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https://issues.apache.org/jira/browse/CASSANDRA-20992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18034161#comment-18034161
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Brandon Williams commented on CASSANDRA-20992:
----------------------------------------------
+1 if CI looks good
> Fix ExceptionsTable when stacktrace has zero elements
> -----------------------------------------------------
>
> Key: CASSANDRA-20992
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20992
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Feature/Virtual Tables
> Reporter: Stefan Miklosovic
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 5.1
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I saw this in one of pre-ci runs:
> {code}
> 02:01:57 [junit-timeout] ERROR [Reconcile:2] <main> 2025-10-30T02:01:57,672
> ExecutionFailure.java:77 - Unexpected error while handling unexpected error
> 02:01:57 [junit-timeout] java.lang.IndexOutOfBoundsException: Index 0 out of
> bounds for length 0
> 02:01:57 [junit-timeout] at
> java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
> 02:01:57 [junit-timeout] at
> java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
> 02:01:57 [junit-timeout] at
> java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
> 02:01:57 [junit-timeout] at
> java.base/java.util.Objects.checkIndex(Objects.java:374)
> 02:01:57 [junit-timeout] at
> java.base/java.util.ArrayList.get(ArrayList.java:459)
> 02:01:57 [junit-timeout] at
> org.apache.cassandra.db.virtual.ExceptionsTable.persist(ExceptionsTable.java:182)
> 02:01:57 [junit-timeout] at
> org.apache.cassandra.utils.JVMStabilityInspector.uncaughtException(JVMStabilityInspector.java:74)
> 02:01:57 [junit-timeout] at
> org.apache.cassandra.concurrent.ExecutionFailure.handle(ExecutionFailure.java:72)
> 02:01:57 [junit-timeout] at
> org.apache.cassandra.concurrent.ExecutionFailure$1.run(ExecutionFailure.java:142)
> 02:01:57 [junit-timeout] at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> 02:01:57 [junit-timeout] at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> 02:01:57 [junit-timeout] at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> {code}
> That is because we do "stackTrace.get(0)" in
> ExceptionsTable.persist(Throwable) and there is wrong assumption that
> stacktrace will always have some elements but it might be actually also empty.
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