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Required Property Not Set Exception

File: context.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"     "http://www.springframework.org/dtd/spring-beans.dtd"> <beans>    <bean id="nameClass"          class="InitializingBeanNameClass"/> </beans> File: Main.java import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.InitializingBean; import org.springframework.beans.factory.xml.XmlBeanFactory; import org.springframework.core.io.ClassPathResource; public class Main {   public static void main(String[] args) throws Exception {     BeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("context.xml"));     InitializingBeanNameClass nameClass = (InitializingBeanNameClass) beanFactory         .getBean("nameClass");     System.out.println(nameClass.getFirstName());   } } class InitializingBeanNameClass implements InitializingBean {   private String firstName;   public String getFirstName() {     return this.firstName;   }   public void setFirstName(String firstName) {     this.firstName = firstName;   }   public void afterPropertiesSet() throws Exception {     if (this.firstName == null) {       throw new Exception("firstName property is required.");     }   } }