TransmittableThreadLocal (TTL), the missing Java™ std lib(simple & 0-dependency) for framework/middleware, provide an enhanced InheritableThreadLocal that transmits values between threads even using thread pooling components. In the case of using thread pools and other execution components that will pool multiple threads, the ThreadLocalvalue transfer function is provided to solve the problem of context transfer during asynchronous execution. A Javastandard library should provide standard capabilities for framework/middleware facility development. ThreadLocalThe demand scenario is TransmittableThreadLocalthe potential demand scenario. If your business needs to "pass ThreadLocalvalues in the case of using thread pools and other execution components that will pool multiple threads ", it is the TransmittableThreadLocaltarget scenario.