Logback encoders are not working with LoggingAppender

[Khidala]

Logback encoders are not working with LoggingAppender. Can encoders be used with LoggingAppender for layout/pattern usage?

Environment details

Need to use https://logback.qos.ch/manual/encoders.html with google-cloud-logging-logback, but it doesn't work when I use encoder with google-cloud-logging-logback version 0.130.17-alpha.

Steps to reproduce

1. Use LoggingAppender in logback.xml
2. Add encoder element to logback.xml.

Code example

Contents of logback.xml:

<configuration>
  <appender name="CLOUD" class="com.google.cloud.logging.logback.LoggingAppender">
    <!-- Optional : filter logs at or above a level -->
    <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
      <level>DEBUG</level>
    </filter>
    <log>application.log</log> <!-- Optional : default java.log -->
    <resourceType>gae_app</resourceType> <!-- Optional : default: auto-detected, fallback: global -->
    <enhancer>com.server.utils.LoggingEnhancerSimple</enhancer> <!-- Optional -->
    <flushLevel>WARN</flushLevel> <!-- Optional : default ERROR -->
    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
      <pattern>%d %-5level [%thread] %logger{0}: %msg%n</pattern>
    </encoder>
  </appender>

  <root level="debug">
    <appender-ref ref="CLOUD" />
  </root>
</configuration>

Stack trace

In App Engine Standard Java 17 log I see this error at startup:
`ERROR in ch.qos.logback.core.joran.spi.Interpreter@12:16 - no applicable action for [pattern], current ElementPath  is [[configuration][appender][encoder][pattern]]`

External references such as API reference guides

https://github.com/googleapis/java-logging-logback
See "Usage" section which says encoders can be used with LoggingAppender.

[peterweb2005]

excuse me

how is the status? Reminded to migrate on January 30, 2024

thanks

[cindy-peng]

Hi @peterweb2005 , I am sorry about the late reply. Are you still running into this issue?