Class BeanSelectionProvider

  extended by org.apache.struts2.config.BeanSelectionProvider
All Implemented Interfaces:
ConfigurationProvider, ContainerProvider, PackageProvider

public class BeanSelectionProvider
extends java.lang.Object
implements ConfigurationProvider

Selects the implementations of key framework extension points, using the loaded property constants. The implementations are selected from the container builder using the name defined in its associated property. The default implementation name will always be "struts".

The following is a list of the allowed extension points:

Type Property Scope Description
com.opensymphony.xwork2.ObjectFactory struts.objectFactory singleton Creates actions, results, and interceptors
com.opensymphony.xwork2.ActionProxyFactory struts.actionProxyFactory singleton Creates the ActionProxy
com.opensymphony.xwork2.util.ObjectTypeDeterminer struts.objectTypeDeterminer singleton Determines what the key and element class of a Map or Collection should be
org.apache.struts2.dispatcher.mapper.ActionMapper struts.mapper.class singleton Determines the ActionMapping from a request and a URI from an ActionMapping
org.apache.struts2.dispatcher.multipart.MultiPartRequest struts.multipart.parser per request Parses a multipart request (file upload)
org.apache.struts2.views.freemarker.FreemarkerManager struts.freemarker.manager.classname singleton Loads and processes Freemarker templates
org.apache.struts2.views.velocity.VelocityManager struts.velocity.manager.classname singleton Loads and processes Velocity templates
com.opensymphony.xwork2.validator.ActionValidatorManager struts.actionValidatorManager singleton Main interface for validation managers (regular and annotation based). Handles both the loading of configuration and the actual validation (since 2.1)
com.opensymphony.xwork2.util.ValueStackFactory struts.valueStackFactory singleton Creates value stacks (since 2.1)
com.opensymphony.xwork2.reflection.ReflectionProvider struts.reflectionProvider singleton Provides reflection services, key place to plug in a custom expression language (since 2.1)
com.opensymphony.xwork2.reflection.ReflectionContextFactory struts.reflectionContextFactory singleton Creates reflection context maps used for reflection and expression language operations (since 2.1)
com.opensymphony.xwork2.config.PackageProvider N/A singleton All beans registered as PackageProvider implementations will be automatically included in configuration building (since 2.1)
com.opensymphony.xwork2.util.PatternMatcher struts.patternMatcher singleton Matches patterns, such as action names, generally used in configuration (since 2.1)
org.apache.struts2.views.dispatcher.DefaultStaticContentLoader struts.staticContentLoader singleton Loads static resources (since 2.1)

Implementations are selected using the value of its associated property. That property is used to determine the implementation by:

  1. Trying to find an existing bean by that name in the container
  2. Trying to find a class by that name, then creating a new bean factory for it
  3. Creating a new delegation bean factory that delegates to the configured ObjectFactory at runtime

Finally, this class overrides certain properties if dev mode is enabled:

Field Summary
static java.lang.String DEFAULT_BEAN_NAME
Constructor Summary
Method Summary
 void destroy()
 void init(Configuration configuration)
 void loadPackages()
 boolean needsReload()
 void register(ContainerBuilder builder, LocatableProperties props)
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


public static final java.lang.String DEFAULT_BEAN_NAME
See Also:
Constant Field Values
Constructor Detail


public BeanSelectionProvider()
Method Detail


public void destroy()
Specified by:
destroy in interface ContainerProvider


public void loadPackages()
                  throws ConfigurationException
Specified by:
loadPackages in interface PackageProvider


public void init(Configuration configuration)
          throws ConfigurationException
Specified by:
init in interface ContainerProvider
Specified by:
init in interface PackageProvider


public boolean needsReload()
Specified by:
needsReload in interface ContainerProvider
Specified by:
needsReload in interface PackageProvider


public void register(ContainerBuilder builder,
                     LocatableProperties props)
Specified by:
register in interface ContainerProvider

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