@ApplicationScoped
public class LoadOnStartUpService {

    @Resource
    private UserTransaction userTransaction;

    public void loadStartups(@Observes @Priority(Interceptor.Priority.APPLICATION) Startup startup) {
      // startup stuff
    }
}

2025-07-15 11:35:06,956 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC000001: Failed to start service jboss.deployment.unit."xpe.ear".WeldEndInitService: org.jboss.msc.service.StartException in service jboss.deployment.unit."xpe.ear".WeldEndInitService: Failed to start service
        at org.jboss.msc@1.5.5.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1609)
        at org.jboss.msc@1.5.5.Final//org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1438)
        at org.jboss.threads@2.4.0.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
        at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
        at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
        at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
        at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.lang.IllegalArgumentException: WFLYWELD0049: Error injecting resource into Jakarta Contexts and Dependency Injection managed bean. Can't find a resource named java:comp/UserTransaction defined on private jakarta.transaction.UserTransaction com.foo.LoadOnStartUpService.userTransaction
        at org.jboss.as.weld@36.0.0.Final//org.jboss.as.weld.services.bootstrap.WeldResourceInjectionServices.resolveResource(WeldResourceInjectionServices.java:225)
        at org.jboss.as.weld@36.0.0.Final//org.jboss.as.weld.services.bootstrap.WeldResourceInjectionServices$1.createResource(WeldResourceInjectionServices.java:170)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.injection.AbstractResourceInjection.getResourceReference(AbstractResourceInjection.java:49)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.injection.AbstractResourceInjection.injectResourceReference(AbstractResourceInjection.java:63)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.util.Beans.injectEEFields(Beans.java:330)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.injection.producer.ResourceInjector$1.proceed(ResourceInjector.java:69)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.injection.InjectionContextImpl.run(InjectionContextImpl.java:49)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.injection.producer.ResourceInjector.inject(ResourceInjector.java:72)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.injection.producer.BasicInjectionTarget.inject(BasicInjectionTarget.java:126)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:165)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.contexts.AbstractContext.get(AbstractContext.java:96)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.bean.ContextualInstanceStrategy$DefaultContextualInstanceStrategy.get(ContextualInstanceStrategy.java:106)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.bean.ContextualInstanceStrategy$ApplicationScopedContextualInstanceStrategy.get(ContextualInstanceStrategy.java:152)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.bean.ContextualInstance.get(ContextualInstance.java:68)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.event.ObserverMethodImpl.getReceiver(ObserverMethodImpl.java:381)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.event.ObserverMethodImpl.getReceiverIfExists(ObserverMethodImpl.java:368)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:325)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:298)
        at jakarta.enterprise.api//jakarta.enterprise.inject.spi.ObserverMethod.notify(ObserverMethod.java:142)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.util.Observers.notify(Observers.java:176)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.event.ObserverNotifier.notifySyncObservers(ObserverNotifier.java:307)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.event.ObserverNotifier.notify(ObserverNotifier.java:293)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:185)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.bootstrap.BeanDeploymentModule.fireEvent(BeanDeploymentModule.java:100)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.bootstrap.WeldStartup.endInitialization(WeldStartup.java:587)
        at org.jboss.weld.core@5.1.5.Final//org.jboss.weld.bootstrap.WeldBootstrap.endInitialization(WeldBootstrap.java:101)
        at org.jboss.as.weld@36.0.0.Final//org.jboss.as.weld.WeldStartCompletionService.start(WeldStartCompletionService.java:62)
        at org.jboss.msc@1.5.5.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1617)
        at org.jboss.msc@1.5.5.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1580)
        ... 6 more
Caused by: javax.naming.NameNotFoundException: java:comp/UserTransaction
        at org.jboss.as.naming@36.0.0.Final//org.jboss.as.naming.InitialContext$DefaultInitialContext.findContext(InitialContext.java:174)
        at org.jboss.as.naming@36.0.0.Final//org.jboss.as.naming.InitialContext$DefaultInitialContext.lookup(InitialContext.java:218)
        at org.jboss.as.naming@36.0.0.Final//org.jboss.as.naming.NamingContext.lookup(NamingContext.java:176)
        at org.jboss.as.naming@36.0.0.Final//org.jboss.as.naming.NamingContext.lookup(NamingContext.java:172)
        at java.naming/javax.naming.InitialContext.lookup(InitialContext.java:409)
        at java.naming/javax.naming.InitialContext.lookup(InitialContext.java:409)
        at org.jboss.as.weld@36.0.0.Final//org.jboss.as.weld.services.bootstrap.WeldResourceInjectionServices.resolveResource(WeldResourceInjectionServices.java:223)
        ... 34 more