@Override
        public PluginClassLoader newPluginClassLoader(
                URL pluginLocation,
                URL[] urls,
                ClassLoader parent
        ) {
            return AccessController.doPrivileged(
                    (PrivilegedAction<PluginClassLoader>) () ->
                            new SynchronizedPluginClassLoader(pluginLocation, urls, parent, pclBreakpoint)
            );
        }
From the test orchestrating thread, await for the test thread to continue execution
@throws InterruptedException If the current thread is interrupted while waiting
@throws BrokenBarrierException If the test thread is interrupted while waiting
@throws TimeoutException If the barrier is not reached before 1s passes.
connect/runtime/src/test/java/org/apache/kafka/connect/runtime/isolation/SynchronizationTest.java