org.apache.struts2.config

## Class DefaultBeanSelectionProvider

- java.lang.Object
- - org.apache.struts2.config.AbstractBeanSelectionProvider
  - - org.apache.struts2.config.DefaultBeanSelectionProvider

- All Implemented Interfaces:
    BeanSelectionProvider, ConfigurationProvider, ContainerProvider, PackageProvider

      public class DefaultBeanSelectionProvider
      extends AbstractBeanSelectionProvider

  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.factory.ActionFactory | struts.objectFactory.actionFactory | singleton | Dedicated factory used to create Actions, you can implement/extend existing one instead of defining new ObjectFactory
  com.opensymphony.xwork2.factory.ResultFactory | struts.objectFactory.resultFactory | singleton | Dedicated factory used to create Results, you can implement/extend existing one instead of defining new ObjectFactory
  com.opensymphony.xwork2.factory.InterceptorFactory | struts.objectFactory.interceptorFactory | singleton | Dedicated factory used to create Interceptors, you can implement/extend existing one instead of defining new ObjectFactory
  com.opensymphony.xwork2.factory.ConverterFactory | struts.objectFactory.converterFactory | singleton | Dedicated factory used to create TypeConverters, you can implement/extend existing one instead of defining new ObjectFactory
  com.opensymphony.xwork2.factory.ValidatorFactory | struts.objectFactory.validatorFactory | singleton | Dedicated factory used to create Validators, you can implement/extend existing one instead of defining new ObjectFactory
  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)
  com.opensymphony.xwork2.conversion.impl.XWorkConverter | struts.xworkConverter | singleton | Handles conversion logic and allows to load custom converters per class or per action
  com.opensymphony.xwork2.TextProvider | struts.xworkTextProvider | default | Allows provide custom TextProvider for whole application
  com.opensymphony.xwork2.LocaleProvider | struts.localeProvider | singleton | DEPRECATED! Allows provide custom TextProvider for whole application - instead this endpoint use struts.localeProviderFactory
  com.opensymphony.xwork2.LocaleProviderFactory | struts.localeProviderFactory | singleton | Allows provide custom LocaleProvider for whole application
  org.apache.struts2.components.UrlRenderer | struts.urlRenderer | singleton | Allows provide custom implementation of environment specific URL rendering/creating class
  com.opensymphony.xwork2.UnknownHandlerManager | struts.unknownHandlerManager | singleton | Implementation of this interface allows handle logic of unknown Actions, Methods or Results
  org.apache.struts2.views.util.UrlHelper | struts.view.urlHelper | singleton | Helper class used with URLRenderer to provide exact logic for building URLs
  com.opensymphony.xwork2.FileManagerFactory | struts.fileManagerFactory | singleton | Used to create `FileManager` instance to access files on the File System as also to monitor if reload is needed, can be implemented / overwritten to meet specific an application server needs
  com.opensymphony.xwork2.conversion.impl.CollectionConverter | struts.converter.collection | singleton | Converter used to convert any object to Collection and back
  com.opensymphony.xwork2.conversion.impl.ArrayConverter | struts.converter.array | singleton | Converter used to convert any object to Array and back
  com.opensymphony.xwork2.conversion.impl.DateConverter | struts.converter.date | singleton | Converter used to convert any object to Date and back
  com.opensymphony.xwork2.conversion.impl.NumberConverter | struts.converter.number | singleton | Converter used to convert any object to Number and back
  com.opensymphony.xwork2.conversion.impl.StringConverter | struts.converter.string | singleton | Converter used to convert any object to String and back
  com.opensymphony.xwork2.conversion.ConversionPropertiesProcessor | struts.conversion.properties.processor | singleton | Process Properties to create converters
  com.opensymphony.xwork2.conversion.ConversionPropertiesProcessor | struts.converter.file.processor | singleton | Process <class>-conversion.properties file create converters</class>
  com.opensymphony.xwork2.conversion.ConversionAnnotationProcessor | struts.converter.annotation.processor | singleton | Process TypeConversion annotation to create converters
  com.opensymphony.xwork2.conversion.TypeConverterCreator | struts.converter.creator | singleton | Creates user converters
  com.opensymphony.xwork2.conversion.TypeConverterHolder | struts.converter.holder | singleton | Holds user converters' instances
  com.opensymphony.xwork2.util.TextParser | struts.expression.parser | singleton | Used to parse expressions like ${foo.bar} or %{bar.foo} but it is up tp the TextParser's implementation what kind of opening char to use (#, $, %, etc)
  com.opensymphony.xwork2.ExcludedPatternsChecker | struts.excludedPatterns.checker | request | Used across different interceptors to check if given string matches one of the excluded patterns
  com.opensymphony.xwork2.AcceptedPatternsChecker | struts.acceptedPatterns.checker | request | Used across different interceptors to check if given string matches one of the accepted patterns
  org.apache.struts2.util.ContentTypeMatcher | struts.contentTypeMatcher | singleton | Matches content type of uploaded files (since 2.3.22)
  com.opensymphony.xwork2.LocalizedTextProvider | struts.localizedTextProvider | singleton | Provides access to resource bundles used to localise messages (since 2.5.11)

  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:

  - `struts.i18n.reload = true`
  - `struts.configuration.xml.reload = true`

- - ### Field Summary

    - ### Fields inherited from class org.apache.struts2.config.AbstractBeanSelectionProvider

      `DEFAULT_BEAN_NAME`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DefaultBeanSelectionProvider()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `register(ContainerBuilder builder, LocatableProperties props)` Registers beans and properties for the Container

    - ### Methods inherited from class org.apache.struts2.config.AbstractBeanSelectionProvider

      `alias, alias, convertIfExist, destroy, init, loadPackages, needsReload`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### DefaultBeanSelectionProvider

          public DefaultBeanSelectionProvider()

  - ### Method Detail

    - #### register

          public void register(ContainerBuilder builder,
                      LocatableProperties props)

      Description copied from interface: `ContainerProvider`
      Registers beans and properties for the Container
      Parameters:
        `builder` - The builder to register beans with
        `props` - The properties to register constants with

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