[logback-user] Custom appender is being ignored

[Ceki Gülcü]

The start() method is akin to a constructor check.

The start method should check whether all required parameters have been
passed during configuration. If required parameters are missing, the
appender should refuse to start and warn the user.

The stop() method should release resources if any.

-- 
Ceki Gülcü

Sponsoring SLF4J/logback/reload4j at https://github.com/sponsors/qos-ch


On 7/25/2022 8:27 PM, Zac Harvey wrote:
> Thank you Ceki! I called start() in the CatAppender constructor and
> everything is now working. Are there recommended practices as to when
> (and from where) to call start() and stop()? Thanks again so much!
> 
> Best,
> Zac
> 
> On Mon, Jul 25, 2022 at 2:14 PM Ceki Gülcü <ceki at qos.ch
> <mailto:ceki at qos.ch>> wrote:
> 
>     Hello Zac,
> 
>     AppenderBase will not invoke the append() method less the appender has
>     the started flag set to true.
> 
> 
>     -- 
>     Ceki Gülcü
> 
>     Sponsoring SLF4J/logback/reload4j at
>     https://github.com/sponsors/qos-ch <https://github.com/sponsors/qos-ch>
> 
>     On 7/25/2022 6:38 PM, Zac Harvey wrote:
>     > Java 11 and logback-classic-1.2.11 here. I'm trying to write my own
>     > custom appender and am following this Baeldung article
>     > <https://www.baeldung.com/custom-logback-appender
>     <https://www.baeldung.com/custom-logback-appender>> to test it out.
>     >
>     > My *src/main/java/myapp/logging/CatAppender* appender (on the runtime
>     > classpath):
>     >
>     > public class CatAppender extends AppenderBase<ILoggingEvent> {
>     >     @Override
>     >     protected void append(ILoggingEvent eventObject) {
>     >         System.out.println("meow");
>     >     }
>     > }
>     >
>     > My *src/main/resources/logback.xml*:
>     >
>     > <?xml version="1.0" encoding="UTF-8"?>
>     > <configuration debug="true">
>     >
>     >     <appender name="cat" class="myapp.logging.CatAppender"/>
>     >
>     >     <root level="info">
>     >         <appender-ref ref="cat" />
>     >     </root>
>     >
>     > </configuration>
>     >
>     > In my *build.gradle* I specify to use logback and Lombok:
>     >
>     > plugins {
>     >     id "io.freefair.lombok" version '6.4.0'
>     > }
>     >
>     > dependencies {
>     >     implementation (
>     >         'ch.qos.logback:logback-classic:1.2.11'
>     >         ,'org.projectlombok:lombok:1.18.16'
>     >     )
>     > }
>     >
>     > And then in my Java code I use Lombok to inject an SLF4J logger
>     like so:
>     >
>     > @Slf4j
>     > public class SomethingDoer {
>     >
>     >     public void doSomething() {
>     >         log.info <http://log.info> <http://log.info
>     <http://log.info>>("this should invoke the CatAppender...");
>     >     }
>     >
>     > }
>     >
>     > But when *SomethingDoer#doSomething()* runs, I don't see a meow
>     printed
>     > to my STDOUT console. Have I wired anything up incorrectly here?
>     >
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> 
> 
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-- 
Ceki Gülcü

Sponsoring SLF4J/logback/reload4j at https://github.com/sponsors/qos-ch