Some of the tests in test/jdk/java/net/httpclient use the jdk.tracePinnedThreads system property when launching the test. This system property was made available through the Virtual Threads implementation for debugging pinning of threads.

In Java 24, through https://bugs.openjdk.org/browse/JDK-8338383, the support for this system property was removed (https://github.com/openjdk/jdk/pull/21565 ). Since then, the Virtual Threads implementation in the JDK no longer recognizes or supports this system property.

These tests in httpclient should be updated to remove the use of this outdated system property.