(I have checked already in the forum if this is a bug: https://community.jboss.org/message/832099)

In EAP 6.1 a package-info.java with a hibernate @TypeDef annotation is not processed, when deploying the war jboss reports a
  "MappingException: Could not determine type ...".

This issue happens with EAP 6.1 (tested on Linux/Fedora, should not be relevant). In contrast, with AS 7.1.1.Final and current wildfly master it's working as expected (UserTypes registered via @TypeDef on package-info.java are used by hibernate).
 
I've modified the hibernate4 sample that allows to reproduce the issue:
https://github.com/magro/jboss-as-quickstart/tree/master/hibernate4
(commit 9d0cd7d6 shows what's changed)
 
To reproduce the issue:
$ git clone git:magro/jboss-as-quickstart.git
$ cd jboss-as-quickstart/hibernate4
start your EAP 6.1 standalone
$ mvn clean package jboss-as:deploy
This fails with "org.hibernate.MappingException: Could not determine type for: org.jboss.as.quickstart.hibernate4.model.EmailAddress", log output (log output with TRACE level enabled for JPA is here: https://gist.github.com/magro/6250301/raw/6211afa2250b4fbf3102d83ebeddbbff9bd94fd3/jboss.log):

> 12:25:26,176 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-4) JBAS015876: Starting deployment of "jboss-as-hibernate4.war" (runtime-name: "jboss-as-hibernate4.war")
> 12:25:26,222 INFO  [org.jboss.as.jpa] (MSC service thread 1-14) JBAS011401: Read persistence.xml for primary
> 12:25:26,240 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-13) JBAS015877: Stopped deployment jboss-as-hibernate4.war (runtime-name: jboss-as-hibernate4.war) in 63ms
> 12:25:26,245 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-9) JBAS015876: Starting deployment of "jboss-as-hibernate4.war" (runtime-name: "jboss-as-hibernate4.war")
> 12:25:26,285 INFO  [org.jboss.as.jpa] (MSC service thread 1-5) JBAS011401: Read persistence.xml for primary
> 12:25:26,308 INFO  [org.jboss.as.connector.subsystems.datasources] (MSC service thread 1-6) JBAS010400: Bound data source [java:jboss/datasources/Hibernate4QuickstartDS]
> 12:25:26,319 INFO  [org.jboss.weld.deployer] (MSC service thread 1-10) JBAS016002: Processing weld deployment jboss-as-hibernate4.war
> 12:25:26,321 INFO  [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-10) JNDI bindings for session bean named MemberRegistration in deployment unit deployment "jboss-as-hibernate4.war" are as follows:
> 
> 
>         java:global/jboss-as-hibernate4/MemberRegistration!org.jboss.as.quickstart.hibernate4.service.MemberRegistration
>         java:app/jboss-as-hibernate4/MemberRegistration!org.jboss.as.quickstart.hibernate4.service.MemberRegistration
>         java:module/MemberRegistration!org.jboss.as.quickstart.hibernate4.service.MemberRegistration
>         java:global/jboss-as-hibernate4/MemberRegistration
>         java:app/jboss-as-hibernate4/MemberRegistration
>         java:module/MemberRegistration
> 
> 
> 12:25:26,353 INFO  [org.jboss.weld.deployer] (MSC service thread 1-4) JBAS016005: Starting Services for CDI deployment: jboss-as-hibernate4.war
> 12:25:26,363 INFO  [org.jboss.as.jpa] (ServerService Thread Pool -- 11) JBAS011402: Starting Persistence Unit Service 'jboss-as-hibernate4.war#primary'
> 12:25:26,364 INFO  [org.hibernate.ejb.Ejb3Configuration] (ServerService Thread Pool -- 11) HHH000204: Processing PersistenceUnitInfo [
>         name: primary
>         ...]
> 12:25:26,365 INFO  [org.jboss.weld.deployer] (MSC service thread 1-6) JBAS016008: Starting weld service for deployment jboss-as-hibernate4.war
> 12:25:26,386 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 11) MSC000001: Failed to start service jboss.persistenceunit."jboss-as-hibernate4.war#primary": org.jboss.msc.service.StartException in service jboss.persistenceunit."jboss-as-hibernate4.war#primary": javax.persistence.PersistenceException: [PersistenceUnit: primary] Unable to build EntityManagerFactory
>         at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:103)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_25]
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_25]
>         at java.lang.Thread.run(Thread.java:724) [rt.jar:1.7.0_25]
>         at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.1.0.Final-redhat-1.jar:2.1.0.Final-redhat-1]
> Caused by: javax.persistence.PersistenceException: [PersistenceUnit: primary] Unable to build EntityManagerFactory
>         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:930)
>         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904)
>         at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:92)
>         at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.createContainerEntityManagerFactory(PersistenceUnitServiceImpl.java:200)
>         at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.access$600(PersistenceUnitServiceImpl.java:57)
>         at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:99)
>         ... 4 more
> Caused by: org.hibernate.MappingException: Could not determine type for: org.jboss.as.quickstart.hibernate4.model.EmailAddress, at table: MemberHibernate4Demo, for columns: [org.hibernate.mapping.Column(email)]
>         at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:314)
>         at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:292)
>         at org.hibernate.mapping.Property.isValid(Property.java:239)
>         at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:469)
>         at org.hibernate.mapping.RootClass.validate(RootClass.java:270)
>         at org.hibernate.cfg.Configuration.validate(Configuration.java:1284)
>         at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742)
>         at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:94)
>         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:920)
>         ... 9 more
> 
> 
> 12:25:26,500 ERROR [org.jboss.as.server] (management-handler-thread - 1) JBAS015860: Redeploy of deployment "jboss-as-hibernate4.war" was rolled back with the following failure message: 
> {"JBAS014671: Failed services" => {"jboss.persistenceunit.\"jboss-as-hibernate4.war#primary\"" => "org.jboss.msc.service.StartException in service jboss.persistenceunit.\"jboss-as-hibernate4.war#primary\": javax.persistence.PersistenceException: [PersistenceUnit: primary] Unable to build EntityManagerFactory
>     Caused by: javax.persistence.PersistenceException: [PersistenceUnit: primary] Unable to build EntityManagerFactory
>     Caused by: org.hibernate.MappingException: Could not determine type for: org.jboss.as.quickstart.hibernate4.model.EmailAddress, at table: MemberHibernate4Demo, for columns: [org.hibernate.mapping.Column(email)]"}}


This happens because the package-info.java with the @TypeDef (for EmailAddress UserType) is not processed.
 
During debugging I found that in HibernateAnnotationScanner.getPackagesInJar some class.getPackage() returns null, because the underlying classloader does not know the package of the class.
This is the related call stack copied from eclipse's Debug view:

> TempClassLoader(ConcurrentClassLoader).findLoadedPackage(String) line: 499
> TempClassLoader(ConcurrentClassLoader).getPackageByName(String) line: 477
> TempClassLoader(ConcurrentClassLoader).getPackage(String) line: 465
> Package.getPackage(Class<?>) line: 332
> Class<T>.getPackage() line: 717
> HibernateAnnotationScanner.getPackagesInJar(URL, Set<Class<Annotation>>) line: 182
> Ejb3Configuration.addScannedEntries(ScanningContext, List<String>, List<String>, List<NamedInputStream>, List<String>) line: 491
> Ejb3Configuration.scanForClasses(ScanningContext, List<String>, List<String>, List<NamedInputStream>) line: 866
> Ejb3Configuration.configure(PersistenceUnitInfo, Map) line: 605
> HibernatePersistence.createContainerEntityManagerFactory(PersistenceUnitInfo, Map) line: 91
 
 
The TempClassLoader asked to findLoadedPackage(String) contains a packages field (Map<String, Package>), which is plain empty.
I haven't debugged further why there are no packages defined in the classloader (should happen via definePackage), perhaps it's just the wrong classloader that's used.