failed to remove it when the web application was stopped. Threads are going to be renewed over time

该error的原因：

tomcat关闭应用时的清理工作(3): ThreadLocal

这个泄露其实是可能造成classloader的泄露，因为ThreadLocal引用了自定义的类MyClass，绑定到了当前的请求线程上，而请求线程又是线程池里的线程，生存周期可能会比较长。比如上面模拟的情况，要停止应用的时候，请求线程的ThreadLocal仍未释放，那么即使加载MyClass类的classLoader已经不会再被任何地方使用，可以被垃圾回收了，却因为这个MyClass被引用而得不到回收。

解决方案：

private static ThreadLocal<MyClass> tl = new ThreadLocal<MyClass>();

try{
// doSomething()
} finally {
tl.remove();
}

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