If you get a NoClassDefFoundError doing a search for "wildfly module NoClassDefFoundError <CLASS>" usually gives you the details you need. I've also got a script that searches through modules directory for a jar with a specific class name, but only use that as a last resort. In case you're on a Linux box I've attached it for you. You can run the script by opening a shell in $KEYCLOAK_HOME/modules then run:

# searchjar org/jboss/logging/Logger

or 

# searchjar org.jboss.logging.Logger

In this case I actually found the module needed easier with the searchjar script, it's org.jboss.logging you want, not org.jboss.logging.jboss-logging.

On 27 May 2016 at 08:38, Sarp Kaya <akaya@expedia.com> wrote:
Hi Stian,

Thanks for the response. How do you know that it belongs to sun.jdk module? I googled but I couldn’t find anything in regards to that.

I managed to get through all the issues, the last stage is adding the log and now I am stuck again. I’m asking how you find the module name  because now I am getting Caused by: java.lang.NoClassDefFoundError: org/jboss/logging/Logger error.

I tried adding <module name="org.jboss.logging.jboss-logging”/> to the module.xml but that didn’t solve the problem.

Kind Regards,
Sarp Kaya

From: Stian Thorgersen <sthorger@redhat.com>
Reply-To: "stian@redhat.com" <stian@redhat.com>
Date: Thursday, May 26, 2016 at 5:21 PM
To: Abdullah Sarp Kaya <akaya@expedia.com>
Cc: "keycloak-user@lists.jboss.org" <keycloak-user@lists.jboss.org>
Subject: Re: [keycloak-user] Using dependencies for an SPI provider

If you need additional dependencies in your provider please deploy it as a module, see docs and examples on how to do that. For the missing class you're module definition would need to include:

...
    <dependencies>
    <module name="sun.jdk" export="true" >
        <imports>
            <include path="sun/misc/Unsafe" />
        </imports>
    </module>
    </dependencies>
...

On 26 May 2016 at 09:14, Sarp Kaya <akaya@expedia.com> wrote:
Hi,

I am trying to extend an event listener and the example one works fine, which just prints out every event.
However I want to do something more complicated than that. So I added two more dependency on top of keycloak dependencies:
com.codahale.metrics:metrics-core and com.readytalk:metrics3-statsd

In my IDE I was able to develop fine, then maven packages it fine. I package it by including all the dependencies (so JAR file is like 6 MB), otherwise it won’t have the dependencies (I have tried that and it complained at the runtime saying it doesn’t have the class).

Then I start the keycloak service, it starts fine. I get an exception throw like below when I initially use the service (which is when the first event trigger happens):

 07:10:01,453 ERROR [io.undertow.request] (default task-6) UT005023: Exception handling request to /auth/realms/master/protocol/openid-connect/auth: org.jboss.resteasy.spi.UnhandledException: java.lang.NoClassDefFoundError: sun/misc/Unsafe
        at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:76)
        at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:212)
        at org.jboss.resteasy.core.SynchronousDispatcher.writeException(SynchronousDispatcher.java:168)
        at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:411)
        at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:202)
        at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:221)
        at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
        at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
        at org.keycloak.services.filters.KeycloakSessionServletFilter.doFilter(KeycloakSessionServletFilter.java:88)
        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
        at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
        at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
        at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
        at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
        at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
        at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
        at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
        at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
        at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
        at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
        at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
        at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
        at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
        at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284)
        at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)
        at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
        at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174)
        at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
        at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: sun/misc/Unsafe
        at com.codahale.metrics.Striped64.getUnsafe(Striped64.java:330)
        at com.codahale.metrics.Striped64.<clinit>(Striped64.java:311)
        at com.codahale.metrics.EWMA.<init>(EWMA.java:29)
        at com.codahale.metrics.EWMA.oneMinuteEWMA(EWMA.java:39)
        at com.codahale.metrics.Meter.<init>(Meter.java:15)
        at com.codahale.metrics.Meter.<init>(Meter.java:28)
        at com.codahale.metrics.MetricRegistry$MetricBuilder$3.newMetric(MetricRegistry.java:426)
        at com.codahale.metrics.MetricRegistry$MetricBuilder$3.newMetric(MetricRegistry.java:423)
        at com.codahale.metrics.MetricRegistry.getOrAdd(MetricRegistry.java:313)
        at com.codahale.metrics.MetricRegistry.meter(MetricRegistry.java:134)
        at com.expedia.keycloak.spi.providers.events.SysoutEventListenerProvider.<init>(SysoutEventListenerProvider.java:22)
        at com.expedia.keycloak.spi.providers.events.SysoutEventListenerProviderFactory.create(SysoutEventListenerProviderFactory.java:23)
        at com.expedia.keycloak.spi.providers.events.SysoutEventListenerProviderFactory.create(SysoutEventListenerProviderFactory.java:16)
        at org.keycloak.services.DefaultKeycloakSession.getProvider(DefaultKeycloakSession.java:115)
        at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.jboss.resteasy.core.ContextParameterInjector$GenericDelegatingProxy.invoke(ContextParameterInjector.java:56)
        at com.sun.proxy.$Proxy81.getProvider(Unknown Source)
        at org.keycloak.events.EventBuilder.<init>(EventBuilder.java:62)
        at org.keycloak.services.resources.RealmsResource.getProtocol(RealmsResource.java:98)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.jboss.resteasy.core.ResourceLocatorInvoker.createResource(ResourceLocatorInvoker.java:79)
        at org.jboss.resteasy.core.ResourceLocatorInvoker.createResource(ResourceLocatorInvoker.java:58)
        at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:100)
        at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:395)
        ... 37 more
Caused by: java.lang.ClassNotFoundException: sun.misc.Unsafe
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 66 more

I don’t know what could be wrong. When I googled the java.lang.NoClassDefFoundError with Keycloak I found that there was an error with Facebook integration. So I am wondering whether this is something similar and a bug with Keycloak? If not then what have I missed?

Kind Regards,
Sarp Kaya

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