ThreadLocal Memory Leak in Java web application - Tomcat

ThreadLocal variables are infamous for creating memory leaks. A memory leak in Java is the amount of memory hold by an object which is not in use and should have been garbage collected, but because of unintended strong references, they still live in Java heap space. There are many ways memory leak can be caused in Java but when this memory leak is caused due to the ThreadLocal variable, it’s referred to as ThreadLocal memory leak. In our last post about the ThreadLocal variable, we have seen How the ThreadLocal variable can make SimpleDateFormat thread-safe and also raised points that in a managed environment like the J2EE application server or a web servers like Tomcat, Jetty, WebSphere or Weblogic use of ThreadLocal should be avoided.
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