我的 Vaadin 应用程序有问题，它创建了一些线程，Tomcat 说它们可能导致内存泄漏问题。我不会以明确的方式创建线程。
SEVERE: The web application [/MyApp] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
ott 29, 2012 9:52:00 AM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
和：
SEVERE: The web application [/MyApp] created a ThreadLocal with key of type [org.apache.axiom.util.UIDGenerator$1] (value [org.apache.axiom.util.UIDGenerator$1@1f7b22b]) and a value of type [org.apache.axiom.util.UIDGeneratorImpl] (value [org.apache.axiom.util.UIDGeneratorImpl@d25438]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
ott 29, 2012 9:52:00 AM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/MyApp] created a ThreadLocal with key of type [org.apache.axiom.util.UIDGenerator$1] (value [org.apache.axiom.util.UIDGenerator$1@1f7b22b]) and a value of type [org.apache.axiom.util.UIDGeneratorImpl] (value [org.apache.axiom.util.UIDGeneratorImpl@975b37]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
这让应用程序非常不稳定。
在开发过程中，这是我第一次遇到此错误。
怎样才能避免这些问题？