How does automatic modules behave in multithreaded code?

Automatic modules in Java can behave differently in multithreaded contexts, especially regarding encapsulation and visibility of packages. When using automatic modules, classes are made available to the entire module path, potentially leading to conflicts or unintended access. This behavior necessitates careful management of thread safety and visibility across different threads.

In a multithreaded environment, it's crucial to ensure that shared resources are properly synchronized, regardless of whether those resources are contained within automatic modules. This can help prevent issues such as race conditions and data corruption.

Example of Multithreading with Automatic Modules

        import java.util.concurrent.ExecutorService;
        import java.util.concurrent.Executors;

        public class AutomaticModuleExample {
            private static int sharedResource = 0;

            public static void main(String[] args) {
                ExecutorService executor = Executors.newFixedThreadPool(2);

                Runnable task = () -> {
                    for (int i = 0; i < 1000; i++) {
                        incrementResource();
                    }
                };

                executor.submit(task);
                executor.submit(task);
                executor.shutdown();
            }

            private synchronized static void incrementResource() {
                sharedResource++;
            }
        }