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     <a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/annotation-workflow-interceptor.md" title="Edit this page on GitHub">Edit on GitHub</a>

     <a href="interceptors.html" title="back to Interceptors"><< back to Interceptors</a>

     <h1 id="annotation-workflow-interceptor">Annotation Workflow Interceptor</h1>

 <p>Invokes any annotated methods on the action. Specifically, it supports the following annotations</p>

 <ul>
   <li><code class="language-plaintext highlighter-rouge">@Before</code> - will be invoked before the action method. If the returned value is not null, it is returned as the action
 result code</li>
   <li><code class="language-plaintext highlighter-rouge">@BeforeResult</code> - will be invoked after the action method but before the result execution</li>
   <li><code class="language-plaintext highlighter-rouge">@After</code> - will be invoked after the action method and result execution</li>
 </ul>

 <p>There can be multiple methods marked with the same annotations, but the order of their execution is not guaranteed.
 However, the annotated methods on the superclass chain are guaranteed to be invoked before the annotated method in the current
 class in the case of a <code class="language-plaintext highlighter-rouge">@Before</code> annotations and after, if the annotations is <code class="language-plaintext highlighter-rouge">@After</code>.</p>

 <h2 id="examples">Examples</h2>

 <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code>  <span class="kd">public</span> <span class="kd">class</span> <span class="nc">BaseAnnotatedAction</span> <span class="o">{</span>
   	<span class="kd">protected</span> <span class="nc">String</span> <span class="n">log</span> <span class="o">=</span> <span class="s">""</span><span class="o">;</span>

   	<span class="nd">@Before</span>
   	<span class="kd">public</span> <span class="nc">String</span> <span class="nf">baseBefore</span><span class="o">()</span> <span class="o">{</span>
   		<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span> <span class="s">"baseBefore-"</span><span class="o">;</span>
   		<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
   	<span class="o">}</span>
   <span class="o">}</span>

   <span class="kd">public</span> <span class="kd">class</span> <span class="nc">AnnotatedAction</span> <span class="kd">extends</span> <span class="nc">BaseAnnotatedAction</span> <span class="o">{</span>
   	<span class="nd">@Before</span>
   	<span class="kd">public</span> <span class="nc">String</span> <span class="nf">before</span><span class="o">()</span> <span class="o">{</span>
   		<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span> <span class="s">"before"</span><span class="o">;</span>
   		<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
   	<span class="o">}</span>

   	<span class="kd">public</span> <span class="nc">String</span> <span class="nf">execute</span><span class="o">()</span> <span class="o">{</span>
   		<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span> <span class="s">"-execute"</span><span class="o">;</span>
   		<span class="k">return</span> <span class="nc">Action</span><span class="o">.</span><span class="na">SUCCESS</span><span class="o">;</span>
   	<span class="o">}</span>

   	<span class="nd">@BeforeResult</span>
   	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">beforeResult</span><span class="o">()</span> <span class="kd">throws</span> <span class="nc">Exception</span> <span class="o">{</span>
   		<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span><span class="s">"-beforeResult"</span><span class="o">;</span>
   	<span class="o">}</span>

   	<span class="nd">@After</span>
   	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">after</span><span class="o">()</span> <span class="o">{</span>
   		<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span> <span class="s">"-after"</span><span class="o">;</span>
   	<span class="o">}</span>
   <span class="o">}</span>
 </code></pre></div></div>

 <p>Configure a stack in struts.xml that replaces the PrepareInterceptor with the AnnotationWorkflowInterceptor:</p>

 <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;interceptor-stack</span> <span class="na">name=</span><span class="s">"annotatedStack"</span><span class="nt">&gt;</span>
 	<span class="nt">&lt;interceptor-ref</span> <span class="na">name=</span><span class="s">"static-params"</span><span class="nt">/&gt;</span>
 	<span class="nt">&lt;interceptor-ref</span> <span class="na">name=</span><span class="s">"params"</span><span class="nt">/&gt;</span>
 	<span class="nt">&lt;interceptor-ref</span> <span class="na">name=</span><span class="s">"conversionError"</span><span class="nt">/&gt;</span>
 	<span class="nt">&lt;interceptor-ref</span> <span class="na">name=</span><span class="s">"annotationWorkflow"</span><span class="nt">/&gt;</span>
 <span class="nt">&lt;/interceptor-stack&gt;</span>
 </code></pre></div></div>

 <p>Given an Action, AnnotatedAction, add a reference to the AnnotationWorkflowInterceptor interceptor.</p>

 <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;action</span> <span class="na">name=</span><span class="s">"AnnotatedAction"</span> <span class="na">class=</span><span class="s">"com.examples.AnnotatedAction"</span><span class="nt">&gt;</span>
    <span class="nt">&lt;interceptor-ref</span> <span class="na">name=</span><span class="s">"annotationWorkflow"</span><span class="nt">/&gt;</span>
    <span class="nt">&lt;result</span> <span class="na">name=</span><span class="s">"success"</span> <span class="na">type=</span><span class="s">"freemarker"</span><span class="nt">&gt;</span>good_result.ftl<span class="nt">&lt;/result&gt;</span>
 <span class="nt">&lt;/action&gt;</span>
 </code></pre></div></div>

 <p>With the interceptor applied and the action executed on <code class="language-plaintext highlighter-rouge">AnnotatedAction</code> the log instance variable will contain
 <code class="language-plaintext highlighter-rouge">baseBefore-before-execute-beforeResult-after</code>.</p>

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	<a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/annotation-workflow-interceptor.md" title="Edit this page on GitHub">Edit on GitHub</a>

	<a href="interceptors.html" title="back to Interceptors"><< back to Interceptors</a>

	<h1 id="annotation-workflow-interceptor">Annotation Workflow Interceptor</h1>

	<p>Invokes any annotated methods on the action. Specifically, it supports the following annotations</p>

	<ul>
	<li><code class="language-plaintext highlighter-rouge">@Before</code> - will be invoked before the action method. If the returned value is not null, it is returned as the action
	result code</li>
	<li><code class="language-plaintext highlighter-rouge">@BeforeResult</code> - will be invoked after the action method but before the result execution</li>
	<li><code class="language-plaintext highlighter-rouge">@After</code> - will be invoked after the action method and result execution</li>
	</ul>

	<p>There can be multiple methods marked with the same annotations, but the order of their execution is not guaranteed.
	However, the annotated methods on the superclass chain are guaranteed to be invoked before the annotated method in the current
	class in the case of a <code class="language-plaintext highlighter-rouge">@Before</code> annotations and after, if the annotations is <code class="language-plaintext highlighter-rouge">@After</code>.</p>

	<h2 id="examples">Examples</h2>

	<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">public</span> <span class="kd">class</span> <span class="nc">BaseAnnotatedAction</span> <span class="o">{</span>
	<span class="kd">protected</span> <span class="nc">String</span> <span class="n">log</span> <span class="o">=</span> <span class="s">""</span><span class="o">;</span>

	<span class="nd">@Before</span>
	<span class="kd">public</span> <span class="nc">String</span> <span class="nf">baseBefore</span><span class="o">()</span> <span class="o">{</span>
	<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span> <span class="s">"baseBefore-"</span><span class="o">;</span>
	<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
	<span class="o">}</span>
	<span class="o">}</span>

	<span class="kd">public</span> <span class="kd">class</span> <span class="nc">AnnotatedAction</span> <span class="kd">extends</span> <span class="nc">BaseAnnotatedAction</span> <span class="o">{</span>
	<span class="nd">@Before</span>
	<span class="kd">public</span> <span class="nc">String</span> <span class="nf">before</span><span class="o">()</span> <span class="o">{</span>
	<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span> <span class="s">"before"</span><span class="o">;</span>
	<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
	<span class="o">}</span>

	<span class="kd">public</span> <span class="nc">String</span> <span class="nf">execute</span><span class="o">()</span> <span class="o">{</span>
	<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span> <span class="s">"-execute"</span><span class="o">;</span>
	<span class="k">return</span> <span class="nc">Action</span><span class="o">.</span><span class="na">SUCCESS</span><span class="o">;</span>
	<span class="o">}</span>

	<span class="nd">@BeforeResult</span>
	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">beforeResult</span><span class="o">()</span> <span class="kd">throws</span> <span class="nc">Exception</span> <span class="o">{</span>
	<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span><span class="s">"-beforeResult"</span><span class="o">;</span>
	<span class="o">}</span>

	<span class="nd">@After</span>
	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">after</span><span class="o">()</span> <span class="o">{</span>
	<span class="n">log</span> <span class="o">=</span> <span class="n">log</span> <span class="o">+</span> <span class="s">"-after"</span><span class="o">;</span>
	<span class="o">}</span>
	<span class="o">}</span>
	</code></pre></div></div>

	<p>Configure a stack in struts.xml that replaces the PrepareInterceptor with the AnnotationWorkflowInterceptor:</p>

	<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><interceptor-stack</span> <span class="na">name=</span><span class="s">"annotatedStack"</span><span class="nt">></span>
	<span class="nt"><interceptor-ref</span> <span class="na">name=</span><span class="s">"static-params"</span><span class="nt">/></span>
	<span class="nt"><interceptor-ref</span> <span class="na">name=</span><span class="s">"params"</span><span class="nt">/></span>
	<span class="nt"><interceptor-ref</span> <span class="na">name=</span><span class="s">"conversionError"</span><span class="nt">/></span>
	<span class="nt"><interceptor-ref</span> <span class="na">name=</span><span class="s">"annotationWorkflow"</span><span class="nt">/></span>
	<span class="nt"></interceptor-stack></span>
	</code></pre></div></div>

	<p>Given an Action, AnnotatedAction, add a reference to the AnnotationWorkflowInterceptor interceptor.</p>

	<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><action</span> <span class="na">name=</span><span class="s">"AnnotatedAction"</span> <span class="na">class=</span><span class="s">"com.examples.AnnotatedAction"</span><span class="nt">></span>
	<span class="nt"><interceptor-ref</span> <span class="na">name=</span><span class="s">"annotationWorkflow"</span><span class="nt">/></span>
	<span class="nt"><result</span> <span class="na">name=</span><span class="s">"success"</span> <span class="na">type=</span><span class="s">"freemarker"</span><span class="nt">></span>good_result.ftl<span class="nt"></result></span>
	<span class="nt"></action></span>
	</code></pre></div></div>

	<p>With the interceptor applied and the action executed on <code class="language-plaintext highlighter-rouge">AnnotatedAction</code> the log instance variable will contain
	<code class="language-plaintext highlighter-rouge">baseBefore-before-execute-beforeResult-after</code>.</p>

	</section>
	</article>


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