core: 12 PMD violations in test sources make ./gradlew build fail

[corioliskraft]

Description

core/src/test/ contains 12 PMD violations, so ./gradlew build fails on :core:pmdTest in a fresh clone. They went unnoticed because pmdTest has never run in CI — see #821.

Fixing these is a prerequisite for #821: adding .PHONY to the Makefile turns main red until they are resolved.

Steps to reproduce

1. Clone the repository at fbab9a7
2. Run ./gradlew build

Actual behavior

:core:pmdTest fails with 12 violations.

File	Line	Rule
KeyFlowAuthenticatorTest.java	64	FieldNamingConventions
KeyFlowAuthenticatorTest.java	74, 80, 86 ×2, 87 ×2, 89	ReplaceJavaUtilDate
KeyFlowAuthenticatorTest.java	293, 337	CloseResource
auth/SetupAuthTest.java	59, 65	ReplaceJavaUtilDate

Expected behavior

./gradlew build succeeds on a fresh clone.

Environment

• OS: macOS Sequoia 15.7.7
• Java version (see java --version): 25.0.1
• Version of the STACKIT Java SDK: N/A, as this concerns building the repository, not consuming a released artifact.

Additional information
The 2 CloseResource findings are false positives: the Response objects are stubs built via Response.Builder with no body, not live connections. The remaining 10 are straightforward.

[GokceGK]

Hi @corioliskraft,

thanks for reporting the issue and also for your contribution.
We will take a look.

Best Regards,
Gökce from the STACKIT Developer Tools Team