Trying to master Spring. I do everything on video Spring the Ripper , but nothing comes to the screen. Like the bean of the class InjectRandomIntAnnotationBeanPostProcessor simply ignored.

Please suggest what is the problem?

Bean itself:

 public class TerminatorQuoter implements Quoter { private String message; @InjectRandomInt(min = 2, max = 7) private int repeat; public void setMessage(String message) { this.message = message; } public void sayQuote() { for (int i = 0; i < repeat; i++) { System.out.println("message = s" + message); } }

Annotation:

 @Retention(RetentionPolicy.RUNTIME) public @interface InjectRandomInt { int min(); int max(); }

BeanPostProcessor:

 public class InjectRandomIntAnnotationBeanPostProcessor implements BeanPostProcessor { public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { Field[] fields = bean.getClass().getFields(); for (Field field : fields) { InjectRandomInt injectRandomInt = field.getAnnotation(InjectRandomInt.class); if (injectRandomInt != null){ int min = injectRandomInt.min(); int max = injectRandomInt.max(); Random random = new Random(); int randomInt = min + random.nextInt(max - min); field.setAccessible(true); ReflectionUtils.setField(field, bean, randomInt); } } return bean; } public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { return bean; }

XML:

 <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean class="quoters.InjectRandomIntAnnotationBeanPostProcessor"/> <bean class="quoters.TerminatorQuoter" id="terminatorQuoter"> <property name="message" value="I'll be back!!!"/> </bean>

Main.java (actually where the text comes from):

 public class Main { public static void main(String[] args) { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("context.xml"); context.getBean(TerminatorQuoter.class).sayQuote(); }
  • Any errors? - michael_best
  • No, just a blank screen (Process finished with exit code 0). IDE intellij idea where to look? - Vadim
  • IDE intellij idea - the most advanced, the error is clearly in the code - michael_best
  • try adding getter & setter - michael_best
  • and where did you get the code? or yourself? - michael_best

1 answer 1

Call bean.getClass().getFields(); returns only public fields. Replace this call with bean.getClass().getDeclaredFields(); .

  • It helped, thanks! Another question, is it possible to do without "ClassPathXmlApplicationContext context = ClassPathXmlApplicationContext (" context.xml "); context.getBean (TerminatorQuoter.class) .sayQuote ();"? For example, in Servlets, how to indicate that context.xml is used? - Vadim
  • @Vadim if the answer solved your problem, then you should accept it by clicking the check mark next to it. - Anton Sorokin
  • OK, done, thanks for the comments. - Vadim
  • @Vadim You can: baeldung.com/spring-web-contexts - Rostislav Krasny