This is the function of class [`InheritableThreadLocal`](http://docs.oracle.com/javase/7/docs/api/java/lang/InheritableThreadLocal.html), should use class [`InheritableThreadLocal`](http://docs.oracle.com/javase/7/docs/api/java/lang/InheritableThreadLocal.html) instead.
This is the function of class [`InheritableThreadLocal`](https://docs.oracle.com/javase/8/docs/api/java/lang/InheritableThreadLocal.html), should use class [`InheritableThreadLocal`](https://docs.oracle.com/javase/8/docs/api/java/lang/InheritableThreadLocal.html) instead.
But when use thread pool, thread is cached up and used repeatedly. Transmitting value from parent thread to child thread has no meaning.
Application need transmit value from the time task is created to the point task is executed.
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@@ -229,12 +230,12 @@ Check available version at [search.maven.org](http://search.maven.org/#search%7C
*[Java SE 6 新特性: Instrumentation 新功能](http://www.ibm.com/developerworks/cn/java/j-lo-jse61/)
*[Creation, dynamic loading and instrumentation with javaagents](http://dhruba.name/2010/02/07/creation-dynamic-loading-and-instrumentation-with-javaagents/)
*[Java SE 6 新特性: Instrumentation 新功能](http://www.ibm.com/developerworks/cn/java/j-lo-jse61/)
*[Creation, dynamic loading and instrumentation with javaagents](http://dhruba.name/2010/02/07/creation-dynamic-loading-and-instrumentation-with-javaagents/)
*[Java SE 6 新特性: Instrumentation 新功能](http://www.ibm.com/developerworks/cn/java/j-lo-jse61/)
*[Creation, dynamic loading and instrumentation with javaagents](http://dhruba.name/2010/02/07/creation-dynamic-loading-and-instrumentation-with-javaagents/)
> The Stack and the Map are managed per thread and are based on ThreadLocal by default. The Map can be configured to use an InheritableThreadLocal by setting system property isThreadContextMapInheritable to "true". When configured this way, the contents of the Map will be passed to child threads. However, as discussed in the [Executors](http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/Executors.html#privilegedThreadFactory%28%29) class and in other cases where thread pooling is utilized, the ThreadContext may not always be automatically passed to worker threads. In those cases the pooling mechanism should provide a means for doing so. The getContext() and cloneStack() methods can be used to obtain copies of the Map and Stack respectively.
> The Stack and the Map are managed per thread and are based on ThreadLocal by default. The Map can be configured to use an InheritableThreadLocal by setting system property isThreadContextMapInheritable to "true". When configured this way, the contents of the Map will be passed to child threads. However, as discussed in the [Executors](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executors.html#privilegedThreadFactory%28%29) class and in other cases where thread pooling is utilized, the ThreadContext may not always be automatically passed to worker threads. In those cases the pooling mechanism should provide a means for doing so. The getContext() and cloneStack() methods can be used to obtain copies of the Map and Stack respectively.
