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https://issues.apache.org/jira/browse/IGNITE-11486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17574860#comment-17574860
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Maxim Muzafarov commented on IGNITE-11486:
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Log4j was removed IGNITE-16650
I think the issue can be viewed from a new angle from now on.
> Support Automatic modules for ignite-zookeeper: Migrate to log4j2 to resolve
> issues with logging packages conflict
> ------------------------------------------------------------------------------------------------------------------
>
> Key: IGNITE-11486
> URL: https://issues.apache.org/jira/browse/IGNITE-11486
> Project: Ignite
> Issue Type: Sub-task
> Reporter: Dmitry Pavlov
> Priority: Minor
>
> Usage of Ignite Zookeeper module in a modular environment failed
> {noformat}
> error: the unnamed module reads package org.apache.log4j from both
> slf4j.log4j12 and log4j
> {noformat}
> slf4j version is updated by the build system when Ignite Zookeeper is used.
> {noformat}
> +--- org.slf4j:slf4j-api:1.7.7 -> 1.7.25
> +--- org.slf4j:slf4j-log4j12:1.7.7 -> 1.7.25
> +--- org.slf4j:slf4j-api:1.7.25
> \--- log4j:log4j:1.2.17
> {noformat}
> Probably we should update whole Ignite dependency for Slf4j
> Following combination seems to be compilable in a modular environment
> {code}
> compile (group: 'org.apache.ignite', name: 'ignite-zookeeper', version:
> ignVer) {
> exclude group: "org.slf4j", module: "slf4j-log4j12"
> exclude group: "log4j", module: "log4j"
> }
> compile group: "org.slf4j", name: "slf4j-api", version: "1.7.25"
> compile group: "org.apache.logging.log4j", name: "log4j-slf4j-impl",
> version: "2.11.2"
> {code}
> According to https://www.slf4j.org/news.html only 1.8x version is
> modularized, but this major versions line contains only betas. See also
> https://logging.apache.org/log4j/2.0/log4j-slf4j-impl/
> See also https://blogs.apache.org/logging/entry/moving_on_to_log4j_2
> Migration quide https://logging.apache.org/log4j/2.x/manual/migration.html
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