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- <title>@NonNull</title>
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- <div class="meat">
- <div class="header"><a href="../index.html">Project Lombok</a></div>
- <h1>@NonNull</h1>
- <div class="byline">or: How I learned to stop worrying and love the NullPointerException.</div>
- <div class="overview">
- <h3>Overview</h3>
- <p>
- <em>NEW in Lombok 0.11.10: </em>You can use <code>@NonNull</code> on the parameter of a method or constructor to have lombok generate a null-check statement for you.<br />
- </p><p>
- Lombok has always treated any annotation named <code>@NonNull</code> on a field as a signal to generate a null-check if lombok generates an entire method or constructor for you, via
- for example <a href="Data.html"><code>@Data</code></a>. Now, however, using lombok's own <code>@lombok.NonNull</code> on a parameter results in the insertion of just the null-check
- statement inside your own method or constructor.
- </p><p>
- The null-check looks like <code>if (param == null) throw new NullPointerException("param");</code> and will be inserted at the very top of your method. For constructors, the null-check
- will be inserted immediately following any explicit <code>this()</code> or <code>super()</code> calls.
- </p><p>
- If a null-check is already present at the top, no additional null-check will be generated.
- </p>
- </div>
- <div class="snippets">
- <div class="pre">
- <h3>With Lombok</h3>
- <div class="snippet">@HTML_PRE@</div>
- </div>
- <div class="sep"></div>
- <div class="post">
- <h3>Vanilla Java</h3>
- <div class="snippet">@HTML_POST@</div>
- </div>
- </div>
- <div style="clear: left;"></div>
- <div class="overview confKeys">
- <h3>Supported configuration keys:</h3>
- <dl>
- <dt><code>lombok.nonNull.exceptionType</code> = [<code>NullPointerException</code> | <code>IllegalArgumentException</code>] (default: <code>NullPointerException</code>).
- <dd>When lombok generates a null-check <code>if</code> statement, by default, a <code>java.lang.NullPointerException</code> will be thrown with the field name as the exception message.
- However, you can use <code>IllegalArgumentException</code> in this configuration key to have lombok throw that exception, with '<em>fieldName</em> is null' as exception message.</dd>
- <dt><code>lombok.nonNull.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)</dt>
- <dd>Lombok will flag any usage of <code>@NonNull</code> as a warning or error if configured.</dd>
- </dl>
- </div>
- <div class="overview">
- <h3>Small print</h3><div class="smallprint">
- <p>
- Lombok's detection scheme for already existing null-checks consists of scanning for if statements that look just like lombok's own. Any 'throws' statement as
- the 'then' part of the if statement, whether in braces or not, counts. The conditional of the if statement <em>must</em> look exactly like <code>PARAMNAME == null</code>.
- The first statement in your method that is not such a null-check stops the process of inspecting for null-checks.
- </p><p>
- While <code>@Data</code> and other method-generating lombok annotations will trigger on any annotation named <code>@NonNull</code> regardless of casing or package name,
- this feature only triggers on lombok's own <code>@NonNull</code> annotation from the <code>lombok</code> package.
- </p><p>
- A <code>@NonNull</code> on a primitive parameter results in a warning. No null-check will be generated.
- </p><p>
- A <code>@NonNull</code> on a parameter of an abstract method used to generate a warning; starting with version 1.16.8, this is no longer the case, to acknowledge the notion that <code>@NonNull</code> also has a
- documentary role. For the same reason, you can annotate a method as <code>@NonNull</code>; this is allowed, generates no warning, and does not generate any code.
- </p>
- </div>
- </div>
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