Tried to get work book examples to work with JBoss 5. Had to change buid.xml to use %JBOSS_HOME%/client in classpath instead of what was there.
Then example 4_1 would compile at least. When loaded in, got error

vfszip:/C:/apps/jboss-as-5.0.0.GA/server/default/deploy/titan.jar -> org.jboss.xb.binding.JBossXBRuntimeException: Failed to resolve schema nsURI= location=persistence


 at org.jboss.deployers.plugins.deployers.DeployersImpl.checkComplete(DeployersImpl.java:863)
 at org.jboss.deployers.plugins.main.MainDeployerImpl.checkComplete(MainDeployerImpl.java:665)
 at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:293)
 at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:221)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
 at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:280)
 at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:135)
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.j
ava:65)
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.
java:142)
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:166
)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
 at java.lang.Thread.run(Thread.java:595)

which was fixed by changing persistence.xml to

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence persistence_1_0.xsd ">
 <persistence-unit name="titan">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
 <jta-data-source>java:/DefaultDS</jta-data-source>
 <properties>
 <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
 <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
 </properties>
 </persistence-unit>
</persistence>

But according to ejb3 spec, the persistence.xml that was present should have worked:

<?xml version="1.0" encoding="UTF-8"?>
<persistence>
 <persistence-unit name="titan">
 <jta-data-source>java:/DefaultDS</jta-data-source>
 <properties>
 <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
 </properties>
 </persistence-unit>
</persistence>

When I successfully ran the example, got following warnings from JBOSS 5.0.0.GA:

16:56:03,671 WARN [InterceptorsFactory] EJBTHREE-1246: Do not use InterceptorsFactory with a ManagedObjectAdvisor, Inte
rceptorRegistry should be used via the bean container
16:56:03,671 WARN [InterceptorsFactory] EJBTHREE-1246: Do not use InterceptorsFactory with a ManagedObjectAdvisor, Inte
rceptorRegistry should be used via the bean container
16:56:03,671 WARN [InterceptorRegistry] applicable interceptors is non-existent for public void com.titan.travelagent.T
ravelAgentBean.createCabin(com.titan.domain.Cabin)
16:56:03,687 WARN [InterceptorRegistry] applicable interceptors is non-existent for public com.titan.domain.Cabin com.t
itan.travelagent.TravelAgentBean.findCabin(int)
16:56:03,687 WARN [InterceptorRegistry] applicable interceptors is non-existent for public void com.titan.travelagent.T
ravelAgentBean.createCabin(com.titan.domain.Cabin)
16:56:03,687 WARN [InterceptorRegistry] applicable interceptors is non-existent for public com.titan.domain.Cabin com.t
itan.travelagent.TravelAgentBean.findCabin(int)