由于未指定ObjectWarpper，因此不会加载自定义EL函数

问题描述

我的Web应用程序使用Spring MVC和Freemarker.在启动后必须首先呈现网页(使用Freemarker 2.3.22)时，它会记录警告消息:

My web-application uses Spring MVC and Freemarker. When it must first render a web page (using Freemarker 2.3.22) after starting up, it logs a warning message:

 Custom EL functions won't be loaded because no ObjectWarpper was specified

(是，ObjectWarpper；错误消息有错字)

(Yes, ObjectWarpper; the error message has typo)

但是，我想我 do 在我的配置bean中指定了ObjectWrapper:

However, I think I do have an ObjectWrapper specified in my configuration bean:

 <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
    <property name="templateLoaderPath" value="/WEB-INF/views/" />
    <property name="freemarkerSettings">
       <props>
          <prop key="url_escaping_charset">UTF-8</prop>
          <prop key="object_wrapper">DefaultObjectWrapper(2.3.22)</prop>
       </props>
    </property>
 </bean>

那我该怎么做才能正确设置ObjectWrapper并防止记录此警告消息?

So what must I do to correctly set up an ObjectWrapper and prevent this warning message being logged?

如果使用default object_wrapper，我也会遇到同样的问题.

I have the same problem if I use a default object_wrapper.

推荐答案

这个问题也困扰着我，我检查了org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer类的源代码，发现没有初始化的taglibFactory设置了ObjectWrapper.

This problem also bothered me, I checked the source code of the org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer class and found the taglibFactory inited without ObjectWrapper being set.

因此，我扩展了FreeMarkerConfigurer类，并重写了getTaglibFactory()方法，并替换了spring mvc配置.这是我的代码:

So I extend the FreeMarkerConfigurer class and override the getTaglibFactory() method and replace the spring mvc config. Here is my code:

public class DefaultFreeMarkerConfigurer extends FreeMarkerConfigurer {
    @Override
    public TaglibFactory getTaglibFactory() {
        TaglibFactory tagLibFactory = super.getTaglibFactory();
        if (tagLibFactory.getObjectWrapper()==null) {
            tagLibFactory.setObjectWrapper(super.getConfiguration().getObjectWrapper());
        }
        return tagLibFactory;
    }
}

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