Neeme Praks created LOGBACK-1497: ------------------------------------ Summary: Empty default variable value results in _IS_UNDEFINED Key: LOGBACK-1497 URL: https://jira.qos.ch/browse/LOGBACK-1497 Project: logback Issue Type: Bug Components: logback-core Affects Versions: 1.2.3 Reporter: Neeme Praks Assignee: Logback dev list Priority: Minor Config file: {code:xml} <?xml version="1.0" encoding="UTF-8"?> <configuration> <appender name="HUMAN" class="ch.qos.logback.core.FileAppender"> <file>test.log</file> <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"> <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %level %logger{35} - %msg ${log.pattern.suffix:-}%n</Pattern> </encoder> </appender> <root level="INFO"> <appender-ref ref="HUMAN" /> </root> </configuration> {code} The variable ${log.pattern.suffix} is not defined. *Observed behaviour*: ${log.pattern.suffix:-} is replaced with "log.pattern.suffix_IS_UNDEFINED" *Expected behaviour*: ${log.pattern.suffix:-} should be replaced with empty string (as there is empty string after ":-". -- This message was sent by Atlassian JIRA (v7.3.1#73012)