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Asked: 2026-06-03T07:56:20+00:00

I am getting threadlocal memory leak errors in Tomcat and I am using ThreadPool,

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I am getting threadlocal memory leak errors in Tomcat and I am using ThreadPool, but have no implementation of ThreadLocal in my webapp.

SEVERE: The web application [/myWebApp] created a ThreadLocal with key of type [org.a
pache.http.impl.cookie.DateUtils$DateFormatHolder$1] (value [org.apache.http.imp
l.cookie.DateUtils$DateFormatHolder$1@4c2849]) and a value of type [java.lang.re
f.SoftReference] (value [java.lang.ref.SoftReference@1e67280]) but failed to rem
ove it when the web application was stopped. Threads are going to be renewed ove
r time to try and avoid a probable memory leak.

What I dont understand is why i am getting threadlocal error although i have not implemented it? I want to get rid of these messages so I searched the web, and in here it is written that in order to clean the threadlocal i need to use:

ThreadLocal.remove()

but I have no implementation of ThreadLocal.. I’ll be appreciated if someone show me a way.

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1 Answer

  1. Editorial Team

    Clearly, something is creating that / those ThreadLocal instances. If it is not your code, then it must be some library you are using, or (unlikely) Tomcat itself.

    I would start by looking at what might be creating instances of 

        org.apache.http.impl.cookie.DateUtils$DateFormatHolder$1

    (That’s an anonymous class in a nested class in DataUtils, by the way … so unless something weird is coing on, the creation will be occuring in the DateUtils.java file.)

    If examining the source code doesn’t help, try debugging the Tomcat instance and setting a breakpoint on the ThreadLocal constructor(s).

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