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androidlogginglogbackappender

Does logback-android support DBAppender?

The android implementation of logback appears to be missing the DBAppender class.

Here's my relevant logback appender config, located in assets/logback.xml. 

    <appender name="DB" class="ch.qos.logback.classic.db.DBAppender">
        <connectionSource class="ch.qos.logback.core.db.DriverManagerConnectionSource">
            <driverClass>com.mysql.jdbc.Driver</driverClass>
            <url>jdbc:mysql://10.2.2.222:3306/logback</url>
            <user>username</user>
            <password>thepassword</password>
        </connectionSource>
    </appender>

And gradle:

implementation 'org.slf4j:slf4j-api:1.7.25'
implementation 'com.github.tony19:logback-android:1.1.1-12'

and the resulting error in my logcat:

20:40:50,225 |-ERROR in ch.qos.logback.core.joran.action.AppenderAction -
  Could not create an Appender of type [ch.qos.logback.classic.db.DBAppender].
    ch.qos.logback.core.util.DynamicClassLoadingException: 
  Failed to instantiate type ch.qos.logback.classic.db.DBAppender
    at ch.qos.logback.core.util.DynamicClassLoadingException: 
  Failed to instantiate type ch.qos.logback.classic.db.DBAppender

and

Caused by: ch.qos.logback.core.util.DynamicClassLoadingException: 
   Failed to instantiate type ch.qos.logback.classic.db.DBAppender

and

Caused by: java.lang.ClassNotFoundException: 
   Didn't find class "ch.qos.logback.classic.db.DBAppender"

Logback is properly working otherwise, if I comment out the database stuff and just have it log to a file, it instantiates correctly and generates text in the log file.

I've found examples of people using the DBAppender, but haven't found any that appear to be android based.

ps: I've also tried the other option, DataSourceConnectionSource (as opposed to the shown DriverManagerConnectionSource) but it actually uses the same appender, and so has the same error as a result. I also can't find any references to to DBAppender in the github files.

Solution

  • logback-android currently does not support DBAppender, and there are no firm plans to carry over that feature. The only database appender supported is SQLiteAppender.

    It should be relatively simple to pull DBAppender's relevant source from logback into its own library that could be used in logback-android. For a future major release, I plan on splitting out several built-in appenders in this way to minimize the library size.