[LaLiLuna]

Hello,
I have just added an free EJB 3 tutorial to my website. It shows the complete setup with MyEclipse.

The use of entity beans and a stateless beans is explained step by step.
I am going to add a Ant setup, a setup for other application server as soon as possible.

Another tutorial showing Struts and EJB 3 is nearly finished as well.

Best Regards

Sebastian
Hibernate 3 Developer Guide eBook<br>
Tutorials for JSP, JavaServer Faces, Struts, Hibernate and EJB<br>
Training and Education at reasonable prices<br>
Find out more at http://www.laliluna.de

[Riyad Kalla]

Sebastian,
This is excellent news, a lot of our users rely on your tutorials to help them learn technologies and tools which is no small feat.

Do you have a direct link to the tutorial? I checked the English Tutorial section and didn’t see one from March ’06 for EJB in the EJB section, maybe I missed it?

[LaLiLuna]

Hello,

here is the link.
http://www.laliluna.de/EJB-3-tutorials.html

Regards Sebastian

[Riyad Kalla]

Great, I will make this thread sticky as I know a lot of folks have been wanting this.

[bryantan]

It’s great. Thank you Sebastian very much!

[safiqksm]

Thank you for your contributions.It’s really helpful for us to learn new technologies.

[Pat Osterday]

Thanks for the tutorial! I’ve learned a lot from the LaLiLuna site. One recommendation I’d make is to add the import (import javax.persistence.*;) to the Book class since it says “this is our full source code now”. Since I didn’t download the source code at first, I was confused by the errors MyEclipse was giving me before adding the import statement.

Also, for MySQL, you can use @GeneratedValue(strategy = GenerationType.AUTO) and remove the @SequenceGenerator annotation – that worked for me.

You can get by with a lot less included libs – I couldn’t find some of them, like qdox.jar, but it worked without them.

Thanks again!

[Pat Osterday]

Just a little info on which libs are needed… My “EJB3” user lib only has ejb3-persistence.jar and jboss-ejb3x.jar – for Entity and Session beans, this is all I’ve needed so far. For my “JBoss4-Client” user lib, I’ve got a screenshot here: http://www.market-assist.com/~osterday/pics/screenshots/ejb3-userlibs.png.

Thanks again for the great work Sebastian! (I hope to donate soon!)

-Pat

[Russ]

First of all, thank you for a nice tutorial. I am sure I would have not gotten up the learning curve without your insight.

I am working through your EJB3.0 Ant Tutorial. I have been successful in getting this EJB project to deploy properly in JBOSS4.0.3SP1. In one case I had to strip out the EJB 2.1 jars and conf xml file and drop in the EJB3.0 stuff to make the server work. I know it was not part of your tutorial and JBOS gives some clear instructions on what to do. 🙂

Here are some things you might want to look at when you update your tutorial.

1. Creating a Java Project vs. an EJB Project. Your instructions call for creating a Java Project, but your Screen shot shows you created an EJB Project.

2. The Book class is missing the import statments for the javax.persistence.* classes.

3. In the session bean add the unitName attribute in the annotation. I changed my around some, just to be different 😉

         @PersistenceContext(unitName="Ejb3Demo")
        

I sure these errors are just the difference between the current code today and the code you used back when you originally created the tutorial.

Again, thank you for putting together a nice aritcle. I look forward to finishing it and moving onto others.

Russ

[Scott Anderson]

Russ,

Thanks very much for the feedback; you’ve provided some valuable insights. We’ll be sure the authors see it when we update it next.

[laguiz]

Hi,

I have problemes with annotations …

I have problemes with :

@Entity
@Table(name="book")
@SequenceGenerator(name = "book_sequence", sequenceName = "book_id_seq")
public class Book implements Serializable {

Error is :

Entity cannot be resolved to a type

But I haven’t with

@Override
    public String toString() {

Why ? strange …

Can you help me ?

Thanks !!

[laguiz]

Lol I’m sorry for spam …

import javax.persistence.*;

—>[- ]

thanks Sebastian ^^

[laguiz]

I can’t see my Bean in JNDI View

I have look source but …

Problems with XDoclet ?

[Pat Osterday]

laguiz, check your jboss log file to make sure your deployment was successful – sometimes jboss problems don’t show up in the console window and you have to check the log. With ejb3, I’m pretty sure there is no need to run XDoclet.

[laguiz]

I found the solution.

Log file :

16:02:33,393 INFO [Ejb3AnnotationHandler] found EJB3: ejbName=BookTestBean, class=de.laliluna.library.BookTestBean, type=STATELESS
16:02:34,054 FATAL [PersistenceXmlLoader] FirstEjb3Tutorial JTA
16:02:34,085 INFO [Ejb3Deployment] EJB3 deployment time took: 1258
16:02:34,117 INFO [JmxKernelAbstraction] installing MBean: persistence.units:jar=FirstEJB3Tutorial.jar.jar,unitName=FirstEjb3Tutorial with dependencies:
16:02:34,117 INFO [JmxKernelAbstraction] jboss.jca:name=DefaultDS,service=ManagedConnectionFactory
16:02:34,447 INFO [Environment] Hibernate 3.1.2
16:02:34,478 INFO [Environment] hibernate.properties not found
16:02:34,494 INFO [Environment] using CGLIB reflection optimizer
16:02:34,494 INFO [Environment] using JDK 1.4 java.sql.Timestamp handling
16:02:35,296 INFO [Ejb3Configuration] found EJB3 Entity bean: de.laliluna.library.Book
16:02:36,523 INFO [AnnotationBinder] Binding entity from annotated class: de.laliluna.library.Book
16:02:36,822 INFO [EntityBinder] Bind entity de.laliluna.library.Book on table book
16:02:37,923 INFO [ConnectionProviderFactory] Initializing connection provider: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider
16:02:37,939 INFO [InjectedDataSourceConnectionProvider] Using provided datasource
16:02:37,939 INFO [SettingsFactory] RDBMS: MySQL, version: 4.1.9-nt
16:02:37,939 INFO [SettingsFactory] JDBC driver: MySQL-AB JDBC Driver, version: mysql-connector-java-3.1.12 ( $Date: 2005-11-17 15:53:48 +0100 (Thu, 17 Nov 2005) $, $Revision$ )
16:02:38,065 INFO [Dialect] Using dialect: org.hibernate.dialect.MySQLDialect
16:02:38,112 INFO [TransactionFactoryFactory] Using default transaction strategy (direct JDBC transactions)
16:02:38,159 INFO [TransactionManagerLookupFactory] instantiating TransactionManagerLookup: org.hibernate.transaction.JBossTransactionManagerLookup
16:02:38,254 INFO [TransactionManagerLookupFactory] instantiated TransactionManagerLookup
16:02:38,254 INFO [SettingsFactory] Automatic flush during beforeCompletion(): enabled
16:02:38,254 INFO [SettingsFactory] Automatic session close at end of transaction: disabled
16:02:38,254 INFO [SettingsFactory] JDBC batch size: 15
16:02:38,254 INFO [SettingsFactory] JDBC batch updates for versioned data: disabled
16:02:38,269 INFO [SettingsFactory] Scrollable result sets: enabled
16:02:38,269 INFO [SettingsFactory] JDBC3 getGeneratedKeys(): enabled
16:02:38,269 INFO [SettingsFactory] Connection release mode: after_statement
16:02:38,269 INFO [SettingsFactory] Maximum outer join fetch depth: 2
16:02:38,269 INFO [SettingsFactory] Default batch fetch size: 1
16:02:38,269 INFO [SettingsFactory] Generate SQL with comments: disabled
16:02:38,269 INFO [SettingsFactory] Order SQL updates by primary key: disabled
16:02:38,269 INFO [SettingsFactory] Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
16:02:38,301 INFO [ASTQueryTranslatorFactory] Using ASTQueryTranslatorFactory
16:02:38,301 INFO [SettingsFactory] Query language substitutions: {}
16:02:38,301 INFO [SettingsFactory] Second-level cache: enabled
16:02:38,301 INFO [SettingsFactory] Query cache: disabled
16:02:38,301 INFO [SettingsFactory] Cache provider: org.hibernate.cache.HashtableCacheProvider
16:02:38,317 INFO [SettingsFactory] Optimize cache for minimal puts: disabled
16:02:38,317 INFO [SettingsFactory] Structured second-level cache entries: disabled
16:02:38,348 INFO [SettingsFactory] Statistics: disabled
16:02:38,348 INFO [SettingsFactory] Deleted entity synthetic identifier rollback: disabled
16:02:38,364 INFO [SettingsFactory] Default entity-mode: pojo
16:02:38,553 INFO [SessionFactoryImpl] building session factory
16:02:38,710 WARN [ServiceController] Problem starting service persistence.units:jar=FirstEJB3Tutorial.jar.jar,unitName=FirstEjb3Tutorial
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.ejb3.ServiceDelegateWrapper.startService(ServiceDelegateWrapper.java:97)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:260)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:974)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:417)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:260)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:190)
at $Proxy41.start(Unknown Source)
at org.jboss.ejb3.JmxKernelAbstraction.install(JmxKernelAbstraction.java:76)
at org.jboss.ejb3.Ejb3Deployment.startPersistenceUnits(Ejb3Deployment.java:599)
at org.jboss.ejb3.Ejb3Deployment.start(Ejb3Deployment.java:452)
at org.jboss.ejb3.Ejb3Module.startService(Ejb3Module.java:139)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:260)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:974)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:417)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:260)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:190)
at $Proxy28.start(Unknown Source)
at org.jboss.ejb3.EJB3Deployer.start(EJB3Deployer.java:365)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1007)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:808)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:771)
at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:260)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:190)
at $Proxy6.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:334)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:522)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:207)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:218)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:197)
Caused by: org.hibernate.MappingException: could not instantiate id generator
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:97)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:152)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:181)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1176)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:414)
at org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:575)
at org.hibernate.ejb.Ejb3Configuration.createContainerEntityManagerFactory(Ejb3Configuration.java:245)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:108)
at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:260)
… 77 more
Caused by: org.hibernate.MappingException: Dialect does not support sequences
at org.hibernate.dialect.Dialect.getSequenceNextValString(Dialect.java:528)
at org.hibernate.id.SequenceGenerator.configure(SequenceGenerator.java:65)
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:93)
… 85 more
16:02:38,914 INFO [JmxKernelAbstraction] installing MBean: jboss.j2ee:service=EJB3,jar=FirstEJB3Tutorial.jar,name=BookTestBean with dependencies:
16:02:38,914 INFO [JmxKernelAbstraction] persistence.units:jar=FirstEJB3Tutorial.jar.jar,unitName=FirstEjb3Tutorial
16:02:38,946 INFO [EJB3Deployer] Deployed: file:/C:/Program Files/jboss-4.0.4RC1/server/default/deploy/FirstEJB3Tutorial.jar
16:02:38,946 ERROR [URLDeploymentScanner] Incomplete Deployment listing:

— MBeans waiting for other MBeans —
ObjectName: persistence.units:jar=FirstEJB3Tutorial.jar.jar,unitName=FirstEjb3Tutorial
State: FAILED
Reason: java.lang.reflect.InvocationTargetException
I Depend On:
jboss.jca:service=ManagedConnectionFactory,name=DefaultDS
Depends On Me:
jboss.j2ee:service=EJB3,jar=FirstEJB3Tutorial.jar,name=BookTestBean

ObjectName: jboss.j2ee:service=EJB3,jar=FirstEJB3Tutorial.jar,name=BookTestBean
State: NOTYETINSTALLED
I Depend On:
persistence.units:jar=FirstEJB3Tutorial.jar.jar,unitName=FirstEjb3Tutorial

— MBEANS THAT ARE THE ROOT CAUSE OF THE PROBLEM —
ObjectName: persistence.units:jar=FirstEJB3Tutorial.jar.jar,unitName=FirstEjb3Tutorial
State: FAILED
Reason: java.lang.reflect.InvocationTargetException
I Depend On:
jboss.jca:service=ManagedConnectionFactory,name=DefaultDS
Depends On Me:
jboss.j2ee:service=EJB3,jar=FirstEJB3Tutorial.jar,name=BookTestBean

Problem in my class :

...
@Entity
@Table(name="book")
@SequenceGenerator(name = "book_sequence", sequenceName = "book_id_seq")
public class Book implements Serializable {
...

Change :

@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "book_sequence") 

by

@GeneratedValue(strategy = GenerationType.AUTO, generator = "book_sequence")

It’s ok now.

I work with MySQL.
Wy we can’t use GenerationType.SEQUENCE with MySQL (if probleme is MySQL) ?

[Author]

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