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Chapter 31. Built-in Seam components

31.1. Context injection components
31.2. Utility components
31.3. Components for internationalization and themes
31.4. Components for controlling conversations
31.5. jBPM-related components
31.6. Security-related components
31.7. JMS-related components
31.8. Mail-related components
31.9. Infrastructural components
31.10. Miscellaneous components
31.11. Special components

This chapter describes Seam's built-in components, and their configuration properties. The built-in components will be created even if they are not listed in your components.xml file, but if you need to override default properties or specify more than one component of a certain type, components.xml is used.

Note that you can replace any of the built in components with your own implementations simply by specifying the name of one of the built in components on your own class using @Name.

The first set of built in components exist purely to support injection of various contextual objects. For example, the following component instance variable would have the Seam session context object injected:

@In private Context sessionContext;

All of these components are always installed.

These components are merely useful.

org.jboss.seam.faces.facesMessages

Allows faces success messages to propagate across a browser redirect.

org.jboss.seam.faces.redirect

A convenient API for performing redirects with parameters (this is especially useful for bookmarkable search results screens).

org.jboss.seam.faces.httpError

A convenient API for sending HTTP errors.

org.jboss.seam.core.events

An API for raising events that can be observed via @Observer methods, or method bindings in components.xml.

org.jboss.seam.core.interpolator

An API for interpolating the values of JSF EL expressions in Strings.

org.jboss.seam.core.expressions

An API for creating value and method bindings.

org.jboss.seam.core.pojoCache

Manager component for a JBoss Cache PojoCache instance.

All of these components are always installed.

The next group of components make it easy to build internationalized user interfaces using Seam.

org.jboss.seam.core.locale

The Seam locale.

org.jboss.seam.international.timezone

The Seam timezone. The timezone is session scoped.

org.jboss.seam.core.resourceBundle

The Seam resource bundle. The resource bundle is stateless. The Seam resource bundle performs a depth-first search for keys in a list of Java resource bundles.

org.jboss.seam.core.resourceLoader

The resource loader provides access to application resources and resource bundles.

org.jboss.seam.international.localeSelector

Supports selection of the locale either at configuration time, or by the user at runtime.

org.jboss.seam.international.timezoneSelector

Supports selection of the timezone either at configuration time, or by the user at runtime.

org.jboss.seam.international.messages

A map containing internationalized messages rendered from message templates defined in the Seam resource bundle.

org.jboss.seam.theme.themeSelector

Supports selection of the theme either at configuration time, or by the user at runtime.

org.jboss.seam.theme.theme

A map containing theme entries.

All of these components are always installed.

The next group of components allow control of conversations by the application or user interface.

org.jboss.seam.core.conversation

API for application control of attributes of the current Seam conversation.

org.jboss.seam.core.conversationList

Manager component for the conversation list.

org.jboss.seam.core.conversationStack

Manager component for the conversation stack (breadcrumbs).

org.jboss.seam.faces.switcher

The conversation switcher.

All of these components are always installed.

These components are for use with jBPM.

org.jboss.seam.pageflow.pageflow

API control of Seam pageflows.

org.jboss.seam.bpm.actor

API for application control of attributes of the jBPM actor associated with the current session.

org.jboss.seam.bpm.transition

API for application control of the jBPM transition for the current task.

org.jboss.seam.bpm.businessProcess

API for programmatic control of the association between the conversation and business process.

org.jboss.seam.bpm.taskInstance

Manager component for the jBPM TaskInstance.

org.jboss.seam.bpm.processInstance

Manager component for the jBPM ProcessInstance.

org.jboss.seam.bpm.jbpmContext

Manager component for an event-scoped JbpmContext.

org.jboss.seam.bpm.taskInstanceList

Manager component for the jBPM task list.

org.jboss.seam.bpm.pooledTaskInstanceList

Manager component for the jBPM pooled task list.

org.jboss.seam.bpm.taskInstanceListForType

Manager component for the jBPM task lists.

org.jboss.seam.bpm.pooledTask

Action handler for pooled task assignment.

org.jboss.seam.bpm.processInstanceFinder

Manager for the process instance task list.

org.jboss.seam.bpm.processInstanceList

The process instance task list.

All of these components are installed whenever the component org.jboss.seam.bpm.jbpm is installed.

These components relate to web-tier security.

These components are for use with managed TopicPublishers and QueueSenders (see below).

These components are for use with Seam's Email support

These components provide critical platform infrastructure. You can install a component which isn't installed by default by setting install="true" on the component in components.xml.

org.jboss.seam.core.init

Initialization settings for Seam. Always installed.

org.jboss.seam.core.manager

Internal component for Seam page and conversation context management. Always installed.

org.jboss.seam.navigation.pages

Internal component for Seam workspace management. Always installed.

org.jboss.seam.bpm.jbpm

Bootstraps a JbpmConfiguration. Install as class org.jboss.seam.bpm.Jbpm.

org.jboss.seam.core.conversationEntries

Internal session-scoped component recording the active long-running conversations between requests.

org.jboss.seam.faces.facesPage

Internal page-scoped component recording the conversation context associated with a page.

org.jboss.seam.persistence.persistenceContexts

Internal component recording the persistence contexts which were used in the current conversation.

org.jboss.seam.jms.queueConnection

Manages a JMS QueueConnection. Installed whenever managed managed QueueSender is installed.

org.jboss.seam.jms.topicConnection

Manages a JMS TopicConnection. Installed whenever managed managed TopicPublisher is installed.

org.jboss.seam.persistence.persistenceProvider

Abstraction layer for non-standardized features of JPA provider.

org.jboss.seam.core.validators

Caches instances of Hibernate Validator ClassValidator.

org.jboss.seam.faces.validation

Allows the application to determine whether validation failed or was successful.

org.jboss.seam.debug.introspector

Support for the Seam Debug Page.

org.jboss.seam.debug.contexts

Support for the Seam Debug Page.

org.jboss.seam.exception.exceptions

Internal component for exception handling.

org.jboss.seam.transaction.transaction

API for controlling transactions and abstracting the underlying transaction management implementation behind a JTA-compatible interface.

org.jboss.seam.faces.safeActions

Decides if an action expression in an incoming URL is safe. This is done by checking that the action expression exists in the view.

These components don't fit into

Certain special Seam component classes are installable multiple times under names specified in the Seam configuration. For example, the following lines in components.xml install and configure two Seam components:


<component name="bookingDatabase"
          class="org.jboss.seam.persistence.ManagedPersistenceContext">
    <property name="persistenceUnitJndiName">java:/comp/emf/bookingPersistence</property>
</component>

<component name="userDatabase"
          class="org.jboss.seam.persistence.ManagedPersistenceContext">
    <property name="persistenceUnitJndiName">java:/comp/emf/userPersistence</property>
</component>

The Seam component names are bookingDatabase and userDatabase.

<entityManager>, org.jboss.seam.persistence.ManagedPersistenceContext

Manager component for a conversation scoped managed EntityManager with an extended persistence context.

<entityManagerFactory>, org.jboss.seam.persistence.EntityManagerFactory

Manages a JPA EntityManagerFactory. This is most useful when using JPA outside of an EJB 3.0 supporting environment.

See the API JavaDoc for further configuration properties.

<session>, org.jboss.seam.persistence.ManagedSession

Manager component for a conversation scoped managed Hibernate Session.

<sessionFactory>, org.jboss.seam.persistence.HibernateSessionFactory

Manages a Hibernate SessionFactory.

See the API JavaDoc for further configuration properties.

<managedQueueSender>, org.jboss.seam.jms.ManagedQueueSender

Manager component for an event scoped managed JMS QueueSender.

<managedTopicPublisher>, org.jboss.seam.jms.ManagedTopicPublisher

Manager component for an event scoped managed JMS TopicPublisher.

<managedWorkingMemory>, org.jboss.seam.drools.ManagedWorkingMemory

Manager component for a conversation scoped managed Drools WorkingMemory.

<ruleBase>, org.jboss.seam.drools.RuleBase

Manager component for an application scoped Drools RuleBase. Note that this is not really intended for production usage, since it does not support dynamic installation of new rules.

<entityHome>, org.jboss.seam.framework.EntityHome

<hibernateEntityHome>, org.jboss.seam.framework.HibernateEntityHome

<entityQuery>, org.jboss.seam.framework.EntityQuery

<hibernateEntityQuery>, org.jboss.seam.framework.HibernateEntityQuery