OUTOFMEMORY error in Weblogic server

Our Production server is throwing OutOfMemory Error frequently (once in two days).

When we analyzed the heap dump, it is showing 44% for String, 30% for for ConcurrentLinkedQueue and 21 % for Character Array

How can I reduce the memory utilization for the String , ConcurrentLinkedQueue and char[]?

(For String I can't reduce much since I need to pass macid (string datatype) for each of the request to weblogic server)

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