public Object getRawCallbackArgument() {
    return keyInfo.getCallbackArg();
  }
Returns the value of the EntryEventImpl field. This is for internal use only. Customers should
always call {@link #getCallbackArgument}

@since GemFire 5.5
geode-core/src/main/java/org/apache/geode/internal/cache/EntryEventImpl.java