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https://issues.apache.org/jira/browse/CASSANDRA-19545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17864386#comment-17864386
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Michael Semb Wever commented on CASSANDRA-19545:
------------------------------------------------
This problem can easily be avoided by using the in-tree scripts instead.
For example:
{code}
.build/run-tests.sh jvm-dtest-upgrade CompactStorageColumnDeleteTest
{code}
(or its docker version: {{`.build/run-tests.sh jvm-dtest-upgrade
CompactStorageColumnDeleteTest 11`}})
I'm still inclined to enforce that all jar files for all expected versions are
in place. i.e. provide an informative fail-fast message.
> Null pointer when running Upgrade Tests
> ---------------------------------------
>
> Key: CASSANDRA-19545
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19545
> Project: Cassandra
> Issue Type: Bug
> Components: Test/dtest/java
> Reporter: ConfX
> Priority: Normal
>
> h2. What happened
> The `UpgradeTestBase.java` may throw null pointer exception when creating the
> version upgrade pairs in `upgradesTo()` method.
> The problem happens in the for loop shown below. The `upgradesTo()` calls
> `versions.getLatest(Semver version)` method to create the `Version` class.
> {code:java}
> for (Semver start : vertices.subSet(lowerBound, true, to, false))
> {
> // only include pairs that are allowed, and start or end on CURRENT
> if (SUPPORTED_UPGRADE_PATHS.hasEdge(start, to) &&
> edgeTouchesTarget(start, to, CURRENT))
> upgrade.add(new TestVersions(versions.getLatest(start),
> Collections.singletonList(versions.getLatest(to))));
> } {code}
> However, in the `Version.java`, `getLatest()` function never checks whether
> the `first(version)` is in the `versions` map or not. When the version is not
> there, a null pointer exception will be thrown and crash all the upgrade
> tests.
> {code:java}
> public Version getLatest(Semver version)
> {
> return versions.get(first(version)) // <--- Here might cause NPE
> .stream()
> .findFirst()
> .orElseThrow(() -> new RuntimeException("No " +
> version + " versions found"));
> }
> {code}
> h2. How to reproduce
> To reproduce this bug, I'm running Cassandra with commit SHA
> `310d790ce4734727f943225eb951ab0d889c0a5b`; and dtest API with
> `dtest-api-0.0.16.jar`.
> The versions I put under `build/` directory are:
> dtest-4.0.9.jar, dtest-4.0.13.jar, dtest-4.1.4.jar, and dtest-5.1.jar.
> The command I'm running is:
> {code:java}
> $ ant test-jvm-dtest-some -Duse.jdk11=true
> -Dtest.name=org.apache.cassandra.distributed.upgrade.UpgradeTest {code}
> The error message I got was:
> {code:java}
> [junit-timeout] INFO [main] <main> 2024-04-08 17:34:23,936 Versions.java:136
> - Looking for dtest jars in /Users/xxx/Documents/xxx/cassandra/build
> [junit-timeout] Found 4.0.13, 4.0.9
> [junit-timeout] Found 4.1.4
> [junit-timeout] Found 5.1
> [junit-timeout] ------------- ---------------- ---------------
> [junit-timeout] Testcase:
> simpleUpgradeWithNetworkAndGossipTest(org.apache.cassandra.distributed.upgrade.UpgradeTest)-_jdk11:
> Caused an ERROR
> [junit-timeout] null
> [junit-timeout] java.lang.NullPointerException
> [junit-timeout] at
> org.apache.cassandra.distributed.shared.Versions.getLatest(Versions.java:127)
> [junit-timeout] at
> org.apache.cassandra.distributed.upgrade.UpgradeTestBase$TestCase.upgradesTo(UpgradeTestBase.java:218)
> [junit-timeout] at
> org.apache.cassandra.distributed.upgrade.UpgradeTestBase$TestCase.upgradesToCurrentFrom(UpgradeTestBase.java:203)
> [junit-timeout] at
> org.apache.cassandra.distributed.upgrade.UpgradeTest.simpleUpgradeWithNetworkAndGossipTest(UpgradeTest.java:37)
> [junit-timeout] at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> [junit-timeout] at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> [junit-timeout] at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> [junit-timeout]
> [junit-timeout]
> [junit-timeout] Test org.apache.cassandra.distributed.upgrade.UpgradeTest
> FAILED
> {code}
> With some debugging, the version causing the null pointer is `5.0-alpha1`,
> but this version is not shown in `build/` directory and should not be tested
> if I understand correctly.
> h2. How to fix.
> There are two ways to fix this problem. One is to add a null pointer checker
> in `UpgradeTestBase#upgradesTo()`, and the other approach is to add the null
> pointer in `Versions#getLatest()`.
> I would love to provide a PR to fix this issue if you can tell me which fix
> looks better to you.
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