What caused the failure in request processing, indicated by the nested exception being java.lang.NullPointerException, with the root cause also being java.lang.NullPointerException?

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Based on the information provided, it is not possible to accurately determine the cause of the failure. A NullPointerException can occur when a variable is not properly initialized before it is used or when an object reference is not pointing to an actual object. Further analysis and debugging are necessary to determine the exact cause of the exception.