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Built with Seam

You can find the full source code for this website in the Seam package in the directory /examples/wiki. It is licensed under the LGPL.

Please Note - This FAQ is for Seam 2 only!!

Please pick an FAQ category and select a question or browse the table of contents:

Product Evaluation

Can I use AJAX with Seam?

Can I unit test Seam applications without starting the Application Server?

What's so special about Seam's state management?

Does Seam support multiple browser windows or tabs?

Can Seam handle back-button navigation?

Does Seam support REST style bookmarkable URLs?

Can I do redirect-after-post or even GET in the same conversation?

Can I use Seam in a portal?

Does Seam have something like the Ruby on Rails "flash" object?

Does Seam have continuations?

Does Seam support internationalization?

Are there any development tools that support Seam?

Does Seam provide any JSF components?

Do I have to use EJB 3 to use Seam?

Can I have multiple Seam WAR modules in a single EAR?

Is there a Maven 2 project template for Seam applications?

Do you have any performance tuning advice?

Seam Requirements

What version of JBoss Application Server do I need to run Seam?

Do I need JBoss Application Server to run Seam?

Can I run Seam in a J2EE 1.4 environment?

What JDK version do I need for Seam?

Does Seam work with JDK 6.0?

How does the JBoss AS 5 - Seam integration work?

Does Seam work with JSF 2?

Seam Core

Why do I get a ConcurrentModificationException when my Seam application is under load?

Why do I get "value of context variable is not an instance of the component bound to the context variable"?

Why do I get a TypeNotPresentException, causing Seam to fail at startup?

Do I need to worry about concurrency in session or conversation-scoped components?

Expression Language

What is an Expression Language (EL)?

How about an example?

What else can the EL do?

What are the Java EL specifications?

What technologies use which EL?

Why do some expressions start with pound symbol and others start with dollar sign?

What is the difference between a MethodExpression and a ValueExpression?

Can I specify arguments for a MethodExpression myself?

What is an EL Variable?

What is an EL Function?

Can it lookup in other places besides PageContext, request, session, and application?

How do I interpolate the value of a message key from Java?

Component Design

How can I access the HttpServletRequest or HttpSession directly?

Bijection

Can I hold a reference to a Seam component (such as in a list)?

Why isn't bijection run on internal method calls?

Components and Contexts

When does the page context get destroyed?

How does page scope differ from a temporary conversation?

What's the purpose of the method context?

Transactions and persistence

When do I use @In vs @PersistenceContext to inject an EntityManager?

How do you hide the transaction failed faces message?

How do I use an alternate JPA provider?

How do I use JDBC with Seam?

Why does MANUAL flushMode not work when persisting an Entity

Testing

How can I run Seam only once per test suite?

What is the difference between SeamTest and JSFUnit?

How do I use a different database with Embedded JBoss?

JSF and Facelets

How can I operate on Strings in my templates?

Why does JSF call my getter hundreds of times?

I'm getting an IAE or the value not getting selected when using a select box

I get Value is not a valid option when using s:selectItems and s:convertEntity, or a custom converter

I get 'The conversation ended, timed out or was processing another request' with AJAX

Why is commented code in my XHTML file executed?

How do I concat strings in Facelets templates?

How can I disable conversation identifiers for robots crawling my site?

I get "The entity name must immediately follow the '&' in the entity reference."

Why isn't my bean created?

How does the default locale work? When is it used?

How can I find out the current JSF phase?

How do I comment out blocks of markup in Facelets?

How do a prevent an page action from executing on postback?

How can I display the Hibernate validator failures that happen on persist or update?

How do I load a Facelets view template from a shared JAR?

Users are seeing a ViewExpiredException when clicking on stale pages. How can I prevent this?

I'm on a Mac. Why does org.jboss.Main gain focus when my app starts?

Where can I find information about JSF?

Is there an equivalent to Seam's s:selectItems in JSF 2?

Tooling

How can I control publishing of code changes to the server?

How can I force restart of the web application?

How do I get started developing a Seam application with JBoss Tools?

How do I reverse engineer from multiple schemas?

Why do seam-gen projects have two source directories?

Why do I see duplicate associations after reverse engineering?

Why can't JBoss Tools find the persistence unit of a seam-gen project?

Weld

I get an NPE in EjbDiscoveryEnvironment when starting JBoss AS

How do I do non-contextual injection for a thirdparty framework?

How do I run functional tests on Weld examples?

How do I test Weld archetypes?

Why does Weld leave some proxy class definitions lying around when I undeploy my application? How can I prevent this?

Some of my beans aren't deployed and I can't see why?

How do I see what beans have been deployed?

If I create a thread in my CDI bean, how will Weld react?

seamframework.org

How do I get seamframework.org to work in Opera?

Deployment

What happens when you deploy Seam app in JBoss5?

jBPM

Why does deployment fail with a SAX exception?

CDI

How do a resolve an AmbiguousResolutionException between a producer method and a raw type?

Where can I find the JavaDoc for all of Java EE 6?

Where is the XSD for beans.xml located?

Can I share information between observers in an Extension?

What is beans.xml and why do I need it?

When are interceptors and decorators applied?

What is the purpose of the @Model annotation?

Why is the constructor invoked twice when a normal scoped bean is created?

Why is there no active transaction in my SFSB transactional observer?

How do I use the conversation scope with JSF 2?

Should I use javax.faces.bean.SessionScoped or javax.enterprise.context.SessionScoped?

Why is @Veto a best practice for persistent (JPA) entities?

Why does my normal scoped bean not get instantiated immediately?