Fix child constructor no longer has invalid access to parent field

[wing328]

Fix #23204

based on #23043

tested locally to confirm the issue and the fix

[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.633 s -- in org.openapitools.client.api.DefaultApiTest
[INFO] Running org.openapitools.client.model.ChildTest
[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.007 s -- in org.openapitools.client.model.ChildTest
[INFO] Running org.openapitools.client.model.ParentTest
[INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.004 s -- in org.openapitools.client.model.ParentTest
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0
[INFO]
[INFO]
[INFO] --- jar:3.4.1:jar (default-jar) @ openapi-java-client ---
[INFO] Building jar: C:\Users\User\AppData\Local\Temp\mip\target\openapi-java-client-v1.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.982 s
[INFO] Finished at: 2026-03-11T16:26:48+08:00
[INFO] ------------------------------------------------------------------------\

cc @bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @martin-mfg (2023/08)

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---

Summary by cubic

Fixes a Java microprofile client codegen bug where child constructors accessed private parent readOnly fields, causing compilation errors. Model fields are now generated as protected so subclasses can access parent fields. Fixes #23204.

• Bug Fixes
  • Update Java/libraries/microprofile/pojo.mustache to generate model fields as protected instead of private.
  • Add test and repro spec (issue_23034.yaml) to verify Parent.java contains a protected parent field and compiles.
  • Regenerate samples across microprofile variants to reflect protected fields in models.

^{Written for commit 9b7e525. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 173 files

Note: This PR contains a large number of files. cubic only reviews up to 75 files per PR, so some files may not have been reviewed.