fix: ClassCastException when follower forwards positional-param command to leader by robfrank · Pull Request #3961 · ArcadeData/arcadedb

robfrank · 2026-04-22T12:25:38Z

Summary

When a Raft follower forwarded a write command with positional parameters (e.g. INSERT INTO User SET id = ?), the params were serialized as a JSON array [110]. The leader's PostCommandHandler called json.toMap(true), which converted the all-numeric array to float[]{110.0} via the vector-embedding optimization from Cypher Batch creation is slow with vector indexes #3864. The subsequent cast (Map<String,Object>) float[] threw ClassCastException: class [F cannot be cast to class java.util.Map.
Fix 1 (RaftReplicatedDatabase): serialize positional args as an ordinal map {"0": v0, "1": v1, ...} instead of a plain JSON array, matching the canonical format produced by RemoteDatabase.mapArgs() and expected by mapParams() on the leader.
Fix 2 (PostCommandHandler): defensive handling for when params is a List or primitive array - converts to ordinal map, making the handler robust regardless of how params arrive.

Test Plan

New regression test positionalParamsViaFollowerIsProxiedToLeader in RaftLeaderProxyIT - sends a parameterized INSERT via a follower's HTTP endpoint, verifies the record is committed and replicated to all nodes
All 3 tests in RaftLeaderProxyIT pass (ddlViaFollowerIsProxiedToLeader, dmlViaFollowerIsProxiedToLeader, positionalParamsViaFollowerIsProxiedToLeader)

🤖 Generated with Claude Code

…nd to leader When a Raft follower forwarded a write command with positional parameters (e.g. INSERT with ?-placeholders), the params were serialized as a JSON array [110]. The leader's PostCommandHandler called json.toMap(true), which converted the numeric array to float[]{110.0} via the vector-embedding optimization introduced in #3864. The subsequent cast (Map<String,Object>) float[] then threw ClassCastException: class [F cannot be cast to class java.util.Map. Fix 1 (RaftReplicatedDatabase): serialize positional args as an ordinal map {"0": v0, "1": v1, ...} instead of a JSON array, matching the canonical format produced by RemoteDatabase.mapArgs() and expected by mapParams() on the leader. Fix 2 (PostCommandHandler): defensive handling for the case where params is a List or primitive array, converting it to an ordinal map so the handler is robust regardless of how params arrive. Regression test added to RaftLeaderProxyIT. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

codacy-production · 2026-04-22T12:27:00Z

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 25 complexity

Metric Results

Complexity 25

View in Codacy

🟢 Coverage 36.84% diff coverage · -7.25% coverage variation

Metric Results

Coverage variation ✅ -7.25% coverage variation

Diff coverage ✅ 36.84% diff coverage

View coverage diff in Codacy

Coverage variation details

Coverable lines Covered lines Coverage

Common ancestor commit (bd33f49) 118934 86428 72.67%

Head commit (df6b830) 150526 (+31592) 98474 (+12046) 65.42% (-7.25%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

Coverable lines Covered lines Diff coverage

Pull request (#3961) 19 7 36.84%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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gemini-code-assist

Code Review

This pull request addresses a ClassCastException that occurs when positional parameters are proxied to the Raft leader. The fix involves serializing positional arguments as an ordinal map in RaftReplicatedDatabase and updating PostCommandHandler to robustly handle parameters provided as Maps, Lists, or primitive arrays. A regression test has been added to verify the fix. Feedback suggests enhancing the regression test to specifically include an all-numeric array to trigger the float[] optimization path and optimizing HashMap initializations in PostCommandHandler by accounting for the default load factor.

gemini-code-assist · 2026-04-22T12:27:41Z

+    final JSONObject body = new JSONObject()
+        .put("language", "sql")
+        .put("command", "INSERT INTO V1 SET id = ?, name = ?")
+        .put("params", new com.arcadedb.serializer.json.JSONArray().put(42).put("positional-test"));


The current regression test uses a mixed-type array [42, "positional-test"]. While this correctly tests the List handling in PostCommandHandler, it does not trigger the float[] optimization in json.toMap(true) which was the specific cause of the ClassCastException mentioned in the PR description (where an all-numeric array like [110] is converted to a primitive array).

Consider adding a second test case or updating this one to use an all-numeric array to ensure the float[] code path in PostCommandHandler is also covered by the regression suite.

Added in df6b830. The test now sends a second request with params: [42] (all-numeric) via the follower, which exercises the float[] branch in PostCommandHandler. The assertion verifies the response is 200 rather than a 500 ClassCastException.

gemini-code-assist · 2026-04-22T12:27:41Z

+      paramMap = new HashMap<>(list.size());
+      for (int i = 0; i < list.size(); i++)
+        paramMap.put("" + i, list.get(i));


When initializing a HashMap with a known size, it is recommended to account for the default load factor (0.75) to avoid an immediate resize when the map is filled. For a list of size n, the initial capacity should be (int) (n / 0.75f) + 1.

Suggested change

paramMap = new HashMap<>(list.size());

for (int i = 0; i < list.size(); i++)

paramMap.put("" + i, list.get(i));

paramMap = new HashMap<>((int) (list.size() / 0.75f) + 1);

for (int i = 0; i < list.size(); i++)

paramMap.put("" + i, list.get(i));

Fixed in df6b830.

gemini-code-assist · 2026-04-22T12:27:41Z

+      paramMap = new HashMap<>(len);
+      for (int i = 0; i < len; i++)
+        paramMap.put("" + i, java.lang.reflect.Array.get(rawParams, i));


Similar to the List case, the HashMap for primitive arrays should be initialized with a capacity that accounts for the load factor to prevent unnecessary resizing.

Suggested change

paramMap = new HashMap<>(len);

for (int i = 0; i < len; i++)

paramMap.put("" + i, java.lang.reflect.Array.get(rawParams, i));

paramMap = new HashMap<>((int) (len / 0.75f) + 1);

for (int i = 0; i < len; i++)

paramMap.put("" + i, java.lang.reflect.Array.get(rawParams, i));

Fixed in df6b830.

…aces Three related issues fixed in Docker-based Raft HA tests: - DatabaseWrapper.createDatabase(): restore FIXED strategy to prevent the client from following cluster-reported internal Docker addresses (arcadedb-N:2480) after failures. Broaden the retry loop to cover both ServerIsNotTheLeaderException with null leader (post-election window) and general connection failures (server temporarily down during rolling restart). - ContainersTestTemplate: add waitForAllNodesKnowLeader() helper that polls /api/v1/cluster on all nodes until every one reports a non-null leaderHttpAddress. Bridges the window where one node is already leader but followers haven't yet propagated the leader address. - SplitBrainIT.splitBrainPrevention(): call waitForAllNodesKnowLeader() after waitForRaftLeader() before issuing writes, and increase the replication check timeout from 30s to 2 minutes. Without the leader-address wait, addUserAndPhotos() silently dropped writes because the follower's forwardCommandToLeaderViaRaft() failed with a null leader address. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…s from prior test run GroupManagementIT creates testuser without cleanup; FileUtils.deleteRecursively silently fails to delete ./target/config/, leaving stale server-users.jsonl that causes CREATE USER to return 403 on the next run. Dropping the users at test start makes the test idempotent against leftover state. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

The bd33f49 commit added FileUtils.deleteRecursively("./target/config/") to TestServerHelper.deleteDatabaseFolders(), which runs between setTestConfiguration() and startServers() in @beforeeach. This wiped the gremlin-server.yaml, gremlin-server.properties, and gremlin-server.groovy files before the server could read them, so the Gremlin plugin fell back to default settings with no graphs and no traversal sources, causing "traversal source [graph] not configured" failures. Fix: move config file writing to onBeforeStarting(), which is called inside startServers() after folder cleanup but before server.start(). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…verage - Use (int)(n/0.75f)+1 initial capacity for the List<> and primitive-array positional-param HashMaps to avoid rehashing when the map is filled - Extend positionalParamsViaFollowerIsProxiedToLeader to also send an all-numeric array [42] via a follower, exercising the float[] code path that was the original ClassCastException trigger Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

codecov · 2026-04-22T23:53:22Z

Codecov Report

❌ Patch coverage is 21.05263% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.44%. Comparing base (bd33f49) to head (df6b830).
⚠️ Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
...cadedb/server/http/handler/PostCommandHandler.java	28.57%	8 Missing and 2 partials ⚠️
...rcadedb/server/ha/raft/RaftReplicatedDatabase.java	0.00%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3961      +/-   ##
==========================================
+ Coverage   63.84%   64.44%   +0.60%     
==========================================
  Files        1591     1593       +2     
  Lines      118934   119287     +353     
  Branches    25275    25384     +109     
==========================================
+ Hits        75929    76872     +943     
+ Misses      32536    31755     -781     
- Partials    10469    10660     +191

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…skip ci] Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.10 to 42.7.11. Release notes *Sourced from [org.postgresql:postgresql's releases](https://github.com/pgjdbc/pgjdbc/releases).* > v42.7.11 > -------- > > Security > -------- > > * fix: Limit SCRAM PBKDF2 iterations accepted from the server. > pgjdbc was vulnerable to a client-side denial of service in SCRAM-SHA-256 authentication, where a malicious or compromised PostgreSQL server could specify an extremely large PBKDF2 iteration count, causing the client to consume unbounded CPU and potentially exhaust connection pools. The fix introduces a new scramMaxIterations connection property (defaulting to 100,000) to cap iteration counts before computation begins. > See the [Security Advisory](GHSA-98qh-xjc8-98pq) for more detail. > The following [CVE-2026-42198](https://nvd.nist.gov/vuln/detail/CVE-2026-42198) has been issued. > > Changes > ------- > > * fix: Add sources and javadocs to shaded published lib generation [`@sehrope`](https://github.com/sehrope) ([#4043](https://redirect.github.com/pgjdbc/pgjdbc/issues/4043)) > * update Changelog and website for release of 42.7.11 [`@davecramer`](https://github.com/davecramer) ([#4042](https://redirect.github.com/pgjdbc/pgjdbc/issues/4042)) > * Fix scram fix location in changelog and update published artifact developer list [`@sehrope`](https://github.com/sehrope) ([#4041](https://redirect.github.com/pgjdbc/pgjdbc/issues/4041)) > * Restrict test with scram\_iterations to v16+ and release notes [`@sehrope`](https://github.com/sehrope) ([#4040](https://redirect.github.com/pgjdbc/pgjdbc/issues/4040)) > * chore(deps): update ubuntu:24.04 docker digest to 84e77de [`@renovate-bot`](https://github.com/renovate-bot) ([#4017](https://redirect.github.com/pgjdbc/pgjdbc/issues/4017)) > * test: add tests for QueryExecutor#getTransactionState [`@vlsi`](https://github.com/vlsi) ([#4006](https://redirect.github.com/pgjdbc/pgjdbc/issues/4006)) > * chore(deps): update actions/create-github-app-token action to v2.2.2 [`@renovate-bot`](https://github.com/renovate-bot) ([#3983](https://redirect.github.com/pgjdbc/pgjdbc/issues/3983)) > * fix: fix flaky CopyBothResponseTest by using WAL flush LSN [`@vlsi`](https://github.com/vlsi) ([#3979](https://redirect.github.com/pgjdbc/pgjdbc/issues/3979)) > * fix: fix flaky replication restart tests by waiting for confirmed\_flush\_lsn [`@vlsi`](https://github.com/vlsi) ([#3975](https://redirect.github.com/pgjdbc/pgjdbc/issues/3975)) > * test: fix flaky LogicalReplicationStatusTest by polling pg\_stat\_replication [`@vlsi`](https://github.com/vlsi) ([#3974](https://redirect.github.com/pgjdbc/pgjdbc/issues/3974)) > * chore: replace Appveyor with ikalnytskyi/action-setup-postgres [`@vlsi`](https://github.com/vlsi) ([#3966](https://redirect.github.com/pgjdbc/pgjdbc/issues/3966)) > * test: move test table creation from [`@BeforeEach`](https://github.com/BeforeEach) to [`@BeforeAll`](https://github.com/BeforeAll) [`@vlsi`](https://github.com/vlsi) ([#3967](https://redirect.github.com/pgjdbc/pgjdbc/issues/3967)) > * Return jsonb as PGObject fixes Issue [#3926](https://redirect.github.com/pgjdbc/pgjdbc/issues/3926) [`@davecramer`](https://github.com/davecramer) ([#3956](https://redirect.github.com/pgjdbc/pgjdbc/issues/3956)) > * Update docker scripts [`@davecramer`](https://github.com/davecramer) ([#3958](https://redirect.github.com/pgjdbc/pgjdbc/issues/3958)) > * implement require\_auth, this is pretty much how libpq does this. [`@davecramer`](https://github.com/davecramer) ([#3895](https://redirect.github.com/pgjdbc/pgjdbc/issues/3895)) > * docs: add SCRAM authentication test setup section to TESTING.md [`@emmaeng700`](https://github.com/emmaeng700) ([#3945](https://redirect.github.com/pgjdbc/pgjdbc/issues/3945)) > * Add RequireServerVersion annotation for tests [`@sehrope`](https://github.com/sehrope) ([#3939](https://redirect.github.com/pgjdbc/pgjdbc/issues/3939)) > > 🐛 Bug Fixes > ----------- > > * fix: ensure extended protocol messages end with Sync message [`@vlsi`](https://github.com/vlsi) ([#3728](https://redirect.github.com/pgjdbc/pgjdbc/issues/3728)) > * fix: enable cursor-based fetching in extended protocol when transaction started via SQL command [`@vlsi`](https://github.com/vlsi) ([#3996](https://redirect.github.com/pgjdbc/pgjdbc/issues/3996)) > * fix: retry with SSL on IOException when sslMode=ALLOW [`@vlsi`](https://github.com/vlsi) ([#3973](https://redirect.github.com/pgjdbc/pgjdbc/issues/3973)) > * fix: allow fallback to non-SSL connection when sslMode=prefer and sslResponseTimeout kicks in [`@vlsi`](https://github.com/vlsi) ([#3968](https://redirect.github.com/pgjdbc/pgjdbc/issues/3968)) > * fix: catch SecurityException from setContextClassLoader on ForkJoinPool workers [`@vlsi`](https://github.com/vlsi) ([#3962](https://redirect.github.com/pgjdbc/pgjdbc/issues/3962)) > * fix: use compareTo for LogSequenceNumber comparison [`@vlsi`](https://github.com/vlsi) ([#3961](https://redirect.github.com/pgjdbc/pgjdbc/issues/3961)) > * fix: release COPY lock on IOException to prevent connection hang ([#3957](https://redirect.github.com/pgjdbc/pgjdbc/issues/3957)) [`@vlsi`](https://github.com/vlsi) ([#3960](https://redirect.github.com/pgjdbc/pgjdbc/issues/3960)) > > 🧰 Maintenance > ------------- > > * style: replace [`@exception`](https://github.com/exception) with [`@throws`](https://github.com/throws) in getBoolean javadoc [`@vlsi`](https://github.com/vlsi) ([#4035](https://redirect.github.com/pgjdbc/pgjdbc/issues/4035)) > * chore: use `@vlsi/github-actions-random-matrix` npm package [`@vlsi`](https://github.com/vlsi) ([#4008](https://redirect.github.com/pgjdbc/pgjdbc/issues/4008)) > * chore: use tag names for pinning github actions, pin ikalnytskyi/action-setup-postgres [`@vlsi`](https://github.com/vlsi) ([#4007](https://redirect.github.com/pgjdbc/pgjdbc/issues/4007)) > * chore: bump errorprone to 2.48.0 [`@vlsi`](https://github.com/vlsi) ([#4005](https://redirect.github.com/pgjdbc/pgjdbc/issues/4005)) > * test: add [`@DisableLogger`](https://github.com/DisableLogger) annotation to suppress expected log warnings in tests [`@vlsi`](https://github.com/vlsi) ([#3971](https://redirect.github.com/pgjdbc/pgjdbc/issues/3971)) > * chore: suppress deprecations in test code to reduce build verbosity [`@vlsi`](https://github.com/vlsi) ([#3972](https://redirect.github.com/pgjdbc/pgjdbc/issues/3972)) > * chore: replace log warning in ConnectionFactory.closeStream with Throwable.addSuppressed [`@vlsi`](https://github.com/vlsi) ([#3970](https://redirect.github.com/pgjdbc/pgjdbc/issues/3970)) > * chore: use greedy pairwise coverage for CI matrix generation [`@vlsi`](https://github.com/vlsi) ([#3965](https://redirect.github.com/pgjdbc/pgjdbc/issues/3965)) > * chore: use full version tags in GitHub Actions comments [`@vlsi`](https://github.com/vlsi) ([#3963](https://redirect.github.com/pgjdbc/pgjdbc/issues/3963)) > > ⬆️ Dependencies > --------------- ... (truncated) Changelog *Sourced from [org.postgresql:postgresql's changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md).* > [42.7.11] (2026-04-28) > ---------------------- > > ### Security > > * fix: Limit SCRAM PBKDF2 iterations accepted from the server. > pgjdbc was vulnerable to a client-side denial of service in SCRAM-SHA-256 authentication, where a malicious or compromised PostgreSQL server could specify an extremely large PBKDF2 iteration count, causing the client to consume unbounded CPU and potentially exhaust connection pools. The fix introduces a new scramMaxIterations connection property (defaulting to 100,000) to cap iteration counts before computation begins. > See the [Security Advisory](GHSA-98qh-xjc8-98pq) for more detail. > The following [CVE-2026-42198](https://nvd.nist.gov/vuln/detail/CVE-2026-42198) has been issued. > > ### Added > > * feat: implement require\_auth connection property, aligning with libpq behavior [PR [#3895](https://redirect.github.com/pgjdbc/pgjdbc/issues/3895)]([pgjdbc/pgjdbc#3895](https://redirect.github.com/pgjdbc/pgjdbc/pull/3895)) > > ### Changed > > * chore: replace Appveyor CI with ikalnytskyi/action-setup-postgres [PR [#3966](https://redirect.github.com/pgjdbc/pgjdbc/issues/3966)]([pgjdbc/pgjdbc#3966](https://redirect.github.com/pgjdbc/pgjdbc/pull/3966)) > * chore: upgrade Gradle to v9 [PR [#3978](https://redirect.github.com/pgjdbc/pgjdbc/issues/3978)]([pgjdbc/pgjdbc#3978](https://redirect.github.com/pgjdbc/pgjdbc/pull/3978)) > > ### Fixed > > * fix: ensure extended protocol messages end with Sync message [PR [#3728](https://redirect.github.com/pgjdbc/pgjdbc/issues/3728)]([pgjdbc/pgjdbc#3728](https://redirect.github.com/pgjdbc/pgjdbc/pull/3728)) > * fix: enable cursor-based fetching in extended protocol when transaction started via SQL command [PR [#3996](https://redirect.github.com/pgjdbc/pgjdbc/issues/3996)]([pgjdbc/pgjdbc#3996](https://redirect.github.com/pgjdbc/pgjdbc/pull/3996)) > * fix: retry with SSL on IOException when sslMode=ALLOW [PR [#3973](https://redirect.github.com/pgjdbc/pgjdbc/issues/3973)]([pgjdbc/pgjdbc#3973](https://redirect.github.com/pgjdbc/pgjdbc/pull/3973)) > * fix: make sure the driver honours connectTimeout when retrying the connection [PR [#3968](https://redirect.github.com/pgjdbc/pgjdbc/issues/3968)]([pgjdbc/pgjdbc#3968](https://redirect.github.com/pgjdbc/pgjdbc/pull/3968)) > * fix: allow fallback to non-SSL connection when sslMode=prefer and sslResponseTimeout kicks in [PR [#3968](https://redirect.github.com/pgjdbc/pgjdbc/issues/3968)]([pgjdbc/pgjdbc#3968](https://redirect.github.com/pgjdbc/pgjdbc/pull/3968)) > * fix: catch SecurityException from setContextClassLoader on ForkJoinPool workers [PR [#3962](https://redirect.github.com/pgjdbc/pgjdbc/issues/3962)]([pgjdbc/pgjdbc#3962](https://redirect.github.com/pgjdbc/pgjdbc/pull/3962)) > * fix: use compareTo for LogSequenceNumber comparison to handle unsigned values correctly [PR [#3961](https://redirect.github.com/pgjdbc/pgjdbc/issues/3961)]([pgjdbc/pgjdbc#3961](https://redirect.github.com/pgjdbc/pgjdbc/pull/3961)) > * fix: release COPY lock on IOException to prevent connection hang [PR [#3957](https://redirect.github.com/pgjdbc/pgjdbc/issues/3957)]([pgjdbc/pgjdbc#3957](https://redirect.github.com/pgjdbc/pgjdbc/pull/3957)) > * fix: return jsonb as PGObject instead of String [PR [#3956](https://redirect.github.com/pgjdbc/pgjdbc/issues/3956)]([pgjdbc/pgjdbc#3956](https://redirect.github.com/pgjdbc/pgjdbc/pull/3956)) > * fix: align SSL key file permission check with libpq [PR [#3952](https://redirect.github.com/pgjdbc/pgjdbc/issues/3952)]([pgjdbc/pgjdbc#3952](https://redirect.github.com/pgjdbc/pgjdbc/pull/3952)) > * fix: guard connection closed flag with a reentrant lock to protect against concurrent close [PR [#3905](https://redirect.github.com/pgjdbc/pgjdbc/issues/3905)]([pgjdbc/pgjdbc#3905](https://redirect.github.com/pgjdbc/pgjdbc/pull/3905)) Commits * [`78e261f`](pgjdbc/pgjdbc@78e261f) fix: Add sources and javadocs to shaded published lib generation * [`1e09fa0`](pgjdbc/pgjdbc@1e09fa0) update Changelog and website for release of 42.7.11 ([#4042](https://redirect.github.com/pgjdbc/pgjdbc/issues/4042)) * [`d479fa5`](pgjdbc/pgjdbc@d479fa5) Fix scram fix location in changelog and update published artifact developer l... * [`b04fc46`](pgjdbc/pgjdbc@b04fc46) docs: Add scram max iters fix to changelog * [`cf54822`](pgjdbc/pgjdbc@cf54822) test: Disable scram test on older version without scram\_iterations GUC * [`7dbcc79`](pgjdbc/pgjdbc@7dbcc79) test: Add SCRAM max iteration tests * [`c9d41d1`](pgjdbc/pgjdbc@c9d41d1) fix: Limit SCRAM PBKDF2 iterations accepted from the server * [`a340cb2`](pgjdbc/pgjdbc@a340cb2) style: replace [`@exception`](https://github.com/exception) with [`@throws`](https://github.com/throws) in getBoolean javadoc * [`77837f8`](pgjdbc/pgjdbc@77837f8) fix(deps): update dependency org.openrewrite.rewrite:org.openrewrite.rewrite.... * [`23af03b`](pgjdbc/pgjdbc@23af03b) chore(deps): update actions/checkout action to v6 * Additional commits viewable in [compare view](pgjdbc/pgjdbc@REL42.7.10...REL42.7.11) [![Dependabot compatibility 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robfrank and others added 4 commits April 22, 2026 15:42

robfrank merged commit 627d421 into main Apr 22, 2026
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fix: ClassCastException when follower forwards positional-param command to leader#3961

fix: ClassCastException when follower forwards positional-param command to leader#3961
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fix/replica-to-leader-forward

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