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class="crayons-article__header__meta"> <div class="flex s:items-start flex-col s:flex-row"> <div id="action-space" class="crayons-article__actions mb-4 s:mb-0 s:order-last"></div> <div class="flex flex-1 mb-5 items-start"> <div class="relative"> <a href="/eidher"><img class="radius-full align-middle" src="https://media2.dev.to/dynamic/image/width=50,height=50,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F363362%2F3fad91dc-9a48-4c3c-91a8-05e3b4561bd1.jpeg" width="40" height="40" alt="eidher" /></a> </div> <div class="pl-3 flex-1"> <a href="/eidher" class="crayons-link fw-bold">eidher</a> <p class="fs-xs color-base-60"> Posted on <time datetime="2020-10-03T22:07:13Z" class="date">Oct 3, 2020</time> • Edited on <time datetime="2023-02-20T17:11:47Z" class="date">Feb 20, 2023</time> </p> </div> </div> </div> <div class="multiple_reactions_engagement"> <span class="reaction_engagement_like hidden"> <img src="https://assets.dev.to/assets/sparkle-heart-5f9bee3767e18deb1bb725290cb151c25234768a0e9a2bd39370c382d02920cf.svg" width="24" height="24" /> <span id="reaction_engagement_like_count"> </span> </span> <span class="reaction_engagement_unicorn hidden"> <img src="https://assets.dev.to/assets/multi-unicorn-b44d6f8c23cdd00964192bedc38af3e82463978aa611b4365bd33a0f1f4f3e97.svg" width="24" height="24" /> <span id="reaction_engagement_unicorn_count"> </span> </span> <span class="reaction_engagement_exploding_head hidden"> <img src="https://assets.dev.to/assets/exploding-head-daceb38d627e6ae9b730f36a1e390fca556a4289d5a41abb2c35068ad3e2c4b5.svg" width="24" height="24" /> <span id="reaction_engagement_exploding_head_count"> </span> </span> <span class="reaction_engagement_raised_hands hidden"> <img src="https://assets.dev.to/assets/raised-hands-74b2099fd66a39f2d7eed9305ee0f4553df0eb7b4f11b01b6b1b499973048fe5.svg" width="24" height="24" /> <span id="reaction_engagement_raised_hands_count"> </span> </span> <span class="reaction_engagement_fire hidden"> <img src="https://assets.dev.to/assets/fire-f60e7a582391810302117f987b22a8ef04a2fe0df7e3258a5f49332df1cec71e.svg" width="24" height="24" /> <span id="reaction_engagement_fire_count"> </span> </span> </div> <h1 class=" fs-3xl m:fs-4xl l:fs-5xl fw-bold s:fw-heavy lh-tight mb-2 medium"> Spring Expression Language (SpEL) </h1> <div class="spec__tags flex flex-wrap"> <a class="crayons-tag " style=" --tag-bg: rgba(59, 73, 223, 0.10); --tag-prefix: #3b49df; --tag-bg-hover: rgba(59, 73, 223, 0.10); --tag-prefix-hover: #3b49df; " href="/t/spring"><span class="crayons-tag__prefix">#</span>spring</a> <a class="crayons-tag " style=" --tag-bg: rgba(126, 72, 16, 0.10); --tag-prefix: #7e4810; --tag-bg-hover: rgba(126, 72, 16, 0.10); --tag-prefix-hover: #7e4810; " href="/t/java"><span class="crayons-tag__prefix">#</span>java</a> <a class="crayons-tag " style=" --tag-bg: rgba(59, 73, 223, 0.10); --tag-prefix: #3b49df; --tag-bg-hover: rgba(59, 73, 223, 0.10); --tag-prefix-hover: #3b49df; " href="/t/spel"><span class="crayons-tag__prefix">#</span>spel</a> </div> </div> </header> <div class="crayons-article__main "> <nav class="series-switcher crayons-card crayons-card--secondary"> <header class="crayons-card__header"> <h2 class="crayons-subtitle-2"> <a href="/eidher/series/21942">Spring Framework (24 Part Series)</a> </h2> </header> <div class="series-switcher__list"> <a href="/eidher/dependency-injection-using-spring-ckk" class="crayons-link crayons-link--contentful series-switcher__link " data-preload-image="" title="Published Sep 27 '20"> <span class="series-switcher__num">1</span> <span class="series-switcher__title">Spring Configuration</span> </a> <a href="/eidher/external-properties-in-spring-4hb4" class="crayons-link crayons-link--contentful series-switcher__link " data-preload-image="" title="Published Oct 3 '20"> <span class="series-switcher__num">2</span> <span class="series-switcher__title">External Properties in Spring</span> </a> <a href="/eidher/profiles-in-spring-490p" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--active series-switcher__link--inbetween" data-preload-image="" id="collection-link-inbetween" data-no-instant title="View more"> <span class="series-switcher__num">...</span> <span class="series-switcher__title">20 more parts...</span> </a> <a href="/eidher/profiles-in-spring-490p" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Oct 3 '20"> <span class="series-switcher__num">3</span> <span class="series-switcher__title">Profiles in Spring</span> </a> <a href="/eidher/spring-expression-language-spel-32fa" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--active series-switcher__link--hidden" data-preload-image="" title="Published Oct 3 '20"> <span class="series-switcher__num">4</span> <span class="series-switcher__title">Spring Expression Language (SpEL)</span> </a> <a href="/eidher/how-spring-implements-singleton-beans-2332" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Oct 3 '20"> <span class="series-switcher__num">5</span> <span class="series-switcher__title">How Spring implements Singleton Beans</span> </a> <a href="/eidher/converting-explicit-into-implicit-configuration-in-spring0-316i" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Oct 5 '20"> <span class="series-switcher__num">6</span> <span class="series-switcher__title">Converting explicit into implicit configuration in Spring</span> </a> <a href="/eidher/autowiring-in-spring-f89" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Oct 5 '20"> <span 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class="series-switcher__num">13</span> <span class="series-switcher__title">Spring AOP</span> </a> <a href="/eidher/caching-in-spring-m1e" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Oct 17 '20"> <span class="series-switcher__num">14</span> <span class="series-switcher__title">Caching in Spring</span> </a> <a href="/eidher/spring-jdbc-4d3i" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Oct 18 '20"> <span class="series-switcher__num">15</span> <span class="series-switcher__title">Spring JDBC</span> </a> <a href="/eidher/spring-transaction-management-bm0" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Oct 24 '20"> <span class="series-switcher__num">16</span> <span class="series-switcher__title">Spring Transaction Management</span> </a> <a href="/eidher/jpa-with-spring-6il" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Oct 25 '20"> <span class="series-switcher__num">17</span> <span class="series-switcher__title">JPA with Spring</span> </a> <a href="/eidher/jpa-with-spring-boot-p65" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Nov 8 '20"> <span class="series-switcher__num">18</span> <span class="series-switcher__title">JPA with Spring Boot</span> </a> <a href="/eidher/spring-web-mvc-3adg" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Nov 9 '20"> <span class="series-switcher__num">19</span> <span class="series-switcher__title">Spring Web MVC</span> </a> <a href="/eidher/spring-boot-for-war-447" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Nov 10 '20"> <span class="series-switcher__num">20</span> <span class="series-switcher__title">Spring Boot for war</span> </a> <a href="/eidher/spring-mvc-rest-196h" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Nov 11 '20"> <span class="series-switcher__num">21</span> <span class="series-switcher__title">Spring MVC REST</span> </a> <a href="/eidher/reactive-spring-applications-1d47" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--hidden" data-preload-image="" title="Published Nov 16 '20"> <span class="series-switcher__num">22</span> <span class="series-switcher__title">Reactive Spring Applications</span> </a> <a href="/eidher/spring-security-ejk" class="crayons-link crayons-link--contentful series-switcher__link " data-preload-image="" title="Published Nov 21 '20"> <span class="series-switcher__num">23</span> <span class="series-switcher__title">Spring Security</span> </a> <a href="/eidher/spring-injection-types-c6d" class="crayons-link crayons-link--contentful series-switcher__link " data-preload-image="" title="Published Jan 11 '21"> <span class="series-switcher__num">24</span> <span class="series-switcher__title">Spring Injection Types</span> </a> </div> </nav> <div class="crayons-article__body text-styles spec__body" data-article-id="473873" id="article-body"> <p>You can use it as implicit references defining an attribute or an argument in a method:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight java"><code><span class="nd">@Value</span><span class="o">(</span><span class="s">"#{ systemProperties['user.region'] }"</span><span class="o">)</span> <span class="nc">String</span> <span class="n">defaultLocale</span><span class="o">;</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-on"><title>Enter fullscreen mode</title> <path d="M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-off"><title>Exit fullscreen mode</title> <path d="M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z"></path> </svg> </div> </div> </div> <p>SpEL can access Spring beans:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight java"><code><span class="nd">@Value</span><span class="o">(</span><span class="s">"#{beanId.method}"</span><span class="o">)</span> <span class="nc">BeanType</span> <span class="n">param</span><span class="o">;</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-on"><title>Enter fullscreen mode</title> <path d="M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-off"><title>Exit fullscreen mode</title> <path d="M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z"></path> </svg> </div> </div> </div> <p>SpEL can access properties as Strings (casting may be needed):<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight java"><code><span class="nd">@Value</span><span class="o">(</span><span class="s">"${property1}"</span><span class="o">)</span> <span class="kt">int</span> <span class="n">property1</span><span class="o">;</span> <span class="nd">@Value</span><span class="o">(</span><span class="s">"#{environment['property2']}"</span><span class="o">)</span> <span class="kt">int</span> <span class="n">property2</span><span class="o">;</span> <span class="nd">@Value</span><span class="o">(</span><span class="s">"#{new Integer(environment['property3'])*2}"</span><span class="o">)</span> <span class="kt">int</span> <span class="n">property3</span><span class="o">;</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-on"><title>Enter fullscreen mode</title> <path d="M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-off"><title>Exit fullscreen mode</title> <path d="M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z"></path> </svg> </div> </div> </div> <p>If undefined use : or ?: for SpEL to assign a default value:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight java"><code><span class="nd">@Value</span><span class="o">(</span><span class="s">"${property1 : 1}"</span><span class="o">)</span> <span class="kt">int</span> <span class="n">property1</span><span class="o">;</span> <span class="nd">@Value</span><span class="o">(</span><span class="s">"#{environment['property2'] ?: 1}"</span><span class="o">)</span> <span class="kt">int</span> <span class="n">property2</span><span class="o">;</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div 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