tomcat - Vaadin 应用程序创建导致内存泄漏的线程

Question

我有一个 Vaadin 应用程序的问题，它创建了一些线程，Tomcat 说它们可能会导致内存泄漏问题。我不会以显式方式创建线程。

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。

在开发过程中第一次遇到这个错误。

如何避免这些问题？

Answer 1

这些问题都与 Vaadin 完全无关。

您(或您正在使用的库)创建了一个 java.util.Timer 但没有取消它。

此外，“Threadlocal”问题似乎是由 Apache Axiom 引起的，并且似乎已在 Axiom 1.2.12 中修复(参见 http://ws.apache.org/axiom/ 和 http://ws.apache.org/axiom/)