cannot expose session attribute '_from_source' because of an existing model object of the same name
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启动不报异常，访问报此异常：
cannot expose session attribute '_from_source' because of an existing model object of the same name
<property name="viewResolvers">
<list>
<bean id="velocityViewResolver" class="cn.bidlink.portal.common.velocity.BidVelocityViewResolver">
<property name="exposeSessionAttributes" value="true" /> <!-- 加上这句话就ok --->
</bean>
</list>
</property>
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