Stefan Miklosovic created CASSANDRA-20992:
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Summary: 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
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 a wrong assumption that stacktrace will always have some elements
but it might be actually also empty.
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