Webcontainer error msgs in systemout.log file

[srinivase nivas]

Hi,

We are using WAS7.0.0.17 on windows server 2008..i have seen some of the error msg with respective to webcontainer like below
[time stamp] thread id systemOut o 6555802357 [webcontainer : 21] ERROR exception -
---------------------------------------------------------[webcontainer : 6] ERROR c.e.n.w.a.WSExceptionTranslatorAdvice - org.apache.cxf.interceptor.Fault: Marshalling Error: null
---------------------------------------------------------[webcontainer : 23] ERROR exception -
---------------------------------------------------------[webcontainer : 20] ERROR exception -
---------------------------------------------------------[webcontainer : 26] ERROR exception -
---------------------------------------------------------[webcontainer : 19] ERROR exception -
---------------------------------------------------------[webcontainer : 14] ERROR exception -
---------------------------------------------------------[webcontainer : 28] ERROR exception -
---------------------------------------------------------[webcontainer : 7] ERROR exception -


Can anyone know about these error code.i didnt see any hung statements in this file..what is the reason to writting into Systemout.log??

Thanks in advance..