Neeme Praks created LOGBACK-1497:
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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 ":-".
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