Logback RollingFileAppender Not Working

Logback RollingFileAppender Not Working

I have the following logback.xml file:
<configuration>
<!--Daily rolling file appender -->
<appender name="FILE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>/usr/share/tomcat6/logs/api.log</File>
<rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<FileNamePattern>/usr/share/tomcat6/logs/api/api.%d{yyyy-MM-dd}.gz</FileNamePattern>
</rollingPolicy>
<encoder>
<pattern>%date %level [%thread] %logger{10} [%file:%line]
%msg%n</pattern>
</encoder>
</appender>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%msg%n</pattern>
</encoder>
</appender>
<root level="debug">
<appender-ref ref="FILE" />
<appender-ref ref="STDOUT" />
</root>
</configuration>
My log file is working just fine. The folling file aspect however is not.
Instead of gzipping the file and moving it into the api folder, it is
putting it in the same directory and renaming it to
api.log(string of numbers).tmp
e.g.
api.log849916939395200.tmp
Does anyone know why this is happening?