[logback-user] NPE when extending RollingFileAppender

David Roussel nabble at diroussel.xsmail.com
Tue Feb 11 09:18:19 CET 2014

Did you try stepping through with a debugger to see what was going on?


> On 10 Feb 2014, at 20:07, Johny Johnson <johny.johnson at apx-labs.com> wrote:
> Hi,
> I'm having some trouble getting my custom appender which extends RollingFileAppender working. I've got my logback config being read and can extend FileAppender w/o issues but when I switch over to RollingFileAppender, I get the following:
> java.lang.NullPointerException: null
>         at ch.qos.logback.core.rolling.RollingFileAppender.getFile(RollingFileAppender.java:122) ~[org.apache.sling.commons.log:4.0.0]
> Here is my config:
> <appender name="CUSTOM" class="com.mypackage.logging.CustomLogAppender">
> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
> <fileNamePattern>log.%d{yyyy-MM-dd}.log</fileNamePattern>
> </rollingPolicy>
> <prudent>true</prudent>
> <encoder>
> <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger{36} - %msg%n</pattern>
> </encoder>
> </appender>
> The only method that I override is writeout() as I needed to handle some particular events. Did I missing something obvious in terms of configuration? Any help is appreciated.
> Thanks!
> Johny
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