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SEVERE: web application [/ helloWorld] created ThreadLocal with a type key

Starting a web application, on tomcat 7.0.29, when the application stops, the following error is issued

SEVERE: The web application [/helloWorld] created a ThreadLocal with key of type [com.sun.xml.bind.v2.ClassFactory$1] (value [com.sun.xml.bind.v2.ClassFactory$1@1b7b32c]) and a value of type [java.util.WeakHashMap] (value [{class com.test.jaxws_asm.CreateSession=java.lang.ref.WeakReference@a06d25}]) 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.
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