Ambiguous dependencies for type EntityManager with qualifiers @Default

Não estou conseguindo subir a minha aplicação, pois sempre tenho esse erro.

Meu log atualmente:

`    GRAVE: Exception sending context initialized event to listener instance of class org.jboss.weld.environment.servlet.Listener
    org.jboss.weld.exceptions.DeploymentException: Exception List with 3 exceptions:
    Exception 0 :
    org.jboss.weld.exceptions.DeploymentException: WELD-001409: Ambiguous dependencies for type EntityManager with qualifiers @Default
      at injection point [BackedAnnotatedParameter] Parameter 1 of [BackedAnnotatedConstructor] @Inject public br.com.caelum.vraptor.jpa.JPATransactionInterceptor(EntityManager, Validator, MutableResponse)
      at br.com.caelum.vraptor.jpa.JPATransactionInterceptor.<init>(JPATransactionInterceptor.java:0)
      Possible dependencies: 
      - Producer Method [EntityManager] with qualifiers [@Any @Default] declared as [[BackedAnnotatedMethod] @Produces @RequestScoped public br.com.caelum.vraptor.jpa.EntityManagerCreator.getEntityManager()],
      - Producer Method [EntityManager] with qualifiers [@Any @Default] declared as [[BackedAnnotatedMethod] @Produces @RequestScoped public br.com.marvin.reserva.produces.EntityManagerProduces.getEntityManager()]
    	at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:376)
    	at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:289)
    	at org.jboss.weld.bootstrap.Validator.validateGeneralBean(Validator.java:135)
    	at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:166)
    	at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:514)
    	at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(ConcurrentValidator.java:68)
    	at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(ConcurrentValidator.java:66)
    	at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:60)
    	at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:53)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    	at java.lang.Thread.run(Thread.java:745)
    Exception 0 :
    org.jboss.weld.exceptions.DeploymentException: WELD-001409: Ambiguous dependencies for type EntityManager with qualifiers @Default
      at injection point [BackedAnnotatedParameter] Parameter 1 of [BackedAnnotatedConstructor] @Inject public br.com.marvin.reserva.dao.ProfessorDao(EntityManager)
      at br.com.marvin.reserva.dao.ProfessorDao.<init>(ProfessorDao.java:0)
      Possible dependencies: 
      - Producer Method [EntityManager] with qualifiers [@Any @Default] declared as [[BackedAnnotatedMethod] @Produces @RequestScoped public br.com.caelum.vraptor.jpa.EntityManagerCreator.getEntityManager()],
      - Producer Method [EntityManager] with qualifiers [@Any @Default] declared as [[BackedAnnotatedMethod] @Produces @RequestScoped public br.com.marvin.reserva.produces.EntityManagerProduces.getEntityManager()]
    	at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:376)
    	at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:289)
    	at org.jboss.weld.bootstrap.Validator.validateGeneralBean(Validator.java:135)
    	at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:166)
    	at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:514)
    	at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(ConcurrentValidator.java:68)
    	at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(ConcurrentValidator.java:66)
    	at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:60)
    	at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:53)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    	at java.lang.Thread.run(Thread.java:745)
    Exception 0 :
    org.jboss.weld.exceptions.DeploymentException: WELD-001409: Ambiguous dependencies for type EntityManager with qualifiers @Default
      at injection point [BackedAnnotatedParameter] Parameter 1 of [BackedAnnotatedConstructor] @Inject public br.com.caelum.vraptor.jpa.extra.ParameterLoader(EntityManager, HttpServletRequest, ParameterNameProvider, Result, Converters, FlashScope)
      at br.com.caelum.vraptor.jpa.extra.ParameterLoader.<init>(ParameterLoader.java:0)
      Possible dependencies: 
      - Producer Method [EntityManager] with qualifiers [@Any @Default] declared as [[BackedAnnotatedMethod] @Produces @RequestScoped public br.com.caelum.vraptor.jpa.EntityManagerCreator.getEntityManager()],
      - Producer Method [EntityManager] with qualifiers [@Any @Default] declared as [[BackedAnnotatedMethod] @Produces @RequestScoped public br.com.marvin.reserva.produces.EntityManagerProduces.getEntityManager()]
    	at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:376)
    	at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:289)
    	at org.jboss.weld.bootstrap.Validator.validateGeneralBean(Validator.java:135)
    	at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:166)
    	at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:514)
    	at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(ConcurrentValidator.java:68)
    	at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(ConcurrentValidator.java:66)
    	at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:60)
    	at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:53)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    	at java.lang.Thread.run(Thread.java:745)
    	at org.jboss.weld.bootstrap.ConcurrentValidator.validateBeans(ConcurrentValidator.java:76)
    	at org.jboss.weld.bootstrap.Validator.validateDeployment(Validator.java:475)
    	at org.jboss.weld.bootstrap.WeldStartup.validateBeans(WeldStartup.java:392)
    	at org.jboss.weld.bootstrap.WeldBootstrap.validateBeans(WeldBootstrap.java:85)
    	at org.jboss.weld.environment.servlet.Listener.contextInitialized(Listener.java:170)
    	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4842)
    	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5303)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1407)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1397)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    	at java.lang.Thread.run(Thread.java:745)
    set 24, 2016 5:52:32 PM org.apache.catalina.core.StandardContext startInternal
    GRAVE: One or more listeners failed to start. Full details will be found in the appropriate container log file
    set 24, 2016 5:52:32 PM org.apache.catalina.core.StandardContext startInternal
    GRAVE: Context [/reserva] startup failed due to previous errors
    set 24, 2016 5:52:32 PM org.apache.catalina.core.StandardContext listenerStop
    GRAVE: Exception sending context destroyed event to listener instance of class org.jboss.weld.environment.servlet.Listener
    java.lang.NullPointerException
    	at org.jboss.weld.servlet.WeldInitialListener.contextDestroyed(WeldInitialListener.java:120)
    	at org.jboss.weld.servlet.api.helpers.ForwardingServletListener.contextDestroyed(ForwardingServletListener.java:30)
    	at org.jboss.weld.environment.servlet.Listener.contextDestroyed(Listener.java:85)
    	at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4889)
    	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5526)
    	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:224)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:159)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1407)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1397)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    	at java.lang.Thread.run(Thread.java:745)`

E aqui meu Produtor:
`package br.com.marvin.reserva.produces;

import javax.enterprise.context.RequestScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

    public class EntityManagerProduces {
        private EntityManagerFactory managerFactory = Persistence.createEntityManagerFactory("reserva_materiais");

        @Produces
        @RequestScoped
        public EntityManager getEntityManager() {
            return managerFactory.createEntityManager();
        }

        public void close(@Disposes EntityManager em) {
            em.close();
        }
    }

`

pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <modelVersion>4.0.0</modelVersion> <groupId>br.com.marvin</groupId> <artifactId>reserva</artifactId> <version>1.0.0-SNAPSHOT</version> <packaging>war</packaging> <properties> <maven.compiler.source>1.8</maven.compiler.source> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.target>1.8</maven.compiler.target> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.jboss.spec</groupId> <artifactId>jboss-javaee-6.0</artifactId> <version>3.0.2.Final</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.enterprise</groupId> <artifactId>cdi-api</artifactId> <version>1.1</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.jboss.weld</groupId> <artifactId>weld-core-impl</artifactId> <version>2.1.2.Final</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.jboss.weld.servlet</groupId> <artifactId>weld-servlet</artifactId> <version>2.1.2.Final</version> <scope>compile</scope> </dependency> <dependency> <groupId>br.com.caelum</groupId> <artifactId>vraptor</artifactId> <version>4.1.4</version> <scope>compile</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> <scope>compile</scope> </dependency> <dependency> <groupId>javax.inject</groupId> <artifactId>javax.inject</artifactId> <version>1</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator-cdi</artifactId> <version>5.1.1.Final</version> <scope>compile</scope> </dependency> <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> <version>1.1.0.Final</version> <scope>compile</scope> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>15.0</version> <scope>compile</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.el</groupId> <artifactId>javax.el-api</artifactId> <version>3.0.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>br.com.caelum.vraptor</groupId> <artifactId>vraptor-jpa</artifactId> <version>4.0.3</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>4.3.0.Final</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>4.3.0.Final</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.hibernate.javax.persistence</groupId> <artifactId>hibernate-jpa-2.1-api</artifactId> <version>1.0.0.Final</version> <scope>compile</scope> </dependency> </dependencies> <build> <plugins> <plugin> <artifactId>maven-war-plugin</artifactId> <version>2.4</version> <configuration> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration> </plugin> </plugins> </build> </project>
Alguém poderia me ajudar?

E como tivesse dois produces
O beans.xml está aí ?

sim.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <beans xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	bean-discovery-mode="all" version="1.1"
    	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd">
    	<decorators>
    		<class>br.com.caelum.vraptor.jpa.TransactionDecorator</class>
    	</decorators>
    </beans>

Por algum motivo não está indo completo…

Por algum motivo não, vc tá usando o plugin do vraptor do Jpa.
Você ao menos leu a documentação do mesmo ?
Provavelmente não, porque ela diz isso.
"O plugin VRaptor JPA cuida da criação e injeção de depedência da EntityManager e EntityManagerFactory.
Além disso, o plugin aplica o padrão Open EntityManager In View, isto
é, ele abre uma transação com o banco de dados no ínicio da requisição e
executa o commit da transação no fim da requisição."
E ainda assim, eles tem o código do mesmo no github, e essa classe também tem um produces igual o seu.

Ai quando vc pede um entity manager, o cdi não tem como adivinhar qual ele vai injetar, por isto da exception, e você tem anotações de @Default, @Alternative, que é para algumas situações.

Tinha conseguido resolver isso ontem. Era exatamente isso. Uma total falta dr atenção da minha parte. Obrigado pela resposta!