JBoss does not boot with jboss-logmanager-ecs-formatter configured

[guillermomolina]

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I have JBoss 7.4.15.

I've added the module as the documentation suggested:

modules/co/elastic/logging/main/module.xml

<?xml version="1.0" encoding="UTF-8"?>
    <module xmlns="urn:jboss:module:1.9" name="co.elastic.logging">
    <resources>
        <resource-root path="ecs-logging-core-1.6.0.jar"/>
        <resource-root path="jboss-logmanager-ecs-formatter-1.6.0.jar"/>
    </resources>
    <dependencies>
        <module name="org.jboss.logmanager" />
    </dependencies>
</module>

standalone/configuration/standalone.xml

            <formatter name="ECS">
                <custom-formatter module="co.elastic.logging" class="co.elastic.logging.jboss.logmanager.EcsFormatter" />
            </formatter>

JBoss won't boot:

05:58:44,002 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation ("add") failed - address: ([("subsystem" => "logging")]): java.lang.IllegalArgumentException: Failed to instantiate class "co.elastic.logging.jboss.logmanager.EcsFormatter" for formatter "ECS"
        at org.jboss.logmanager.config.AbstractPropertyConfiguration$ConstructAction.lambda$validate$2(AbstractPropertyConfiguration.java:122)
        at org.jboss.logmanager.config.WrappedAction.execute(WrappedAction.java:47)
        at org.jboss.logmanager.config.AbstractPropertyConfiguration$ConstructAction.validate(AbstractPropertyConfiguration.java:118)
        at org.jboss.logmanager.config.LogContextConfigurationImpl.doPrepare(LogContextConfigurationImpl.java:336)
        at org.jboss.logmanager.config.LogContextConfigurationImpl.prepare(LogContextConfigurationImpl.java:289)
        at org.jboss.as.logging.logmanager.ConfigurationPersistence.prepare(ConfigurationPersistence.java:299)
        at org.jboss.as.logging.LoggingOperations$CommitOperationStepHandler.lambda$execute$0(LoggingOperations.java:131)
        at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:1063)
        at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:784)
        at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:470)
        at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1430)
        at org.jboss.as.controller.ModelControllerImpl.boot(ModelControllerImpl.java:559)
        at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:546)
        at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:508)
        at org.jboss.as.server.ServerService.boot(ServerService.java:462)
        at org.jboss.as.server.ServerService.boot(ServerService.java:415)
        at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:447)
        at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at org.jboss.logmanager.config.AbstractPropertyConfiguration$ConstructAction.lambda$validate$2(AbstractPropertyConfiguration.java:120)
        ... 17 more
Caused by: java.lang.NoClassDefFoundError: java/util/logging/LogManager
        at co.elastic.logging.jboss.logmanager.EcsFormatter.getProperty(EcsFormatter.java:127)
        at co.elastic.logging.jboss.logmanager.EcsFormatter.<init>(EcsFormatter.java:48)
        ... 22 more
Caused by: java.lang.ClassNotFoundException: java.util.logging.LogManager from [Module "co.elastic.logging" from local module loader @56cbfb61 (finder: local module finder @1134affc (roots: /aplicacions/jboss/modules,/aplicacions/jboss/modules/system/layers/base))]
        at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:255)
        at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:410)
        at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
        at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:116)
        ... 24 more

Please help me, is there anything more to add to the module definition? Thanks