log4J: could not able to see the log file

[ramaa Vadakattuu]

I am working on Eclipse IDE
I encountered the following problem
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1) if i use the absolute path for the parameter File in appender like below
<appender name="ROLLING" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="D:/sample.log"/>

Then i am able to see the log file at that path.
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if i use relative path for the parameter File in appender like below

<appender name="ROLLING" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="sample.log"/>

I could not able to find the file no where in the drive where the Web-App is running.

I could not able to find out why it is behaving like this?
Can anyone please guide me on how to resolve the above issue?