Freemarker TemplateLoader.findTemplateSource("WEB-INF/template/index.html"): Not found错误原因

Spring配置文件如下：

<bean id="freemarkerConfig"
class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
<property name="templateLoaderPath" value="/WEB-INF/tpl/" />
<property name="freemarkerSettings">
<props>
<prop key="template_update_delay">0</prop>
<prop key="default_encoding">UTF-8</prop>
<prop key="number_format">0.##########</prop>
<prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop>
<prop key="classic_compatible">true</prop>
<prop key="template_exception_handler">rethrow</prop>
<prop key="auto_import">/common/spring.ftl as spring</prop>
</props>
</property>
</bean>如果Spring的配置文件已经添加templateLoaderPath，SpringMVC中的Freemarker配置中的prefix不需要再进行配置或者留空就可以，否则就会报TemplateLoader.findTemplateSource("/WEB-INF/template/index.html"): Not found

<bean id="viewResolver"
class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
<property name="cache" value="false" />
<property name="prefix" value="" />
<property name="suffix" value=".html" />
<property name="contentType" value="text/html;charset=UTF-8"></property>
<property name="requestContextAttribute" value="request" />
<property name="exposeSpringMacroHelpers" value="true" />
<property name="exposeRequestAttributes" value="true" />
<property name="exposeSessionAttributes" value="true" />
</bean>