Logging Configuration Not Producing Output
Application is running but logging statements produce no output. Debug logs don't appear even with verbose configuration. Application logs nowhere for troubleshooting despite logging statements in code.
Logging framework is configured but output isn't being written.
Error Messages You Might See
Common Causes
- Logging configuration file (logback.xml, log4j.properties) not in classpath
- Log level set too high (WARN, ERROR only) hiding DEBUG/INFO messages
- Logger name doesn't match configuration (logger "com.example" vs config for "com.other")
- Appender (file, console) not configured properly
- Log file path doesn't exist or isn't writable
How to Fix It
Verify logging config file exists: src/main/resources/logback.xml (Logback). Check log level: should include INFO or DEBUG. Verify logger name matches: new Logger("com.example.MyClass"). Verify appenders: console for local, file for production. Test with: logger.info("test message") should appear. Check file permissions: can application write to log file directory?
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Get HelpFrequently Asked Questions
Where should logback.xml be located?
src/main/resources/logback.xml. Built into JAR at runtime. Automatically found by Logback on startup.
How to see all logs?
Set root logger level to DEBUG: <root level="DEBUG">. Or specific logger: <logger name="com.example" level="DEBUG"/>.
How to log to file?
Configure FileAppender in logback.xml: <appender name="FILE" class="ch.qos.logback.core.FileAppender"><file>/var/log/app.log</file></appender>.