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https://issues.apache.org/jira/browse/LUCENE-9912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17316347#comment-17316347
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Uwe Schindler commented on LUCENE-9912:
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I was able to fix / work around the NPE problem in javac and I also fixed some
javadoc problems in branch_8x. It now works with JDK 17.
I filed the following bug report at OpenJDK:
https://bugs.openjdk.java.net/browse/JDK-8264843
> Disable HTML doclint in Lucene/Solr 8
> -------------------------------------
>
> Key: LUCENE-9912
> URL: https://issues.apache.org/jira/browse/LUCENE-9912
> Project: Lucene - Core
> Issue Type: Task
> Components: general/build
> Affects Versions: 8.x, 8.8.1
> Environment: openjdk version "17-ea" 2021-09-14
> OpenJDK Runtime Environment (build 17-ea+16-1315)
> OpenJDK 64-Bit Server VM (build 17-ea+16-1315, mixed mode, sharing)
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Blocker
> Labels: Java17
> Fix For: 8.x, 8.8.2
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Due to LUCENE-9209 we fixed most of the Javadocs in Lucene / Solr master/main.
> But we did not do that in Lucene 8. Unfortunetaly later Java versions (JDK
> 17) now fail to compile or run javadoc, because the later java versions apply
> very strict HTML5 checks.
> The main problem again is thet we unconditinally enable {{-Werror}} at the
> same time with {{-Xdoclint:all}} (as said hundreds of times by me, we should
> really only enable warnings we know of!).
> To allow compilation with JDK-17 or later I will remove the HTML warnings
> from the config
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