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https://issues.apache.org/jira/browse/CAMEL-11609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16104683#comment-16104683
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Önder Sezgin commented on CAMEL-11609:
--------------------------------------
if you sync read access, i guess there is potential performance issue and your
threading will possibly degrade.
maybe there is CopyOnWriteXXX collection or such specific implementation may be
needed..
> camel-univocity-parsers: marshaller not thread safe
> ---------------------------------------------------
>
> Key: CAMEL-11609
> URL: https://issues.apache.org/jira/browse/CAMEL-11609
> Project: Camel
> Issue Type: Bug
> Components: camel-csv
> Affects Versions: 2.19.1
> Reporter: Daniel Baldes
> Assignee: Önder Sezgin
> Fix For: 2.20.0
>
>
> org.apache.camel.dataformat.univocity.Marshaller.java is not thread safe.
> When this.adaptheaders is true, this.headers is modified in the wirteRow()
> method. This can lead to ConcurrentModificationExceptions (see below) and
> jumbled headers, occasionally.
> I use a {{UnivocityCsvDataFormat}} for marshalling CSV in a route which is
> called in parallel. The DataFormat creates a Marshaller with adaptheaders ==
> true when headers are not specified in the format.
> {code}java.util.ConcurrentModificationException: null
> at
> java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:719)
> at
> java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:742)
> at
> org.apache.camel.dataformat.univocity.Marshaller.writeRow(Marshaller.java:95)
> at
> org.apache.camel.dataformat.univocity.Marshaller.marshal(Marshaller.java:67)
> at
> org.apache.camel.dataformat.univocity.AbstractUniVocityDataFormat.marshal(AbstractUniVocityDataFormat.java:94)
> at
> org.apache.camel.processor.MarshalProcessor.process(MarshalProcessor.java:69)
> at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
> at
> org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:541)
> at
> org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:198)
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:120)
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:83)
> at
> org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:198)
> at
> org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:62)
> at
> org.apache.camel.processor.SendDynamicProcessor$1.doInAsyncProducer(SendDynamicProcessor.java:124)
> at
> org.apache.camel.impl.ProducerCache.doInAsyncProducer(ProducerCache.java:436)
> at
> org.apache.camel.processor.SendDynamicProcessor.process(SendDynamicProcessor.java:119)
> at
> org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:541)
> at
> org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:198)
> at
> org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:97)
> at
> org.apache.camel.processor.WireTapProcessor$1.call(WireTapProcessor.java:137)
> at
> org.apache.camel.processor.WireTapProcessor$1.call(WireTapProcessor.java:133)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748)
> {code}
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