When UseObjectMonitorTable is enabled, I have modified it to avoid loading the prototype header in the path that reads the Valhalla-specific mark word flag.

Fixed to detect null copying to null-restricted arrays in FlatArrayKlass::copy_array

I migrated the TestNG-based NAPI tests that were remaining under jdk/net/ExtendedSocketOption to JUnit.

I replaced the @run tag in the tests under HttpClient with ${test.main.class}.

I updated references to the build documentation from the Gtest section in doc/testing.md for both HTML and Markdown formats.

Replaced the certificate generation process in GenKeyStore.java with X509CertImpl.newSigned.

Simplified the normalization process of the significand for BigDecimal(double, MathContext).

Moved StreamLinesTest from TestNG to JUnit and removed dependencies on OpTestCase.

I deleted old comments about Windows 95.

I have tidied up inconsistent spacing around blank areas in multiple files of jdk.httpserver.

Fixed a typo in the code tag in the JavaDoc for the Cipher class.

I addressed the warm boot issue that occurs when closing the channel after a test.