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 <div class="subTitle">javax.servlet.jsp</div>
 <h2 title="Interface JspApplicationContext" class="title">Interface JspApplicationContext</h2>
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 <pre>public interface <span class="typeNameLabel">JspApplicationContext</span></pre>
 <div class="block">Stores application-scoped information relevant to JSP containers.

  <p>
  The JSP container must create a single instance of <code>JspApplicationContext</code> for each
  <code>ServletContext</code> instance.
  </p>

  <p>
  An instance of <code>JspApplicationContext</code> is obtained by invoking the static
  <a href="../../../javax/servlet/jsp/JspFactory.html#getJspApplicationContext-javax.servlet.ServletContext-"><code>JspFactory.getJspApplicationContext(javax.servlet.ServletContext)</code></a> method, passing the <code>ServletContext</code> of the corresponding web
  application.
  </p>

  <p>
  The <code>JspApplicationContext</code> provides the following services to JSP applications:
  </p>
  <ul>
  <li>Allows registration of <code>ELResolver</code>s, which are used to resolve variables in EL expressions contained
  in JSP pages and tag files.</li>
  <li>Provides an instance of <code>ExpressionFactory</code> for those applications or frameworks that need to perform
  programmatic evaluation of EL expressions instead of allowing the JSP container to do it for them.</li>
  <li>Allows the attachment of <code>ELContextListener</code> instances for notification whenever a new
  <code>ELContext</code> is created. This is necessary when an application wishes to make custom context objects
  available to their pluggable <code>ELResolver</code>s.</li>
  </ul></div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>JSP 2.1</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../javax/servlet/ServletContext.html" title="interface in javax.servlet"><code>ServletContext</code></a>,
 <a href="../../../javax/servlet/jsp/JspFactory.html" title="class in javax.servlet.jsp"><code>JspFactory</code></a>,
 <code>javax.el.ELResolver</code>,
 <code>javax.el.ExpressionFactory</code>,
 <code>javax.el.ELContextListener</code></dd>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspApplicationContext.html#addELContextListener-ELContextListener-">addELContextListener</a></span>(ELContextListener&nbsp;listener)</code>
 <div class="block">Registers a <code>ELContextListener</code>s so that context objects can be added whenever a new
  <code>ELContext</code> is created.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspApplicationContext.html#addELResolver-ELResolver-">addELResolver</a></span>(ELResolver&nbsp;resolver)</code>
 <div class="block">Adds an <code>ELResolver</code> to affect the way EL variables and properties are resolved for EL expressions
  appearing in JSP pages and tag files.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>ExpressionFactory</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspApplicationContext.html#getExpressionFactory--">getExpressionFactory</a></span>()</code>
 <div class="block">Returns a factory used to create <code>ValueExpression</code>s and <code>MethodExpression</code>s so that EL
  expressions can be parsed and evaluated.</div>
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 <pre>void&nbsp;addELResolver(ELResolver&nbsp;resolver)</pre>
 <div class="block">Adds an <code>ELResolver</code> to affect the way EL variables and properties are resolved for EL expressions
  appearing in JSP pages and tag files.

  <p>
  For example, in the EL expression ${employee.lastName}, an <code>ELResolver</code> determines what object
  "employee" references and how to find its "lastName" property.
  </p>

  <p>
  When evaluating an expression, the JSP container will consult a set of standard resolvers as well as any
  resolvers registered via this method. The set of resolvers are consulted in the following order:
  </p>
  <ul>
  <li><a href="../../../javax/servlet/jsp/el/ImplicitObjectELResolver.html" title="class in javax.servlet.jsp.el"><code>ImplicitObjectELResolver</code></a></li>
  <li><code>ELResolver</code>s registered via this method, in the order in which they are registered.</li>
  <li><code>javax.el.MapELResolver</code></li>
  <li><code>javax.el.ListELResolver</code></li>
  <li><code>javax.el.ArrayELResolver</code></li>
  <li><code>javax.el.BeanELResolver</code></li>
  <li><a href="../../../javax/servlet/jsp/el/ScopedAttributeELResolver.html" title="class in javax.servlet.jsp.el"><code>ScopedAttributeELResolver</code></a></li>
  </ul>

  <p>
  It is illegal to register an <code>ELResolver</code> after the application has received any request from the
  client. If an attempt is made to register an <code>ELResolver</code> after that time, an
  <code>IllegalStateException</code> is thrown.
  </p>
  <p>
  This restriction is in place to allow the JSP container to optimize for the common case where no additional
  <code>ELResolver</code>s are in the chain, aside from the standard ones. It is permissible to add
  <code>ELResolver</code>s before or after initialization to a <code>CompositeELResolver</code> that is already in
  the chain.
  </p>

  <p>
  It is not possible to remove an <code>ELResolver</code> registered with this method, once it has been registered.
  </p></div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>resolver</code> - The new <code>ELResolver</code></dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.IllegalStateException</code> - if an attempt is made to call this method after all
                                <code>ServletContextListener</code>s have had their <code>contextInitialized</code>
                                methods invoked.</dd>
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 <pre>ExpressionFactory&nbsp;getExpressionFactory()</pre>
 <div class="block">Returns a factory used to create <code>ValueExpression</code>s and <code>MethodExpression</code>s so that EL
  expressions can be parsed and evaluated.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>A concrete implementation of the an <code>ExpressionFactory</code>.</dd>
 </dl>
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 <pre>void&nbsp;addELContextListener(ELContextListener&nbsp;listener)</pre>
 <div class="block">Registers a <code>ELContextListener</code>s so that context objects can be added whenever a new
  <code>ELContext</code> is created.

  <p>
  At a minimum, the <code>ELContext</code> objects created will contain a reference to the <code>JspContext</code>
  for this request, which is added by the JSP container. This is sufficient for all the default
  <code>ELResolver</code>s listed in <a href="../../../javax/servlet/jsp/JspApplicationContext.html#addELResolver-ELResolver-"><code>addELResolver(ELResolver)</code></a>. Note that <code>JspContext.class</code> is used as the
  key to ELContext.putContext() for the <code>JspContext</code> object reference.
  </p>

  <p>
  This method is generally used by frameworks and applications that register their own <code>ELResolver</code> that
  needs context other than <code>JspContext</code>. The listener will typically add the necessary context to the
  <code>ELContext</code> provided in the event object. Registering a listener that adds context allows the
  <code>ELResolver</code>s in the stack to access the context they need when they do a resolution.
  </p></div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>listener</code> - The listener to be notified when a new <code>ELContext</code> is created.</dd>
 </dl>
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	<h2 title="Interface JspApplicationContext" class="title">Interface JspApplicationContext</h2>
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	<pre>public interface <span class="typeNameLabel">JspApplicationContext</span></pre>
	<div class="block">Stores application-scoped information relevant to JSP containers.

	<p>
	The JSP container must create a single instance of <code>JspApplicationContext</code> for each
	<code>ServletContext</code> instance.
	</p>

	<p>
	An instance of <code>JspApplicationContext</code> is obtained by invoking the static
	<a href="../../../javax/servlet/jsp/JspFactory.html#getJspApplicationContext-javax.servlet.ServletContext-"><code>JspFactory.getJspApplicationContext(javax.servlet.ServletContext)</code></a> method, passing the <code>ServletContext</code> of the corresponding web
	application.
	</p>

	<p>
	The <code>JspApplicationContext</code> provides the following services to JSP applications:
	</p>
	<ul>
	<li>Allows registration of <code>ELResolver</code>s, which are used to resolve variables in EL expressions contained
	in JSP pages and tag files.</li>
	<li>Provides an instance of <code>ExpressionFactory</code> for those applications or frameworks that need to perform
	programmatic evaluation of EL expressions instead of allowing the JSP container to do it for them.</li>
	<li>Allows the attachment of <code>ELContextListener</code> instances for notification whenever a new
	<code>ELContext</code> is created. This is necessary when an application wishes to make custom context objects
	available to their pluggable <code>ELResolver</code>s.</li>
	</ul></div>
	<dl>
	<dt><span class="simpleTagLabel">Since:</span></dt>
	<dd>JSP 2.1</dd>
	<dt><span class="seeLabel">See Also:</span></dt>
	<dd><a href="../../../javax/servlet/ServletContext.html" title="interface in javax.servlet"><code>ServletContext</code></a>,
	<a href="../../../javax/servlet/jsp/JspFactory.html" title="class in javax.servlet.jsp"><code>JspFactory</code></a>,
	<code>javax.el.ELResolver</code>,
	<code>javax.el.ExpressionFactory</code>,
	<code>javax.el.ELContextListener</code></dd>
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	<td class="colFirst"><code>void</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspApplicationContext.html#addELContextListener-ELContextListener-">addELContextListener</a></span>(ELContextListener listener)</code>
	<div class="block">Registers a <code>ELContextListener</code>s so that context objects can be added whenever a new
	<code>ELContext</code> is created.</div>
	</td>
	</tr>
	<tr id="i1" class="rowColor">
	<td class="colFirst"><code>void</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspApplicationContext.html#addELResolver-ELResolver-">addELResolver</a></span>(ELResolver resolver)</code>
	<div class="block">Adds an <code>ELResolver</code> to affect the way EL variables and properties are resolved for EL expressions
	appearing in JSP pages and tag files.</div>
	</td>
	</tr>
	<tr id="i2" class="altColor">
	<td class="colFirst"><code>ExpressionFactory</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/servlet/jsp/JspApplicationContext.html#getExpressionFactory--">getExpressionFactory</a></span>()</code>
	<div class="block">Returns a factory used to create <code>ValueExpression</code>s and <code>MethodExpression</code>s so that EL
	expressions can be parsed and evaluated.</div>
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	<h4>addELResolver</h4>
	<pre>void addELResolver(ELResolver resolver)</pre>
	<div class="block">Adds an <code>ELResolver</code> to affect the way EL variables and properties are resolved for EL expressions
	appearing in JSP pages and tag files.

	<p>
	For example, in the EL expression ${employee.lastName}, an <code>ELResolver</code> determines what object
	"employee" references and how to find its "lastName" property.
	</p>

	<p>
	When evaluating an expression, the JSP container will consult a set of standard resolvers as well as any
	resolvers registered via this method. The set of resolvers are consulted in the following order:
	</p>
	<ul>
	<li><a href="../../../javax/servlet/jsp/el/ImplicitObjectELResolver.html" title="class in javax.servlet.jsp.el"><code>ImplicitObjectELResolver</code></a></li>
	<li><code>ELResolver</code>s registered via this method, in the order in which they are registered.</li>
	<li><code>javax.el.MapELResolver</code></li>
	<li><code>javax.el.ListELResolver</code></li>
	<li><code>javax.el.ArrayELResolver</code></li>
	<li><code>javax.el.BeanELResolver</code></li>
	<li><a href="../../../javax/servlet/jsp/el/ScopedAttributeELResolver.html" title="class in javax.servlet.jsp.el"><code>ScopedAttributeELResolver</code></a></li>
	</ul>

	<p>
	It is illegal to register an <code>ELResolver</code> after the application has received any request from the
	client. If an attempt is made to register an <code>ELResolver</code> after that time, an
	<code>IllegalStateException</code> is thrown.
	</p>
	<p>
	This restriction is in place to allow the JSP container to optimize for the common case where no additional
	<code>ELResolver</code>s are in the chain, aside from the standard ones. It is permissible to add
	<code>ELResolver</code>s before or after initialization to a <code>CompositeELResolver</code> that is already in
	the chain.
	</p>

	<p>
	It is not possible to remove an <code>ELResolver</code> registered with this method, once it has been registered.
	</p></div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>resolver</code> - The new <code>ELResolver</code></dd>
	<dt><span class="throwsLabel">Throws:</span></dt>
	<dd><code>java.lang.IllegalStateException</code> - if an attempt is made to call this method after all
	<code>ServletContextListener</code>s have had their <code>contextInitialized</code>
	methods invoked.</dd>
	</dl>
	</li>
	</ul>
	<a name="getExpressionFactory--">
	<!-- -->
	</a>
	<ul class="blockList">
	<li class="blockList">
	<h4>getExpressionFactory</h4>
	<pre>ExpressionFactory getExpressionFactory()</pre>
	<div class="block">Returns a factory used to create <code>ValueExpression</code>s and <code>MethodExpression</code>s so that EL
	expressions can be parsed and evaluated.</div>
	<dl>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>A concrete implementation of the an <code>ExpressionFactory</code>.</dd>
	</dl>
	</li>
	</ul>
	<a name="addELContextListener-ELContextListener-">
	<!-- -->
	</a>
	<ul class="blockListLast">
	<li class="blockList">
	<h4>addELContextListener</h4>
	<pre>void addELContextListener(ELContextListener listener)</pre>
	<div class="block">Registers a <code>ELContextListener</code>s so that context objects can be added whenever a new
	<code>ELContext</code> is created.

	<p>
	At a minimum, the <code>ELContext</code> objects created will contain a reference to the <code>JspContext</code>
	for this request, which is added by the JSP container. This is sufficient for all the default
	<code>ELResolver</code>s listed in <a href="../../../javax/servlet/jsp/JspApplicationContext.html#addELResolver-ELResolver-"><code>addELResolver(ELResolver)</code></a>. Note that <code>JspContext.class</code> is used as the
	key to ELContext.putContext() for the <code>JspContext</code> object reference.
	</p>

	<p>
	This method is generally used by frameworks and applications that register their own <code>ELResolver</code> that
	needs context other than <code>JspContext</code>. The listener will typically add the necessary context to the
	<code>ELContext</code> provided in the event object. Registering a listener that adds context allows the
	<code>ELResolver</code>s in the stack to access the context they need when they do a resolution.
	</p></div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>listener</code> - The listener to be notified when a new <code>ELContext</code> is created.</dd>
	</dl>
	</li>
	</ul>
	</li>
	</ul>
	</li>
	</ul>
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