLib.java:130)
> at org.apache.jena.riot.system.RiotLib.profile(RiotLib.java:117)
> at org.apache.jena.riot.RiotReader.createParserTurtle(RiotReader.java:310)
> at org.apache.jena.riot.RiotReader.createParser(RiotReader.java:142)
> at org.apache.jena.riot.RiotReader.createParser(RiotReader.java:133)
> at org.apache.jena.riot.RDFParserRegistry$ReaderRIOTFactoryImpl$1.read(RDFParserRegistry.java:141)
> at org.apache.jena.riot.RDFDataMgr.process(RDFDataMgr.java:760)
> at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:258)
> at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:244)
> ... 20 more
> The problem seems to only occurs on IBM JRE 6 or higher as its implementation of LinkedHashMap is not thread safe. Note that the JDK specification does not required LinkedHashMap to be thread safe.
> The solution is to make use of CacheFactory.createSync when creating the Cache in the IRIResolverNormal. Patch attached
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira