Spring 1.*
<bean id="hibernateSessionFactory" class="org.hibernate.admin.component.HibernateSessionFactory" init-method="init" destroy-method="dispose" singleton="true">
Spring 2.0
spring-beans-2.0.dtd/xsd does not support singleton="true"/"false" anymore. Use scope="singleton/"prototype" instead!
<bean id="hibernateSessionFactory" class="org.hibernate.admin.component.HibernateSessionFactory" init-method="init" destroy-method="dispose" scope="singleton">
如果在spring2.0中使用spring1.*的單例屬性即會報錯：org.xml.sax.SAXParseException: cvc-complex-type.3.2.2: Attribute 'singleton' is not allowed to appear in element 'bean'.
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