[ https://jira.qos.ch/browse/SLF4J-463?page=com.atlassian.jira.plugin.system.i... ] Ceki Gülcü commented on SLF4J-463: ---------------------------------- Thank you for pointing out this error.

LogServiceProvider.initialize called twice ------------------------------------------

Key: SLF4J-463 URL: https://jira.qos.ch/browse/SLF4J-463 Project: SLF4J Issue Type: Bug Affects Versions: 2.0.0-alpha0 Reporter: Dan Groves Assignee: Ceki Gülcü Priority: Blocker Fix For: 2.0.0-alpha1

Attachments: logback-demo.tar

With logback 1.3.0-alpha code and slf4j 1.8, {{LogServiceProvider::initialize}} can be called twice.  I did not see this with logback 1.2.3 and slf4j 1.7.25. I attached some test code. The test code uses logback 1.3.0-alpha4, but I saw the problem with all alpha versions of logback 1.3.0. {noformat} $ tar xf logback-demo.tar $ cd logback-demo $ ./gradlew clean build BUILD SUCCESSFUL in 0s 8 actionable tasks: 7 executed, 1 up-to-date $ cd build/distributions $ tar xf logback-demo-1.0-SNAPSHOT.tar $ cd logback-demo-1.0-SNAPSHOT/bin/ $ ./logback-demo 16:30:12,127 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml] 16:30:12,127 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy] 16:30:12,127 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [jar:file:/Users/dgroves/git/demo/logback-demo/build/distributions/logback-demo-1.0-SNAPSHOT/lib/logback-demo-1.0-SNAPSHOT.jar!/logback.xml] 16:30:12,140 |-INFO in ch.qos.logback.core.joran.spi.ConfigurationWatchList@ee7d9f1 - URL [jar:file:/Users/dgroves/git/demo/logback-demo/build/distributions/logback-demo-1.0-SNAPSHOT/lib/logback-demo-1.0-SNAPSHOT.jar!/logback.xml] is not of type file 16:30:12,202 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender] 16:30:12,205 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT] 16:30:12,210 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 16:30:12,230 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG 16:30:12,230 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT] 16:30:12,231 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration. 16:30:12,232 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@18ef96 - Registering current configuration as safe fallback point 16:30:12.233 [main] INFO  demo - test 16:30:12,235 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml] 16:30:12,235 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy] 16:30:12,235 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [jar:file:/Users/dgroves/git/demo/logback-demo/build/distributions/logback-demo-1.0-SNAPSHOT/lib/logback-demo-1.0-SNAPSHOT.jar!/logback.xml] 16:30:12,235 |-INFO in ch.qos.logback.core.joran.spi.ConfigurationWatchList@17ed40e0 - URL [jar:file:/Users/dgroves/git/demo/logback-demo/build/distributions/logback-demo-1.0-SNAPSHOT/lib/logback-demo-1.0-SNAPSHOT.jar!/logback.xml] is not of type file 16:30:12,237 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender] 16:30:12,238 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT] 16:30:12,238 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 16:30:12,239 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG 16:30:12,239 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT] 16:30:12,239 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration. 16:30:12,239 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@50675690 - Registering current configuration as safe fallback point {noformat} If I modify the {{build.gradle}} file in the bundle to comment out the newer dependencies and instead use the older ones, so that the dependencies block looks like: {noformat} dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8" // These cause the double call into LogbackServiceProvider.initialize // implementation "org.slf4j:slf4j-api:1.8.0-beta4" // implementation "ch.qos.logback:logback-classic:1.3.0-alpha4" // These do not cause the double call into LogbackServiceProvider.initialize implementation "org.slf4j:slf4j-api:1.7.25" implementation "ch.qos.logback:logback-classic:1.2.3" } {noformat} I get different output showing only one attempt to initialize logback: {noformat} $ ./gradlew clean build BUILD SUCCESSFUL in 0s 8 actionable tasks: 7 executed, 1 up-to-date $ cd build/distributions/ $ tar xf logback-demo-1.0-SNAPSHOT.tar $ cd logback-demo-1.0-SNAPSHOT/bin/ $ ./logback-demo 16:34:05,882 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml] 16:34:05,882 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy] 16:34:05,882 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [jar:file:/Users/dgroves/git/demo/logback-demo/build/distributions/logback-demo-1.0-SNAPSHOT/lib/logback-demo-1.0-SNAPSHOT.jar!/logback.xml] 16:34:05,894 |-INFO in ch.qos.logback.core.joran.spi.ConfigurationWatchList@ba8a1dc - URL [jar:file:/Users/dgroves/git/demo/logback-demo/build/distributions/logback-demo-1.0-SNAPSHOT/lib/logback-demo-1.0-SNAPSHOT.jar!/logback.xml] is not of type file 16:34:05,960 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender] 16:34:05,963 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT] 16:34:05,967 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 16:34:05,988 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG 16:34:05,988 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT] 16:34:05,988 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration. 16:34:05,989 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@4ca8195f - Registering current configuration as safe fallback point 16:34:05.991 [main] INFO demo - test {noformat}

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