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# Package Configuration

Packages are a way to group actions, results, result types, interceptors, and interceptor-stacks into a logical configuration unit. Conceptually, packages are similar to objects in that they can be extended and have individual parts that can be overridden by “sub” packages.

## Packages

The package element has one required attribute `name`, which acts as the key for later reference to the package. The `extends` attribute is optional and allows one package to inherit the configuration of one or more previous packages

- including all interceptor, interceptor-stack, and action configurations.

> Note that the configuration file is processed sequentially down the document, so the package referenced by an “extends” should be defined above the package which extends it.

The optional `abstract` attribute creates a base package that can omit the action configuration.

Attribute | Required | Description
--- | --- | ---
name | yes | key to for other packages to reference
extends | no | inherits package behavior of the package it extends
namespace | no | see Namespace Configuration
abstract | no | declares package to be abstract (no action configurations required in package)

### Simple usage

Package Example (struts.xml)

    <struts>
      <package name="employee" extends="struts-default" namespace="/employee">
        <default-interceptor-ref name="crudStack"/>

        <action name="list" method="list"
          class="org.apache.struts2.showcase.action.EmployeeAction" >
            <result>/empmanager/listEmployees.jsp</result>
            <interceptor-ref name="basicStack"/>
        </action>
        <action name="edit-*" class="org.apache.struts2.showcase.action.EmployeeAction">
          <param name="empId">{1}</param>
          <result>/empmanager/editEmployee.jsp</result>
            <interceptor-ref name="crudStack">
              <param name="validation.excludeMethods">execute</param>
            </interceptor-ref>
          </action>
          <action name="save" method="save"
              class="org.apache.struts2.showcase.action.EmployeeAction" >
            <result name="input">/empmanager/editEmployee.jsp</result>
            <result type="redirect">edit-${currentEmployee.empId}.action</result>
          </action>
          <action name="delete" method="delete"
            class="org.apache.struts2.showcase.action.EmployeeAction" >
            <result name="error">/empmanager/editEmployee.jsp</result>
            <result type="redirect">edit-${currentEmployee.empId}.action</result>
          </action>
      </package>
    </struts>

### Inherit from more than one package

Multi package Example (struts.xml)

    <struts>
      <package name="employee" extends="struts-default, json-default" namespace="/employee">

        <action name="list" method="list" class="org.apache.struts2.showcase.action.EmployeeAction" >
            <result>/empmanager/listEmployees.jsp</result>
            <result type="json">
                <param name="root">employees</param>
            </result>
        </action>

      </package>
    </struts>