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Posted to dev@jena.apache.org by "Scott Patterson (JIRA)" <ji...@apache.org> on 2013/11/26 20:12:35 UTC
[jira] [Updated] (JENA-597) IRIResolverNormal needs thread safe
CacheLRU
[ https://issues.apache.org/jira/browse/JENA-597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Scott Patterson updated JENA-597:
---------------------------------
Fix Version/s: (was: Jena 2.11.0)
> IRIResolverNormal needs thread safe CacheLRU
> --------------------------------------------
>
> Key: JENA-597
> URL: https://issues.apache.org/jira/browse/JENA-597
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 2.11.0
> Environment: Any IBM JRE 6 or higher
> Reporter: Scott Patterson
> Assignee: Andy Seaborne
>
> 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
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