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Andy Seaborne commented on JENA-597: ------------------------------------ Please try the attached patch (I don't have an IBM JRE to try it on). > 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: IBM Websphere 8 JRE > Reporter: Scott Patterson > Attachments: IRIResolverTest.java, JENA-597-1.patch > > > The following exception may occur 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:339) > at org.apache.jena.atlas.lib.cache.CacheLRU.get(CacheLRU.java:53) > at > org.apache.jena.riot.system.IRIResolver$IRIResolverNormal.resolveSilent(IRIResolver.java:427) > at > org.apache.jena.riot.system.IRIResolver$IRIResolverNormal.<init>(IRIResolver.java:383) > at org.apache.jena.riot.system.IRIResolver.create(IRIResolver.java:210) > 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.lang.LangRDFXML.<init>(LangRDFXML.java:104) > at org.apache.jena.riot.lang.LangRDFXML.create(LangRDFXML.java:74) > at org.apache.jena.riot.RiotReader.createParser(RiotReader.java:128) > at > org.apache.jena.riot.RDFParserRegistry$ReaderRIOTFactoryImpl$1.read(RDFParserRegistry.java:141) > at org.apache.jena.riot.RDFDataMgr.process(RDFDataMgr.java:818) > at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:258) > at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:244) > at > org.apache.jena.riot.adapters.RDFReaderRIOT.read(RDFReaderRIOT.java:69) > at com.ibm.team.jis.lqe.resource.RDFEntity.getModel(RDFEntity.java:361) > ... 39 more > This may be related to the problem reported that is suppose to be fixed by > the cloned issue. It looks to be the same stack trace. I've attached a test > to reproduce. Works with Oracle Oracle JRE 1.6.0.27 but not IBM jre. Keep > stopping and restarting the test until the NPE happens. NPE usually happens > right off the start. -- This message was sent by Atlassian JIRA (v6.1#6144)