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<div class="subTitle">org.apache.shiro.authc</div>
<h2 title="Class AbstractAuthenticator" class="title">Class AbstractAuthenticator</h2>
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<li>org.apache.shiro.authc.AbstractAuthenticator</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../org/apache/shiro/authc/Authenticator.html" title="interface in org.apache.shiro.authc">Authenticator</a>, <a href="../../../../org/apache/shiro/authc/LogoutAware.html" title="interface in org.apache.shiro.authc">LogoutAware</a></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/apache/shiro/authc/pam/ModularRealmAuthenticator.html" title="class in org.apache.shiro.authc.pam">ModularRealmAuthenticator</a></dd>
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<pre>public abstract class <a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.43">AbstractAuthenticator</a>
extends <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="../../../../org/apache/shiro/authc/Authenticator.html" title="interface in org.apache.shiro.authc">Authenticator</a>, <a href="../../../../org/apache/shiro/authc/LogoutAware.html" title="interface in org.apache.shiro.authc">LogoutAware</a></pre>
<div class="block">Superclass for almost all <a href="../../../../org/apache/shiro/authc/Authenticator.html" title="interface in org.apache.shiro.authc"><code>Authenticator</code></a> implementations that performs the common work around authentication
attempts.
<p/>
This class delegates the actual authentication attempt to subclasses but supports notification for
successful and failed logins as well as logouts. Notification is sent to one or more registered
<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s to allow for custom processing logic
when these conditions occur.
<p/>
In most cases, the only thing a subclass needs to do (via its <a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#doAuthenticate-org.apache.shiro.authc.AuthenticationToken-"><code>doAuthenticate(org.apache.shiro.authc.AuthenticationToken)</code></a> implementation)
is perform the actual principal/credential verification process for the submitted <code>AuthenticationToken</code>.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.1</dd>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#AbstractAuthenticator--">AbstractAuthenticator</a></span>()</code>
<div class="block">Default no-argument constructor.</div>
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<td class="colFirst"><code><a href="../../../../org/apache/shiro/authc/AuthenticationInfo.html" title="interface in org.apache.shiro.authc">AuthenticationInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#authenticate-org.apache.shiro.authc.AuthenticationToken-">authenticate</a></span>(<a href="../../../../org/apache/shiro/authc/AuthenticationToken.html" title="interface in org.apache.shiro.authc">AuthenticationToken</a>&nbsp;token)</code>
<div class="block">Implementation of the <a href="../../../../org/apache/shiro/authc/Authenticator.html" title="interface in org.apache.shiro.authc"><code>Authenticator</code></a> interface that functions in the following manner:
Calls template <a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#doAuthenticate-org.apache.shiro.authc.AuthenticationToken-"><code>doAuthenticate</code></a> method for subclass execution of the actual
authentication behavior.</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected abstract <a href="../../../../org/apache/shiro/authc/AuthenticationInfo.html" title="interface in org.apache.shiro.authc">AuthenticationInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#doAuthenticate-org.apache.shiro.authc.AuthenticationToken-">doAuthenticate</a></span>(<a href="../../../../org/apache/shiro/authc/AuthenticationToken.html" title="interface in org.apache.shiro.authc">AuthenticationToken</a>&nbsp;token)</code>
<div class="block">Template design pattern hook for subclasses to implement specific authentication behavior.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc">AuthenticationListener</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#getAuthenticationListeners--">getAuthenticationListeners</a></span>()</code>
<div class="block">Returns the <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that should be notified during authentication
attempts.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#notifyFailure-org.apache.shiro.authc.AuthenticationToken-org.apache.shiro.authc.AuthenticationException-">notifyFailure</a></span>(<a href="../../../../org/apache/shiro/authc/AuthenticationToken.html" title="interface in org.apache.shiro.authc">AuthenticationToken</a>&nbsp;token,
<a href="../../../../org/apache/shiro/authc/AuthenticationException.html" title="class in org.apache.shiro.authc">AuthenticationException</a>&nbsp;ae)</code>
<div class="block">Notifies any registered <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that
authentication failed for the
specified <code>token</code> which resulted in the specified <code>ae</code> exception.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#notifyLogout-org.apache.shiro.subject.PrincipalCollection-">notifyLogout</a></span>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</code>
<div class="block">Notifies any registered <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that a
<code>Subject</code> has logged-out.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#notifySuccess-org.apache.shiro.authc.AuthenticationToken-org.apache.shiro.authc.AuthenticationInfo-">notifySuccess</a></span>(<a href="../../../../org/apache/shiro/authc/AuthenticationToken.html" title="interface in org.apache.shiro.authc">AuthenticationToken</a>&nbsp;token,
<a href="../../../../org/apache/shiro/authc/AuthenticationInfo.html" title="interface in org.apache.shiro.authc">AuthenticationInfo</a>&nbsp;info)</code>
<div class="block">Notifies any registered <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that
authentication was successful for the specified <code>token</code> which resulted in the specified
<code>info</code>.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#onLogout-org.apache.shiro.subject.PrincipalCollection-">onLogout</a></span>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</code>
<div class="block">This implementation merely calls
<a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#notifyLogout-org.apache.shiro.subject.PrincipalCollection-"><code>notifyLogout</code></a> to allow any registered listeners
to react to the logout.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#setAuthenticationListeners-java.util.Collection-">setAuthenticationListeners</a></span>(<a href="https://docs.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc">AuthenticationListener</a>&gt;&nbsp;listeners)</code>
<div class="block">Sets the <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that should be notified during authentication
attempts.</div>
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<h4>AbstractAuthenticator</h4>
<pre>public&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.69">AbstractAuthenticator</a>()</pre>
<div class="block">Default no-argument constructor. Ensures the internal
<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a> collection is a non-null <code>ArrayList</code>.</div>
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<h4>setAuthenticationListeners</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.85">setAuthenticationListeners</a>(<a href="https://docs.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc">AuthenticationListener</a>&gt;&nbsp;listeners)</pre>
<div class="block">Sets the <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that should be notified during authentication
attempts.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>listeners</code> - one or more <code>AuthenticationListener</code>s that should be notified due to an
authentication attempt.</dd>
</dl>
</li>
</ul>
<a name="getAuthenticationListeners--">
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<h4>getAuthenticationListeners</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc">AuthenticationListener</a>&gt;&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.101">getAuthenticationListeners</a>()</pre>
<div class="block">Returns the <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that should be notified during authentication
attempts.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that should be notified during authentication
attempts.</dd>
</dl>
</li>
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<a name="notifySuccess-org.apache.shiro.authc.AuthenticationToken-org.apache.shiro.authc.AuthenticationInfo-">
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<h4>notifySuccess</h4>
<pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.119">notifySuccess</a>(<a href="../../../../org/apache/shiro/authc/AuthenticationToken.html" title="interface in org.apache.shiro.authc">AuthenticationToken</a>&nbsp;token,
<a href="../../../../org/apache/shiro/authc/AuthenticationInfo.html" title="interface in org.apache.shiro.authc">AuthenticationInfo</a>&nbsp;info)</pre>
<div class="block">Notifies any registered <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that
authentication was successful for the specified <code>token</code> which resulted in the specified
<code>info</code>. This implementation merely iterates over the internal <code>listeners</code> collection and
calls <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html#onSuccess-org.apache.shiro.authc.AuthenticationToken-org.apache.shiro.authc.AuthenticationInfo-"><code>onSuccess</code></a>
for each.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>token</code> - the submitted <code>AuthenticationToken</code> that resulted in a successful authentication.</dd>
<dd><code>info</code> - the returned <code>AuthenticationInfo</code> resulting from the successful authentication.</dd>
</dl>
</li>
</ul>
<a name="notifyFailure-org.apache.shiro.authc.AuthenticationToken-org.apache.shiro.authc.AuthenticationException-">
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<h4>notifyFailure</h4>
<pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.136">notifyFailure</a>(<a href="../../../../org/apache/shiro/authc/AuthenticationToken.html" title="interface in org.apache.shiro.authc">AuthenticationToken</a>&nbsp;token,
<a href="../../../../org/apache/shiro/authc/AuthenticationException.html" title="class in org.apache.shiro.authc">AuthenticationException</a>&nbsp;ae)</pre>
<div class="block">Notifies any registered <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that
authentication failed for the
specified <code>token</code> which resulted in the specified <code>ae</code> exception. This implementation merely
iterates over the internal <code>listeners</code> collection and calls
<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html#onFailure-org.apache.shiro.authc.AuthenticationToken-org.apache.shiro.authc.AuthenticationException-"><code>onFailure</code></a>
for each.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>token</code> - the submitted <code>AuthenticationToken</code> that resulted in a failed authentication.</dd>
<dd><code>ae</code> - the resulting <code>AuthenticationException</code> that caused the authentication to fail.</dd>
</dl>
</li>
</ul>
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<h4>notifyLogout</h4>
<pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.151">notifyLogout</a>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</pre>
<div class="block">Notifies any registered <a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s that a
<code>Subject</code> has logged-out. This implementation merely
iterates over the internal <code>listeners</code> collection and calls
<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html#onLogout-org.apache.shiro.subject.PrincipalCollection-"><code>onLogout</code></a>
for each.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>principals</code> - the identifying principals of the <code>Subject</code>/account logging out.</dd>
</dl>
</li>
</ul>
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<h4>onLogout</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.164">onLogout</a>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</pre>
<div class="block">This implementation merely calls
<a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#notifyLogout-org.apache.shiro.subject.PrincipalCollection-"><code>notifyLogout</code></a> to allow any registered listeners
to react to the logout.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/shiro/authc/LogoutAware.html#onLogout-org.apache.shiro.subject.PrincipalCollection-">onLogout</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/shiro/authc/LogoutAware.html" title="interface in org.apache.shiro.authc">LogoutAware</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>principals</code> - the identifying principals of the <code>Subject</code>/account logging out.</dd>
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<h4>authenticate</h4>
<pre>public final&nbsp;<a href="../../../../org/apache/shiro/authc/AuthenticationInfo.html" title="interface in org.apache.shiro.authc">AuthenticationInfo</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.188">authenticate</a>(<a href="../../../../org/apache/shiro/authc/AuthenticationToken.html" title="interface in org.apache.shiro.authc">AuthenticationToken</a>&nbsp;token)
throws <a href="../../../../org/apache/shiro/authc/AuthenticationException.html" title="class in org.apache.shiro.authc">AuthenticationException</a></pre>
<div class="block">Implementation of the <a href="../../../../org/apache/shiro/authc/Authenticator.html" title="interface in org.apache.shiro.authc"><code>Authenticator</code></a> interface that functions in the following manner:
<ol>
<li>Calls template <a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#doAuthenticate-org.apache.shiro.authc.AuthenticationToken-"><code>doAuthenticate</code></a> method for subclass execution of the actual
authentication behavior.</li>
<li>If an <code>AuthenticationException</code> is thrown during <code>doAuthenticate</code>,
<a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#notifyFailure-org.apache.shiro.authc.AuthenticationToken-org.apache.shiro.authc.AuthenticationException-"><code>notify</code></a> any registered
<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s of the exception and then propagate the exception
for the caller to handle.</li>
<li>If no exception is thrown (indicating a successful login),
<a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#notifySuccess-org.apache.shiro.authc.AuthenticationToken-org.apache.shiro.authc.AuthenticationInfo-"><code>notify</code></a> any registered
<a href="../../../../org/apache/shiro/authc/AuthenticationListener.html" title="interface in org.apache.shiro.authc"><code>AuthenticationListener</code></a>s of the successful attempt.</li>
<li>Return the <code>AuthenticationInfo</code></li>
</ol></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/shiro/authc/Authenticator.html#authenticate-org.apache.shiro.authc.AuthenticationToken-">authenticate</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/shiro/authc/Authenticator.html" title="interface in org.apache.shiro.authc">Authenticator</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>token</code> - the submitted token representing the subject's (user's) login principals and credentials.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the AuthenticationInfo referencing the authenticated user's account data.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/shiro/authc/AuthenticationException.html" title="class in org.apache.shiro.authc">AuthenticationException</a></code> - if there is any problem during the authentication process - see the
interface's JavaDoc for a more detailed explanation.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/shiro/authc/ExpiredCredentialsException.html" title="class in org.apache.shiro.authc"><code>ExpiredCredentialsException</code></a>,
<a href="../../../../org/apache/shiro/authc/IncorrectCredentialsException.html" title="class in org.apache.shiro.authc"><code>IncorrectCredentialsException</code></a>,
<a href="../../../../org/apache/shiro/authc/ExcessiveAttemptsException.html" title="class in org.apache.shiro.authc"><code>ExcessiveAttemptsException</code></a>,
<a href="../../../../org/apache/shiro/authc/LockedAccountException.html" title="class in org.apache.shiro.authc"><code>LockedAccountException</code></a>,
<a href="../../../../org/apache/shiro/authc/ConcurrentAccessException.html" title="class in org.apache.shiro.authc"><code>ConcurrentAccessException</code></a>,
<a href="../../../../org/apache/shiro/authc/UnknownAccountException.html" title="class in org.apache.shiro.authc"><code>UnknownAccountException</code></a></dd>
</dl>
</li>
</ul>
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<h4>doAuthenticate</h4>
<pre>protected abstract&nbsp;<a href="../../../../org/apache/shiro/authc/AuthenticationInfo.html" title="interface in org.apache.shiro.authc">AuthenticationInfo</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/authc/AbstractAuthenticator.html#line.257">doAuthenticate</a>(<a href="../../../../org/apache/shiro/authc/AuthenticationToken.html" title="interface in org.apache.shiro.authc">AuthenticationToken</a>&nbsp;token)
throws <a href="../../../../org/apache/shiro/authc/AuthenticationException.html" title="class in org.apache.shiro.authc">AuthenticationException</a></pre>
<div class="block">Template design pattern hook for subclasses to implement specific authentication behavior.
<p/>
Common behavior for most authentication attempts is encapsulated in the
<a href="../../../../org/apache/shiro/authc/AbstractAuthenticator.html#authenticate-org.apache.shiro.authc.AuthenticationToken-"><code>authenticate(org.apache.shiro.authc.AuthenticationToken)</code></a> method and that method invokes this one for custom behavior.
<p/>
<b>N.B.</b> Subclasses <em>should</em> throw some kind of
<code>AuthenticationException</code> if there is a problem during
authentication instead of returning <code>null</code>. A <code>null</code> return value indicates
a configuration or programming error, since <code>AuthenticationException</code>s should
indicate any expected problem (such as an unknown account or username, or invalid password, etc).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>token</code> - the authentication token encapsulating the user's login information.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an <code>AuthenticationInfo</code> object encapsulating the user's account information
important to Shiro.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/shiro/authc/AuthenticationException.html" title="class in org.apache.shiro.authc">AuthenticationException</a></code> - if there is a problem logging in the user.</dd>
</dl>
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