log4j-core/src/main/java/org/apache/logging/log4j/core/config/json/JsonConfigurationFactory.java [44:53]:
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    public JsonConfigurationFactory() {
        for (final String dependency : dependencies) {
            if (!Loader.isClassAvailable(dependency)) {
                LOGGER.debug("Missing dependencies for Json support, ConfigurationFactory {} is inactive", getClass().getName());
                isActive = false;
                return;
            }
        }
        isActive = true;
    }
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log4j-core/src/main/java/org/apache/logging/log4j/core/config/yaml/YamlConfigurationFactory.java [45:54]:
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    public YamlConfigurationFactory() {
        for (final String dependency : dependencies) {
            if (!Loader.isClassAvailable(dependency)) {
                LOGGER.debug("Missing dependencies for Yaml support, ConfigurationFactory {} is inactive", getClass().getName());
                isActive = false;
                return;
            }
        }
        isActive = true;
    }
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