Hi Ramachandran,
As stated by support team the error stack "java.lang.
Also did you got chance to try ibm agent as suggested by supported on help ticket,
One quick query i want to check with you is do you have custom split rules OR http collectors in UI on servlet requests if yes can you disable such rules and check behavior.
Also we see agent should not be causing classcastexception because agent does not change the class type YFS_