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         <title>Using the Annotation Processors Support in the NetBeans IDE</title>
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         <h1>Annotation Processors Support in the NetBeans IDE, Part I: Using Project Lombok </h1>
         <img  src="../../../images_www/articles/73/netbeans-stamp-80-74-73.png" class="stamp" alt="Content on this page applies to NetBeans IDE 7.2, 7.3, 7.4 and 8.0" title="Content on this page applies to the NetBeans IDE 7.2, 7.3, 7.4 and 8.0" >
         <div class="margin-around">
             <div class="feedback-box margin-around float-left" style="margin-right:15px">
 	    <p><b>Contents</b></p>

         <ul class="toc">
             <li><a href="annotations.html">Introduction</a></li>
             <li><a href="annotations.html#map">Map of javac Options and IDE Commands</a> </li>
           <li><strong>Using Project Lombok for Custom Annotations</strong>
             <ul>
               <li><a href="#create">Creating a New Java Project</a></li>
               <li><a href="#enableann">Enabling Custom Annotations for the Project</a> </li>
               <li><a href="#writeapp">Writing an Application Using Lombok Custom Annotations</a></li>
             </ul>
           </li>
             <li><a href="annotations-custom.html">Using Own Custom Annotation Processors in the IDE</a></li>
             <li><a href="annotations-custom.html#seealso" title="Compiling and Running the Program">See Also </a></li>
         </ul>
         </div>
 	</div>

 	   <p>To demonstrate how custom annotations work inside the NetBeans IDE, we will use Project Lombok,
            which provides a convenient way of automatically generating several Java code elements, such as getters, setters, constructors and others.
            For more information about its features, visit the <a href="http://projectlombok.org/" target="_blank">Project Lombok's website</a>.
            However, keep in mind that Project Lombok includes some features that might not work in all development environments.</p>

            <p style="clear:both"><b>To complete this tutorial, you need the following software and resources.</b></p>
         <table>
           <tbody>
             <tr>
               <th class="tblheader" scope="col">Software or Resource</th>
               <th class="tblheader" scope="col">Version Required</th>
             </tr>
             <tr>
               <td class="tbltd1"><a href="https://netbeans.org/downloads/index.html" target="_blank">NetBeans IDE</a></td>
               <td class="tbltd1">7.2, 7.3, 7.4, 8.0</td>
             </tr>
             <tr>
               <td class="tbltd1"><a href="http://www.oracle.com/technetwork/java/javase/downloads/index.html">Java Development Kit (JDK)</a></td>
               <td class="tbltd1">version 7 or 8</td>
             </tr>
             <tr>
               <td class="tbltd1"><a href="http://code.google.com/p/projectlombok/downloads/list">lombok.jar</a></td>
               <td class="tbltd1">v1.12.4 or newer</td>
             </tr>
           </tbody>
         </table>

         <h2><a name="create"></a>Creating a New Java project </h2>
         <p>In this exercise you create a simple Java project and class that is named <tt>MyBooks.java</tt>
         which will demonstrate annotations in action.</p>
         <ol>
             <li>Choose <strong>File &gt; New Project</strong> from the main menu to open the New Project wizard.</li>
             <li>Select the Java Application project type in the Java category. Click Next.</li>
             <li>In the Name and Location page of the wizard, type <strong><tt>TestAnn</tt></strong> as the project name.</li>
             <li>Type <strong><tt>testann.TestBooks</tt></strong> in the Create Main Class field to replace the default class name. Click Finish.<br>
             <img src="../../../images_www/articles/72/java/annotations/newproj.png" alt="screenshot of New Project wizard" title="Creating a new Java project in the NetBeans IDE" class="margin-around b-all">
             <p>When you click Finish, the IDE creates the Java application project and opens the <tt>TestBooks.java</tt> class in the editor.
             You can see that the new project is now visible in the Projects window and that the <tt>TestBooks.java</tt> class
             is in the <tt>testann</tt> package under the Source Packages node.</p></li>
             <li>Right-click the <tt>testann</tt> package node in the Projects window and choose New &gt; Java class.</li>
             <li>Type <strong><tt>MyBooks</tt></strong> for the Class Name and confirm that the class will be created in the <tt>testann</tt> package.
             Click Finish.
             <p>When you click Finish the IDE opens the new class in the editor.</p></li>
             <li>In the source editor, add the following three fields to <tt>MyBooks.java</tt>.
            <pre class="examplecode">package testann;

 public class MyBooks {
     <strong>private int year; //fields
     private String title;
     private String author;</strong>

 }</pre></li>
             <li>Place your insert cursor in the class declaration and press Ctrl-Space to invoke the editor's code completion support.</li>
             <li>Select <tt>MyBooks (int year, String title, String author) - generate</tt> in the code completion list
                 to generate a constructor for <tt>MyBooks.java</tt>.<br>
                 <img src="../../../images_www/articles/72/java/annotations/generate-constructor.png" alt="screenshot of code completion in editor" title="Code completion to generate constructor" class="margin-around b-all">
             </li>
             <li>Save your changes.</li>
     </ol>


     <h2><a name="enableann"></a>Enabling Custom Annotations (lombok.jar) for the Project </h2>
     <p>In this exercise you will modify the project's properties window to add a library to the project's classpath and enable
     annotation processing in the editor.</p>
     <ol>
         <li>Download the <a href="http://code.google.com/p/projectlombok/downloads/list" target="_blank">lombok.jar</a> file and save it on your system. </li>
         <li>Right-click the <tt>TestAnn</tt> project's node and choose Properties. </li>
         <li>Select the Libraries category in the Project Properties dialog.</li>
         <li>Click Add JAR/Folder in the Compile tab and locate the <tt>lombok.jar</tt> file that you downloaded.<br>
         <img src="../../../images_www/articles/72/java/annotations/properties1.png" alt="screenshot of Libraries category in Properties window" title="Libraries category in Properties window" class="margin-around b-all">

         <p>The resources added on the Compile tab correspond to the <tt>-classpath</tt> option of
         the <a href="http://download.oracle.com/javase/6/docs/technotes/tools/windows/javac.html#options" target="_blank">Java compiler</a>.
         As <tt>lombok.jar</tt> is a single JAR file that contains both annotation definitions and annotation processors,
         you should add it to the project's classpath, which is the Compile tab. </p>
         </li>
         <li>Choose the Compiling category in the Project Properties window.</li>
         <li>Confirm that the Enable Annotation Processing checkbox is selected (it is enabled by default) and
         select the Enable Annotation Processing in Editor checkbox.<br>
         <img src="../../../images_www/articles/72/java/annotations/properties2.png" alt="screenshot of Compiling category in Properties window" title="Compiling category in Properties window" class="margin-around b-all">

         <p>The Enable Annotation Processing checkbox enables annotation processing while building and compiling your project.
         If the checkbox is not selected, the <tt>-proc:none</tt> option is passed to the Java compiler,
         and compilation takes places without any annotation processing.
         So, if you want to process annotations in your code, the Enable Annotation Processing checkbox must be selected.</p>
         <p>By selecting the Enable Annotation Processing in Editor checkbox,
         you make annotation processing results visible in the editor.
         Any additional artifacts that are generated by annotation processors (classes, methods,  fields, etc.)
         become visible in the IDE Editor and available in code completion, Navigator, GoTo Type, Find usages, and others.</p>
         </li>
         <li>Click OK in the Project Properties window and return to the <tt>MyBooks.java</tt> file. </li>
     </ol>

     <p>If you expand the Libraries node in the Projects window, you can see that <tt>lombok.jar</tt> is now listed as a project library.</p>
 <img src="../../../images_www/articles/72/java/annotations/projects-window.png" alt="screenshot of Projects window" title="Libraries node in Projects window" class="margin-around b-all">

     <h2><a name="writeapp"></a>Writing an Application Using Lombok Custom Annotations </h2>
     <ol>
         <li>In <tt>MyBooks.java</tt> file, type <tt>@Data</tt> before the <tt>MyBooks</tt> class declaration.
             <tt>@Data</tt> is an annotation that generates the boilerplate code for Java classes:
             getters for all fields, setters for all non-final fields, and appropriate <tt>toString</tt>, <tt>equals</tt>, and <tt>hashCode</tt>
             implementations that involve the fields of the class.
         <p class="tips">To learn more about what annotations are supported by Project Lombok, refer to
             the Lombok <a href="http://projectlombok.org/features/index.html">Features Overview</a>.</p></li>
         <li>Click the hint in the editor's left margin and add import for <tt>lombok.Data</tt>.<br>
             <img src="../../../images_www/articles/72/java/annotations/import-lombok.png" alt="screenshot of hint in editor" title="Hint in editor to import lombok" class="margin-around b-all">

             <p>The resulting code in the Editor should look like the example below.</p>
                 <pre class="examplecode">package testann;

 import lombok.Data;


 @Data
 public class MyBooks {

     private int year; //fields
     private String title;
     private String author;

     public MyBooks(int year, String title, String author) {
         this.year = year;
         this.title = title;
         this.author = author;
     }
 }</pre>
             <p>Note that necessary code artifacts, such as getters, setters, toString, etc,
                 have been generated and you can see them in the Navigator window.
             The <tt>@Data</tt> annotation generated all the boilerplate code that is needed for a typical class.</p>
             <img src="../../../images_www/articles/72/java/annotations/nav.png" alt="screenshot of Navigator window" title="Navigator window showing project members" class="margin-around b-all">
             <p>You can also invoke the code completion window (Ctrl-Space) and see that the generated artifacts are available for picking them.
             Now, let's see that the project compiles and the generated artifacts can be called from other parts of the program.</p>
             </li>
             <li>Open the <tt>TestBooks.java</tt> file with the <em>main</em> method and add the following code (in bold) to create a new object of the <tt>MyBooks</tt> class.
                 <pre class="examplecode">package testann;

 public class TestBooks {

     public static void main(String[] args) {
         <strong>MyBooks books = new MyBooks(2009, "My Beautiful Dream", "John Smith");</strong>
     }
 }</pre>
             </li>
             <li>Add the following code to print out the values of the <tt>books</tt> variable.
                 <p>To return the values, we call the getter methods that were auto-generated by <tt>lombok.jar</tt>.
                 While you are typing, note that the auto-generated artifacts are available from the code completion window.</p>
                 <pre class="examplecode">package testann;

 public class TestBooks {

     public static void main(String[] args) {
         MyBooks books = new MyBooks(2009, "My Beautiful Dream", "John Smith");
         <strong>System.out.println("Year: " + books.getYear() + ", Title: " + books.getTitle() +  ", Author: " + books.getAuthor());</strong>
     }
 }</pre>
             </li>
             <li>Save your changes.</li>
             <li>Right-click the project node in the Projects window and choose Run (F6).
                 <p>When you run the application you should see the following output that
                 shows that the application compiled successfully.</p>
                 <img src="../../../images_www/articles/72/java/annotations/output.png" alt="screenshot of Output window" title="Output window after running the application" class="margin-around b-all"></li>
         </ol>
         <p>You can see that the artifacts generated by the Lombok annotation processor are accessible from other parts of the program.</p>


         <h2><a name="nextsteps"></a>Next Step </h2>
           <ul>
               <li>Java SE Documentation - <a href="http://download.oracle.com/javase/6/docs/technotes/guides/language/annotations.html" target="_blank">Annotations</a></li>
               <li>Java SE Tutorial - <a href="http://download.oracle.com/javase/tutorial/java/javaOO/annotations.html" target="_blank">Annotations</a> </li>
             <!--<li><a href="annotations-custom.html">Part II: Using Own Custom Annotation Processor in the IDE</a></li>-->
           </ul>
           <div class="feedback-box"><a href="/about/contact_form.html?to=3&subject=Feedback:%20Using%20the%20Annotation%20Processors%20Support%20in%20NetBeans%20IDE">Send Feedback on This Tutorial</a><br style="clear:both;" />
         </div>
 </body>
 </html>
	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

	<!--
	Copyright (c) 2010, 2011, 2011 Oracle and/or its affiliates. All rights reserved.
	-->
	<html>
	<head>
	<title>Using the Annotation Processors Support in the NetBeans IDE</title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" >
	<link rel="stylesheet" type="text/css" href="../../../netbeans.css">
	<meta name="keywords" content="NETBEANS, TUTORIAL, GUIDE, USER, DOCUMENTATION">
	<meta name="description" content="A very simple and quick introduction to the NetBeans IDE workflow by walking you through the creation of a
	simple Hello World Java console application." >
	</head>

	<body>

	<h1>Annotation Processors Support in the NetBeans IDE, Part I: Using Project Lombok </h1>
	<img src="../../../images_www/articles/73/netbeans-stamp-80-74-73.png" class="stamp" alt="Content on this page applies to NetBeans IDE 7.2, 7.3, 7.4 and 8.0" title="Content on this page applies to the NetBeans IDE 7.2, 7.3, 7.4 and 8.0" >
	<div class="margin-around">
	<div class="feedback-box margin-around float-left" style="margin-right:15px">
	<p><b>Contents</b></p>

	<ul class="toc">
	<li><a href="annotations.html">Introduction</a></li>
	<li><a href="annotations.html#map">Map of javac Options and IDE Commands</a> </li>
	<li><strong>Using Project Lombok for Custom Annotations</strong>
	<ul>
	<li><a href="#create">Creating a New Java Project</a></li>
	<li><a href="#enableann">Enabling Custom Annotations for the Project</a> </li>
	<li><a href="#writeapp">Writing an Application Using Lombok Custom Annotations</a></li>
	</ul>
	</li>
	<li><a href="annotations-custom.html">Using Own Custom Annotation Processors in the IDE</a></li>
	<li><a href="annotations-custom.html#seealso" title="Compiling and Running the Program">See Also </a></li>
	</ul>
	</div>
	</div>

	<p>To demonstrate how custom annotations work inside the NetBeans IDE, we will use Project Lombok,
	which provides a convenient way of automatically generating several Java code elements, such as getters, setters, constructors and others.
	For more information about its features, visit the <a href="http://projectlombok.org/" target="_blank">Project Lombok's website</a>.
	However, keep in mind that Project Lombok includes some features that might not work in all development environments.</p>

	<p style="clear:both"><b>To complete this tutorial, you need the following software and resources.</b></p>
	<table>
	<tbody>
	<tr>
	<th class="tblheader" scope="col">Software or Resource</th>
	<th class="tblheader" scope="col">Version Required</th>
	</tr>
	<tr>
	<td class="tbltd1"><a href="https://netbeans.org/downloads/index.html" target="_blank">NetBeans IDE</a></td>
	<td class="tbltd1">7.2, 7.3, 7.4, 8.0</td>
	</tr>
	<tr>
	<td class="tbltd1"><a href="http://www.oracle.com/technetwork/java/javase/downloads/index.html">Java Development Kit (JDK)</a></td>
	<td class="tbltd1">version 7 or 8</td>
	</tr>
	<tr>
	<td class="tbltd1"><a href="http://code.google.com/p/projectlombok/downloads/list">lombok.jar</a></td>
	<td class="tbltd1">v1.12.4 or newer</td>
	</tr>
	</tbody>
	</table>

	<h2><a name="create"></a>Creating a New Java project </h2>
	<p>In this exercise you create a simple Java project and class that is named <tt>MyBooks.java</tt>
	which will demonstrate annotations in action.</p>
	<ol>
	<li>Choose <strong>File > New Project</strong> from the main menu to open the New Project wizard.</li>
	<li>Select the Java Application project type in the Java category. Click Next.</li>
	<li>In the Name and Location page of the wizard, type <strong><tt>TestAnn</tt></strong> as the project name.</li>
	<li>Type <strong><tt>testann.TestBooks</tt></strong> in the Create Main Class field to replace the default class name. Click Finish.<br>
	<img src="../../../images_www/articles/72/java/annotations/newproj.png" alt="screenshot of New Project wizard" title="Creating a new Java project in the NetBeans IDE" class="margin-around b-all">
	<p>When you click Finish, the IDE creates the Java application project and opens the <tt>TestBooks.java</tt> class in the editor.
	You can see that the new project is now visible in the Projects window and that the <tt>TestBooks.java</tt> class
	is in the <tt>testann</tt> package under the Source Packages node.</p></li>
	<li>Right-click the <tt>testann</tt> package node in the Projects window and choose New > Java class.</li>
	<li>Type <strong><tt>MyBooks</tt></strong> for the Class Name and confirm that the class will be created in the <tt>testann</tt> package.
	Click Finish.
	<p>When you click Finish the IDE opens the new class in the editor.</p></li>
	<li>In the source editor, add the following three fields to <tt>MyBooks.java</tt>.
	<pre class="examplecode">package testann;

	public class MyBooks {
	<strong>private int year; //fields
	private String title;
	private String author;</strong>

	}</pre></li>
	<li>Place your insert cursor in the class declaration and press Ctrl-Space to invoke the editor's code completion support.</li>
	<li>Select <tt>MyBooks (int year, String title, String author) - generate</tt> in the code completion list
	to generate a constructor for <tt>MyBooks.java</tt>.<br>
	<img src="../../../images_www/articles/72/java/annotations/generate-constructor.png" alt="screenshot of code completion in editor" title="Code completion to generate constructor" class="margin-around b-all">
	</li>
	<li>Save your changes.</li>
	</ol>


	<h2><a name="enableann"></a>Enabling Custom Annotations (lombok.jar) for the Project </h2>
	<p>In this exercise you will modify the project's properties window to add a library to the project's classpath and enable
	annotation processing in the editor.</p>
	<ol>
	<li>Download the <a href="http://code.google.com/p/projectlombok/downloads/list" target="_blank">lombok.jar</a> file and save it on your system. </li>
	<li>Right-click the <tt>TestAnn</tt> project's node and choose Properties. </li>
	<li>Select the Libraries category in the Project Properties dialog.</li>
	<li>Click Add JAR/Folder in the Compile tab and locate the <tt>lombok.jar</tt> file that you downloaded.<br>
	<img src="../../../images_www/articles/72/java/annotations/properties1.png" alt="screenshot of Libraries category in Properties window" title="Libraries category in Properties window" class="margin-around b-all">

	<p>The resources added on the Compile tab correspond to the <tt>-classpath</tt> option of
	the <a href="http://download.oracle.com/javase/6/docs/technotes/tools/windows/javac.html#options" target="_blank">Java compiler</a>.
	As <tt>lombok.jar</tt> is a single JAR file that contains both annotation definitions and annotation processors,
	you should add it to the project's classpath, which is the Compile tab. </p>
	</li>
	<li>Choose the Compiling category in the Project Properties window.</li>
	<li>Confirm that the Enable Annotation Processing checkbox is selected (it is enabled by default) and
	select the Enable Annotation Processing in Editor checkbox.<br>
	<img src="../../../images_www/articles/72/java/annotations/properties2.png" alt="screenshot of Compiling category in Properties window" title="Compiling category in Properties window" class="margin-around b-all">

	<p>The Enable Annotation Processing checkbox enables annotation processing while building and compiling your project.
	If the checkbox is not selected, the <tt>-proc:none</tt> option is passed to the Java compiler,
	and compilation takes places without any annotation processing.
	So, if you want to process annotations in your code, the Enable Annotation Processing checkbox must be selected.</p>
	<p>By selecting the Enable Annotation Processing in Editor checkbox,
	you make annotation processing results visible in the editor.
	Any additional artifacts that are generated by annotation processors (classes, methods, fields, etc.)
	become visible in the IDE Editor and available in code completion, Navigator, GoTo Type, Find usages, and others.</p>
	</li>
	<li>Click OK in the Project Properties window and return to the <tt>MyBooks.java</tt> file. </li>
	</ol>

	<p>If you expand the Libraries node in the Projects window, you can see that <tt>lombok.jar</tt> is now listed as a project library.</p>
	<img src="../../../images_www/articles/72/java/annotations/projects-window.png" alt="screenshot of Projects window" title="Libraries node in Projects window" class="margin-around b-all">

	<h2><a name="writeapp"></a>Writing an Application Using Lombok Custom Annotations </h2>
	<ol>
	<li>In <tt>MyBooks.java</tt> file, type <tt>@Data</tt> before the <tt>MyBooks</tt> class declaration.
	<tt>@Data</tt> is an annotation that generates the boilerplate code for Java classes:
	getters for all fields, setters for all non-final fields, and appropriate <tt>toString</tt>, <tt>equals</tt>, and <tt>hashCode</tt>
	implementations that involve the fields of the class.
	<p class="tips">To learn more about what annotations are supported by Project Lombok, refer to
	the Lombok <a href="http://projectlombok.org/features/index.html">Features Overview</a>.</p></li>
	<li>Click the hint in the editor's left margin and add import for <tt>lombok.Data</tt>.<br>
	<img src="../../../images_www/articles/72/java/annotations/import-lombok.png" alt="screenshot of hint in editor" title="Hint in editor to import lombok" class="margin-around b-all">

	<p>The resulting code in the Editor should look like the example below.</p>
	<pre class="examplecode">package testann;

	import lombok.Data;


	@Data
	public class MyBooks {

	private int year; //fields
	private String title;
	private String author;

	public MyBooks(int year, String title, String author) {
	this.year = year;
	this.title = title;
	this.author = author;
	}
	}</pre>
	<p>Note that necessary code artifacts, such as getters, setters, toString, etc,
	have been generated and you can see them in the Navigator window.
	The <tt>@Data</tt> annotation generated all the boilerplate code that is needed for a typical class.</p>
	<img src="../../../images_www/articles/72/java/annotations/nav.png" alt="screenshot of Navigator window" title="Navigator window showing project members" class="margin-around b-all">
	<p>You can also invoke the code completion window (Ctrl-Space) and see that the generated artifacts are available for picking them.
	Now, let's see that the project compiles and the generated artifacts can be called from other parts of the program.</p>
	</li>
	<li>Open the <tt>TestBooks.java</tt> file with the <em>main</em> method and add the following code (in bold) to create a new object of the <tt>MyBooks</tt> class.
	<pre class="examplecode">package testann;

	public class TestBooks {

	public static void main(String[] args) {
	<strong>MyBooks books = new MyBooks(2009, "My Beautiful Dream", "John Smith");</strong>
	}
	}</pre>
	</li>
	<li>Add the following code to print out the values of the <tt>books</tt> variable.
	<p>To return the values, we call the getter methods that were auto-generated by <tt>lombok.jar</tt>.
	While you are typing, note that the auto-generated artifacts are available from the code completion window.</p>
	<pre class="examplecode">package testann;

	public class TestBooks {

	public static void main(String[] args) {
	MyBooks books = new MyBooks(2009, "My Beautiful Dream", "John Smith");
	<strong>System.out.println("Year: " + books.getYear() + ", Title: " + books.getTitle() + ", Author: " + books.getAuthor());</strong>
	}
	}</pre>
	</li>
	<li>Save your changes.</li>
	<li>Right-click the project node in the Projects window and choose Run (F6).
	<p>When you run the application you should see the following output that
	shows that the application compiled successfully.</p>
	<img src="../../../images_www/articles/72/java/annotations/output.png" alt="screenshot of Output window" title="Output window after running the application" class="margin-around b-all"></li>
	</ol>
	<p>You can see that the artifacts generated by the Lombok annotation processor are accessible from other parts of the program.</p>


	<h2><a name="nextsteps"></a>Next Step </h2>
	<ul>
	<li>Java SE Documentation - <a href="http://download.oracle.com/javase/6/docs/technotes/guides/language/annotations.html" target="_blank">Annotations</a></li>
	<li>Java SE Tutorial - <a href="http://download.oracle.com/javase/tutorial/java/javaOO/annotations.html" target="_blank">Annotations</a> </li>
	<!--<li><a href="annotations-custom.html">Part II: Using Own Custom Annotation Processor in the IDE</a></li>-->
	</ul>
	<div class="feedback-box"><a href="/about/contact_form.html?to=3&subject=Feedback:%20Using%20the%20Annotation%20Processors%20Support%20in%20NetBeans%20IDE">Send Feedback on This Tutorial</a><br style="clear:both;" />
	</div>
	</body>
	</html>