问题

ERROR 792 --- [nio-8080-exec-2] freemarker.runtime                       : Error executing FreeMarker template

freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> recomHouses  [in template "homepage/index.ftl" at line 107, column 27]

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Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
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FTL stack trace ("~" means nesting-related):
	- Failed at: #list recomHouses as house  [in template "homepage/index.ftl" at line 107, column 20]

截图：

原因

index.ftl文件中的这个值为空

解决办法

1、在此处添加if判断语句。就像日志提示的那样

<#if myOptionalVar??>when-present<#else>when-missing</#if>

2、在application.properties添加spring.freemarker.settings.classic_compatible=true一句即可。【推荐】