A method to clean ThreadLocal

private void cleanThreadLocals() {        try {            // Get a reference to the thread locals table of the current thread            Thread thread = Thread.currentThread();            Field threadLocalsField = Thread.class.getDeclaredField("threadLocals");            threadLocalsField.setAccessible(true);            Object threadLocalTable = threadLocalsField.get(thread);            // Get a reference to the array holding the thread local variables inside the            // ThreadLocalMap of the current thread            Class threadLocalMapClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");            Field tableField = threadLocalMapClass.getDeclaredField("table");            tableField.setAccessible(true);            Object table = tableField.get(threadLocalTable);            // The key to the ThreadLocalMap is a WeakReference object. The referent field of this object            // is a reference to the actual ThreadLocal variable            Field referentField = Reference.class.getDeclaredField("referent");            referentField.setAccessible(true);            for (int i=0; i < Array.getLength(table); i++) {                // Each entry in the table array of ThreadLocalMap is an Entry object                // representing the thread local reference and its value                Object entry = Array.get(table, i);                if (entry != null) {                    // Get a reference to the thread local object and remove it from the table                    ThreadLocal threadLocal = (ThreadLocal)referentField.get(entry);                    threadLocal.remove();                }            }        } catch(Exception e) {            // We will tolerate an exception here and just log it            throw new IllegalStateException(e);        }    }