Problem with logging in webservices

I need one tech help for the team.
We are using log4j for logging purpose.
Actually we have one web application which is already developed and using log4j for logging purpose.
And as an enhancement , we are having Webservices project on the application.
We are using same log4j for logging the webservices details also.But we use different properties file to include different file names.
The application is developed using j2ee technologies and the server used is JBOSS-Apache tomcat server
The problem we are facing is the writing to log file by the main application and webservices application becoming inconsistent,for eg: sometimes both are writing properly ,sometimes,webservices writes and not the main application...it stops logging and viceversa..but if we repeat the same,we are able to get the same kind of inconsistencies without any change...
if u know about log4j please let me know.

What do you mean main application and webservice? I guess your main application is webservice client and both of them have different process and try to share to use same log file. In this case, the client can waiting for webservice method call, set enough timeout for that.
or translate Exception from webservice to your main aplication, and let main application to control the log file.
Or for Log4j in XML it can define different output at same time, just define one for main application and one for main application

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