[1.18.1] forge 39.0.18 Log4j NoClassDefFoundError: org/apache/logging/log4j/core/lookup/StrLookup

[Akira_]

I can run MC 1.18.1 + Optifine perfetctly early on. But after I installed Forge 39.0.18 on my client and ran again, I got an error message about log4j below, then I found out that Forge 39.0.18 is using log4j 2.15.0 downloaded by Forge itself.

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/core/lookup/StrLookup

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.core.LoggerContext.<clinit>(LoggerContext.java:85)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:254)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:218)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:136)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:123)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:117)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:150)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:47)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.LogManager.getContext(LogManager.java:196)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.LogManager.getLogger(LogManager.java:599)

    at MC-BOOTSTRAP/[email protected]/org.apache.logging.log4j.LogManager.getLogger(LogManager.java:585)

    at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.main(Launcher.java:76)

    at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)

    at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)

    at [email protected]/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:90)

Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.core.lookup.StrLookup

    at [email protected]/cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135)

    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)

    ... 15 more

 

Edited January 11, 2022 by Akira_
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