Gili created LOGBACK-1457:
-----------------------------
Summary: Avoid instantiating unused appenders
Key: LOGBACK-1457
URL: https://jira.qos.ch/browse/LOGBACK-1457
Project: logback
Issue Type: Improvement
Components: logback-core
Affects Versions: 1.2.3
Environment: If {{logback.xml}} contains a FILE appenders, but the
parent directories cannot be created then we get a runtime exception. Example:
{code:java}
18:49:04,076 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[FILE] -
openFile(null,true) call failed. java.io.FileNotFoundException:
log/auction-house-cluster.2019-02-06.log (No such file or directory)
at java.io.FileNotFoundException: log/auction-house-cluster.2019-02-06.log (No
such file or directory)
at java.base/java.io.FileOutputStream.open0(Native Method)
at java.base/java.io.FileOutputStream.open(FileOutputStream.java:298)
at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:237)
at
ch.qos.logback.core.recovery.ResilientFileOutputStream.<init>(ResilientFileOutputStream.java:26)
at ch.qos.logback.core.FileAppender.openFile(FileAppender.java:204)
at ch.qos.logback.core.FileAppender.start(FileAppender.java:127)
at
ch.qos.logback.core.rolling.RollingFileAppender.start(RollingFileAppender.java:100)
at ch.qos.logback.core.joran.action.AppenderAction.end(AppenderAction.java:90)
at ch.qos.logback.core.joran.spi.Interpreter.callEndAction(Interpreter.java:309)
at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:193)
at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:179)
at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:62)
at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:165)
at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:152)
at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:110)
at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:53)
at
ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75)
at
ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:150)
at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:84)
at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at com.company.Testcase.<clinit>(Testcase.java:16)
{code}
However, when we run under Docker we want to keep the appender definition in
place but direct output to STDOUT instead. The problem is that Logback
initializes the appender even when it isn't in use, consequently we get an
error even when nothing is wrong. There are workarounds, such as conditional
blocks, but reduce the readability of the configuration file.
Please avoid initializing unused appenders.
Reporter: Gili
Assignee: Logback dev list
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