Conflicting Spring bean attribute

<beans> <bean class="java.lang.String" factory-bean="factoryBean"/> <!-- Exactly one of 'class' or 'factory-bean' is required --> <bean factory-bean="factoryBean" id="missingFactoryMethod"/> <!-- When factory-bean exists, factory-method is required --> <!-- Attribute abstract with default value 'false' is superfluous --> <bean abstract="false" id="superfluousDefaultAttributeAbstract"/> <!-- Attribute scope with default value 'singleton' is superfluous --> <bean id="superfluousDefaultAttributeScope" scope="singleton"/> <bean class="java.lang.StringBuilder"> <property name="length"> <!-- Attributes id, name, and scope are superfluous --> <bean id="beanId" name="beanName" scope="prototype"/> </property> </bean> </beans>