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## javax.servlet
Interface Registration

All Known Subinterfaces:
  FilterRegistration, FilterRegistration.Dynamic, Registration.Dynamic, ServletRegistration, ServletRegistration.Dynamic

All Known Implementing Classes:
  FilterHolder.Registration, Holder.HolderRegistration, ServletHolder.Registration

    public interface Registration

Interface through which a `Servlet` or `Filter` may be further configured.

A Registration object whose `getClassName()` method returns null is considered preliminary. Servlets and Filters whose implementation class is container implementation specific may be declared without any `servlet-class` or `filter-class` elements, respectively, and will be represented as preliminary Registration objects. Preliminary registrations must be completed by calling one of the `addServlet` or `addFilter` methods on `ServletContext`, and passing in the Servlet or Filter name (obtained via `getName()`) along with the supporting Servlet or Filter implementation class name, Class object, or instance, respectively. In most cases, preliminary registrations will be completed by an appropriate, container-provided `ServletContainerInitializer`.

Since:
  Servlet 3.0

Nested Class Summary
`static interface` | `Registration.Dynamic` Interface through which a `Servlet` or `Filter` registered via one of the `addServlet` or `addFilter` methods, respectively, on `ServletContext` may be further configured.

Method Summary
`java.lang.String` | `getClassName()` Gets the fully qualified class name of the Servlet or Filter that is represented by this Registration.
`java.lang.String` | `getInitParameter(java.lang.String name)` Gets the value of the initialization parameter with the given name that will be used to initialize the Servlet or Filter represented by this Registration object.
`java.util.Map<java.lang.String,java.lang.String>` | `getInitParameters()` Gets an immutable (and possibly empty) Map containing the currently available initialization parameters that will be used to initialize the Servlet or Filter represented by this Registration object.
`java.lang.String` | `getName()` Gets the name of the Servlet or Filter that is represented by this Registration.
`boolean` | `setInitParameter(java.lang.String name, java.lang.String value)` Sets the initialization parameter with the given name and value on the Servlet or Filter that is represented by this Registration.
`java.util.Set<java.lang.String>` | `setInitParameters(java.util.Map<java.lang.String,java.lang.String> initParameters)` Sets the given initialization parameters on the Servlet or Filter that is represented by this Registration.

Method Detail

### getName

    java.lang.String getName()

  Gets the name of the Servlet or Filter that is represented by this Registration.

  Returns:
    the name of the Servlet or Filter that is represented by this Registration

### getClassName

    java.lang.String getClassName()

  Gets the fully qualified class name of the Servlet or Filter that is represented by this Registration.

  Returns:
    the fully qualified class name of the Servlet or Filter that is represented by this Registration, or null if this Registration is preliminary

### setInitParameter

    boolean setInitParameter(java.lang.String name,
                             java.lang.String value)

  Sets the initialization parameter with the given name and value on the Servlet or Filter that is represented by this Registration.

  Parameters:
    `name` - the initialization parameter name
    `value` - the initialization parameter value
  Returns:
    true if the update was successful, i.e., an initialization parameter with the given name did not already exist for the Servlet or Filter represented by this Registration, and false otherwise
  Throws:
    `java.lang.IllegalStateException` - if the ServletContext from which this Registration was obtained has already been initialized
    `java.lang.IllegalArgumentException` - if the given name or value is `null`

### getInitParameter

    java.lang.String getInitParameter(java.lang.String name)

  Gets the value of the initialization parameter with the given name that will be used to initialize the Servlet or Filter represented by this Registration object.

  Parameters:
    `name` - the name of the initialization parameter whose value is requested
  Returns:
    the value of the initialization parameter with the given name, or `null` if no initialization parameter with the given name exists

### setInitParameters

    java.util.Set<java.lang.String> setInitParameters(java.util.Map<java.lang.String,java.lang.String> initParameters)

  Sets the given initialization parameters on the Servlet or Filter that is represented by this Registration.

  The given map of initialization parameters is processed by-value, i.e., for each initialization parameter contained in the map, this method calls `setInitParameter(String,String)`. If that method would return false for any of the initialization parameters in the given map, no updates will be performed, and false will be returned. Likewise, if the map contains an initialization parameter with a `null` name or value, no updates will be performed, and an IllegalArgumentException will be thrown.

  Parameters:
    `initParameters` - the initialization parameters
  Returns:
    the (possibly empty) Set of initialization parameter names that are in conflict
  Throws:
    `java.lang.IllegalStateException` - if the ServletContext from which this Registration was obtained has already been initialized
    `java.lang.IllegalArgumentException` - if the given map contains an initialization parameter with a `null` name or value

### getInitParameters

    java.util.Map<java.lang.String,java.lang.String> getInitParameters()

  Gets an immutable (and possibly empty) Map containing the currently available initialization parameters that will be used to initialize the Servlet or Filter represented by this Registration object.

  Returns:
    Map containing the currently available initialization parameters that will be used to initialize the Servlet or Filter represented by this Registration object

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