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https://issues.apache.org/jira/browse/JAMES-3176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17105959#comment-17105959
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Benoit Tellier commented on JAMES-3176:
---------------------------------------
https://github.com/linagora/james-project/pull/3366 contributes the singleton.
However, maybe that's more likely to be due to an incompatible version of the
asm library from an other dependency.
As expressed here
https://github.com/linagora/james-project/pull/3366#issuecomment-627187285
{code:java}
[INFO] | +-
com.datastax.cassandra:cassandra-driver-core:jar:shaded:3.7.2:compile
[INFO] | | +- io.dropwizard.metrics:metrics-core:jar:4.1.0:compile
[INFO] | | +- com.github.jnr:jnr-ffi:jar:2.1.7:compile
[INFO] | | | +- com.github.jnr:jffi:jar:1.2.16:compile
[INFO] | | | +- com.github.jnr:jffi:jar:native:1.2.16:runtime
[INFO] | | | +- org.ow2.asm:asm:jar:5.0.3:compile
{code}
VS parboiled relying on org.ow2.asm:asm:jar:7.1:compile
The solution that should fix this is proposed here:
https://github.com/linagora/james-project/pull/3366#issuecomment-627733955
We should implement MDN parsing using parboiled-scala that do not depends on
ASM libraries.
> MDN parser instantiation via parboiled fails
> --------------------------------------------
>
> Key: JAMES-3176
> URL: https://issues.apache.org/jira/browse/JAMES-3176
> Project: James Server
> Issue Type: Improvement
> Components: Mailet Contributions, mdn
> Affects Versions: 3.5.0
> Reporter: Benoit Tellier
> Priority: Major
> Labels: bug
> Fix For: 3.6.0
>
>
> Upon execution of ExtractMDNOriginalJMAPMessageId & Vacation mailet we
> encounter the following exceptions:
> {code:java}
> java.lang.RuntimeException: Error creating extended parser class: null
> at org.parboiled.Parboiled.createParser(Parboiled.java:58)
> at org.apache.james.mdn.MDNReportParser.parse(MDNReportParser.java:57)
> at org.apache.james.mdn.MDNReportParser.parse(MDNReportParser.java:53)
> at
> org.apache.james.jmap.mailet.ExtractMDNOriginalJMAPMessageId.parseReport(ExtractMDNOriginalJMAPMessageId.java:120)
> [...]
> Caused by: java.lang.IllegalArgumentException: null
> at org.objectweb.asm.ClassVisitor.<init>(Unknown Source)
> at org.objectweb.asm.ClassVisitor.<init>(Unknown Source)
> at org.objectweb.asm.tree.ClassNode.<init>(Unknown Source)
> at
> org.parboiled.transform.ParserClassNode.<init>(ParserClassNode.java:43)
> at
> org.parboiled.transform.ParserTransformer.extendParserClass(ParserTransformer.java:43)
> at
> org.parboiled.transform.ParserTransformer.transformParser(ParserTransformer.java:39)
> at org.parboiled.Parboiled.createParser(Parboiled.java:54)
> {code}
> Code inspection did not allow me to identify the route cause of the failure
> due to some heavy reflection dark magic taking place.
> However instantiation of the parser was performed via reflection upon each MDN
> parsing.
> Given that a parser only defines a set of rules, and is thus immutable,
> we can turn it into a constant, effectively solving our problem ?
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