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https://issues.apache.org/jira/browse/LUCENE-7727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898771#comment-15898771
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David Smiley commented on LUCENE-7727:
--------------------------------------
Thanks for the tips Uwe. I forgot to mention I _did_ run {{ant
ivy-bootstrap}}. So the problem was that my {{~/.ant/lib/}} had _both_
ivy-2.2.0.jar and ivy-2.3.0.jar somehow for who knows how long, and this is
biting me now. Perhaps Java 9 might better alert users to classpaths
containing jars with classes in the same package? Something to look forward to
if so.
> Replace EOL'ed pegdown by flexmark-java for Java 9 compatibility
> ----------------------------------------------------------------
>
> Key: LUCENE-7727
> URL: https://issues.apache.org/jira/browse/LUCENE-7727
> Project: Lucene - Core
> Issue Type: Improvement
> Components: general/build
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Labels: Java9
> Fix For: master (7.0), 6.5
>
> Attachments: LUCENE-7727.patch, LUCENE-7727.patch
>
>
> The documentation tasks use a library called "pegdown" to convert Markdown to
> HTML. Unfortunately, the developer of pegdown EOLed it and points the users
> to a faster replacement: flexmark-java
> (https://github.com/vsch/flexmark-java).
> This would not be important for us, if pegdown would work with Java 9, but it
> is also affected by the usual "setAccessible into private Java APIs" issue
> (see my talk at FOSDEM:
> https://fosdem.org/2017/schedule/event/jigsaw_challenges/).
> The migration should not be too hard, its just a bit of Groovy Code rewriting
> and dependency changes.
> This is the pegdown problem:
> {noformat}
> Caused by: java.lang.RuntimeException: Could not determine whether class
> 'org.pegdown.Parser$$parboiled' has already been loaded
> at org.parboiled.transform.AsmUtils.findLoadedClass(AsmUtils.java:213)
> at
> org.parboiled.transform.ParserTransformer.transformParser(ParserTransformer.java:35)
> at org.parboiled.Parboiled.createParser(Parboiled.java:54)
> ... 50 more
> Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make
> protected final java.lang.Class
> java.lang.ClassLoader.findLoadedClass(java.lang.String) accessible: module
> java.base does not "opens java.lang" to unnamed module @551b6736
> at
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:335)
> at
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:278)
> at
> java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:196)
> at java.base/java.lang.reflect.Method.setAccessible(Method.java:190)
> at org.parboiled.transform.AsmUtils.findLoadedClass(AsmUtils.java:206)
> ... 52 more
> {noformat}
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