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https://issues.apache.org/jira/browse/LUCENE-10431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500118#comment-17500118
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Alan Woodward commented on LUCENE-10431:
----------------------------------------
I opened [https://github.com/apache/lucene/pull/722]
> could this be backported to 8.x too?
I don't think we have any plans for further 8.x releases at the moment, but I
can merge it back as a bug fix that would be included if we changed our minds
or found a security problem.
> AssertionError in BooleanQuery.hashCode()
> -----------------------------------------
>
> Key: LUCENE-10431
> URL: https://issues.apache.org/jira/browse/LUCENE-10431
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 8.11.1
> Reporter: Michael Bien
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Hello devs,
> the constructor of BooleanQuery can under some circumstances trigger a hash
> code computation before "clauseSets" is fully filled. Since BooleanClause is
> using its query field for the hash code too, it can happen that the "wrong"
> hash code is stored, since adding the clause to the set triggers its
> hashCode().
> If assertions are enabled the check in BooleanQuery, which recomputes the
> hash code, will notice it and throw an error.
> exception:
> {code:java}
> java.lang.AssertionError
> at org.apache.lucene.search.BooleanQuery.hashCode(BooleanQuery.java:614)
> at java.base/java.util.Objects.hashCode(Objects.java:103)
> at java.base/java.util.HashMap$Node.hashCode(HashMap.java:298)
> at java.base/java.util.AbstractMap.hashCode(AbstractMap.java:527)
> at org.apache.lucene.search.Multiset.hashCode(Multiset.java:119)
> at java.base/java.util.EnumMap.entryHashCode(EnumMap.java:717)
> at java.base/java.util.EnumMap.hashCode(EnumMap.java:709)
> at java.base/java.util.Arrays.hashCode(Arrays.java:4498)
> at java.base/java.util.Objects.hash(Objects.java:133)
> at
> org.apache.lucene.search.BooleanQuery.computeHashCode(BooleanQuery.java:597)
> at org.apache.lucene.search.BooleanQuery.hashCode(BooleanQuery.java:611)
> at java.base/java.util.HashMap.hash(HashMap.java:340)
> at java.base/java.util.HashMap.put(HashMap.java:612)
> at org.apache.lucene.search.Multiset.add(Multiset.java:82)
> at org.apache.lucene.search.BooleanQuery.<init>(BooleanQuery.java:154)
> at org.apache.lucene.search.BooleanQuery.<init>(BooleanQuery.java:42)
> at
> org.apache.lucene.search.BooleanQuery$Builder.build(BooleanQuery.java:133)
> {code}
> I noticed this while trying to upgrade the NetBeans maven indexer modules
> from lucene 5.x to 8.x https://github.com/apache/netbeans/pull/3558
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