{"id":98713,"date":"2019-09-30T07:00:23","date_gmt":"2019-09-30T04:00:23","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=98713"},"modified":"2019-09-27T11:32:05","modified_gmt":"2019-09-27T08:32:05","slug":"spring-lazy-annotation","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/09\/spring-lazy-annotation.html","title":{"rendered":"Spring @Lazy Annotation"},"content":{"rendered":"

Introduction:<\/h3>\n

The Spring framework, by default, loads and eagerly initializes all beans at the application startup itself.<\/strong> In our application, we might have some pretty resource-intensive beans. We\u2019ll prefer to load such beans on a need basis. We can achieve this using the Spring @Lazy<\/em> annotation.<\/p>\n

In this tutorial, we\u2019ll learn how to use @Lazy<\/em> annotation to lazily load our beans.<\/p>\n

Lazy Initialization:<\/h3>\n

If we mark our Spring configuration class with @Lazy<\/em> annotation, then all defined beans with @Bean <\/em>annotation will get lazily loaded:<\/strong><\/p>\n

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@Configuration<\/code><\/div>\n
@ComponentScan<\/code>(basePackages = <\/code>\"com.programmergirl.university\"<\/code>)<\/code><\/div>\n
@Lazy<\/code><\/div>\n
public<\/code> class<\/code> AppConfig {<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>@Bean<\/code><\/div>\n
    <\/code>public<\/code> Student student() {<\/code><\/div>\n
        <\/code>return<\/code> new<\/code> Student();<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>@Bean<\/code><\/div>\n
    <\/code>public<\/code> Teacher teacher() {<\/code><\/div>\n
        <\/code>return<\/code> new<\/code> Teacher();<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

We can also lazy load just a single bean by using this annotation at the method level:<\/p>\n

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@Bean<\/code><\/div>\n
@Lazy<\/code><\/div>\n
public<\/code> Teacher teacher() {<\/code><\/div>\n
    <\/code>return<\/code> new<\/code> Teacher();<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Testing Lazy Loading:<\/h3>\n

Let\u2019s quickly test out this functionality by running our application:<\/p>\n

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public<\/code> class<\/code> SampleApp {<\/code><\/div>\n
    <\/code>private<\/code> static<\/code> final<\/code> Logger LOG = Logger.getLogger(SampleApp.<\/code>class<\/code>);<\/code><\/div>\n
    <\/code>public<\/code> static<\/code> void<\/code> main(String args[]) {<\/code><\/div>\n
        <\/code>AnnotationConfigApplicationContext context = <\/code><\/div>\n
          <\/code>new<\/code> AnnotationConfigApplicationContext(AppConfig.<\/code>class<\/code>);<\/code><\/div>\n
        <\/code> <\/div>\n
        <\/code>LOG.info(<\/code>\"Application Context is already up\"<\/code>);<\/code><\/div>\n
 <\/code> <\/div>\n
        <\/code>\/\/ Beans in our Config class lazily loaded<\/code><\/div>\n
        <\/code>Teacher teacherLazilyLoaded = context.getBean(Teacher.<\/code>class<\/code>);<\/code><\/div>\n
        <\/code>Student studentLazilyLoaded = context.getBean(Student.<\/code>class<\/code>);<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

On our console, we\u2019ll see:

<\/div> <\/div><\/p>\n
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Bean factory <\/code>for<\/code> ...AnnotationConfigApplicationContext: <\/code><\/div>\n
...DefaultListableBeanFactory: [...]<\/code><\/div>\n
...<\/code><\/div>\n
Application Context is already up<\/code><\/div>\n
Inside Teacher Constructor<\/code><\/div>\n
Inside Student Constructor<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Clearly, Spring initialized both Student<\/em> and Teacher<\/em> beans on demand and not while setting up the application context.<\/strong><\/p>\n

With @Autowired<\/em> Annotation:<\/h3>\n

We can also use @Lazy<\/em> annotation at an injection point: constructor, setter or field-level. <\/strong><\/p>\n

Let\u2019s say we have a Classroom<\/em> class that we want to lazy-load:<\/p>\n

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\n
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@Component<\/code><\/div>\n
@Lazy<\/code><\/div>\n
public<\/code> class<\/code> Classroom {<\/code><\/div>\n
    <\/code>public<\/code> Classroom() {<\/code><\/div>\n
        <\/code>System.out.println(<\/code>\"Inside Classroom Constructor\"<\/code>);<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
    <\/code>...<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And it\u2019s wired to the University<\/em> bean via @Autowired<\/em> annotation:<\/p>\n

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01<\/div>\n
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@Component<\/code><\/div>\n
public<\/code> class<\/code> University {<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>@Lazy<\/code><\/div>\n
    <\/code>@Autowired<\/code><\/div>\n
    <\/code>private<\/code> Classroom classroom;<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>public<\/code> University() {<\/code><\/div>\n
        <\/code>System.out.println(<\/code>\"Inside University Constructor\"<\/code>);<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>public<\/code> void<\/code> useClassroomBean() {<\/code><\/div>\n
        <\/code>this<\/code>.classroom.getDetails(); <\/code><\/div>\n
        <\/code>...<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Here, we have lazily-injected the Classroom<\/em> bean.<\/strong> And so, while instantiating a University<\/em> object, Spring will create and map a proxy Classroom<\/em> object to it. Finally, when we invoke useClassroomBean()<\/em>, only then it\u2019ll create the actual Classroom<\/em> instance:<\/p>\n

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\/\/ in our main() method<\/code><\/div>\n
AnnotationConfigApplicationContext context<\/code><\/div>\n
  <\/code>= <\/code>new<\/code> AnnotationConfigApplicationContext(); <\/code><\/div>\n
 <\/code> <\/div>\n
LOG.info(<\/code>\"Application Context is already up\"<\/code>);<\/code><\/div>\n
 <\/code> <\/div>\n
University university = context.getBean(University.<\/code>class<\/code>);<\/code><\/div>\n
LOG.info(<\/code>\"Time to use the actual classroom bean...\"<\/code>);<\/code><\/div>\n
university.useClassroomBean();<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The above code will produce the following logs:<\/p>\n

\n
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\n
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Bean factory <\/code>for<\/code> ...AnnotationConfigApplicationContext:<\/code><\/div>\n
 <\/code>...DefaultListableBeanFactory: [...] ...<\/code><\/div>\n
Inside University Constructor<\/code><\/div>\n
... <\/code><\/div>\n
Application Context is already up<\/code><\/div>\n
Time to use the actual classroom bean...<\/code><\/div>\n
Inside Classroom Constructor<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

As we can see, the instantiation of the Classroom<\/em> object gets delayed until its actually needed.<\/p>\n

Please note that, for lazy-injection, we must use @Lazy<\/em> annotation on both the component class as well as the injection point.<\/strong><\/p>\n

Conclusion:<\/h3>\n

In this quick tutorial, we learned how to lazy load our Spring beans. We talked about lazy initialization and lazy injection.<\/p>\n

\n\n\n\n
\n

Published on Java Code Geeks with permission by Shubhra Srivastava, partner at our JCG program<\/a>. See the original article here: Spring @Lazy Annotation<\/a><\/p>\n

Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Introduction: The Spring framework, by default, loads and eagerly initializes all beans at the application startup itself. In our application, we might have some pretty resource-intensive beans. We\u2019ll prefer to load such beans on a need basis. We can achieve this using the Spring @Lazy annotation. In this tutorial, we\u2019ll learn how to use @Lazy …<\/p>\n","protected":false},"author":82253,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[30],"class_list":["post-98713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-spring"],"yoast_head":"\nSpring @Lazy Annotation - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about Lazy Annotation? 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