fix(gateway): don't log IllegalArgumentException as errors

[skayliu]

Description

IllegalArgumentException get thrown when a user passes variables in their request which cannot be converted to message pack. Currently these are being logged as errors. Since this a fault by the user we should log these as debug.

User input should not lead to reported errors, but user command should be rejected with a helpful message.

Related issues

closes #9832

Definition of Done

Not all items need to be done depending on the issue and the pull request.

Code changes:

• The changes are backwards compatibility with previous versions
• If it fixes a bug then PRs are created to backport the fix to the last two minor versions. You can trigger a backport by assigning labels (e.g. backport stable/1.3) to the PR, in case that fails you need to create backports manually.

Testing:

• There are unit/integration tests that verify all acceptance criterias of the issue
• New tests are written to ensure backwards compatibility with further versions
• The behavior is tested manually
• The change has been verified by a QA run
• The impact of the changes is verified by a benchmark

Documentation:

• The documentation is updated (e.g. BPMN reference, configuration, examples, get-started guides, etc.)
• If the PR changes how BPMN processes are validated (e.g. support new BPMN element) then the Camunda modeling team should be informed to adjust the BPMN linting.

Please refer to our review guidelines.

[skayliu]

Hi, @saig0, @korthout . Please take a moment to review this fix when you have time. Thank you.

[github-actions]

Test Results

   962 files  ±    0     962 suites  ±0   1h 50m 11s ⏱️ - 3m 12s
7 843 tests +174  7 836 ✔️ +174  7 💤 ±0  0 ❌ ±0 
8 050 runs  +174  8 041 ✔️ +174  9 💤 ±0  0 ❌ ±0 

Results for commit 69ae007. ± Comparison against base commit 659571b.

♻️ This comment has been updated with latest results.

[saig0]

@skayliu thank you for your contribution. 🎉 We'll have a look at your PR in the next few days. 👀

[remcowesterhoud]

Hi @skayliu! Thanks for the changes, I have tested it locally and it all seems to be working fine. I have one question about the changes though, and a small comment.

🔧 Please also add a testcase to the RequestMapperTest

[skayliu]

Please also add a testcase to the RequestMapperTest

@remcowesterhoud, Done, please check this out. Thank you.

[remcowesterhoud]

Thanks for the fix @skayliu 🙇

bors merge

[skayliu]

Hi, @remcowesterhoud, It seems to need to rebase to main. Done, Please try again, Thank you.

[remcowesterhoud]

bors merge

[zeebe-bors-camunda]

Build failed:

• Test summary

[remcowesterhoud]

bors retry

[zeebe-bors-camunda]

Build succeeded:

• Test summary

[remcowesterhoud]

/backport

[backport-action]

Backport failed for stable/8.0, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally.

git fetch origin stable/8.0
git worktree add -d .worktree/backport-11169-to-stable/8.0 origin/stable/8.0
cd .worktree/backport-11169-to-stable/8.0
git checkout -b backport-11169-to-stable/8.0
ancref=$(git merge-base 659571bbc2651a6a5728428745a457aabe411089 69ae007c7961a29395f428244a9d94a1426e6963)
git cherry-pick -x $ancref..69ae007c7961a29395f428244a9d94a1426e6963

[backport-action]

Successfully created backport PR #11273 for stable/8.1.