ywlscpl@ubuntu:~$ awk -F '[][]' '/Fail to/&&T~/yyyy/{print v}/Fail to/{T=$4;v=""}{v=v"\n"$0}' file
2011-03-23 21:27:51.823[ERROR][yyyyyyyyyyyyyyyyyyy] - Fail to yyyyyyyyyy
java.io.FileNotFoundException
at com.xxx.xxx(XXX.java:8
at com.xxx.xxx(XXX.java:499)
at com.xxx.yyy(YYY.java:155)
at sun.yyy.yyy(YYY.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
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