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Question

Кажется, что возникают издержки, когда включаемый файл очень большой. Это не имеет ничего общего с содержимым файла, только его размер, файл не имеет ничего, кроме закомментированного текста

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Время для вставки шаблона пропорционально размеру файла.

comments.jsp выглядит так:

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комментарий -%>

Answer 1

У меня была такая же проблема с Tomcat (версия 7). Я решил это, установив для параметра разработки в web.xml значение false.

<servlet>
        <servlet-name>jsp</servlet-name>
        <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
        <init-param>
            <param-name>development</param-name>
            <param-value>false</param-value>
        </init-param>
...
</servlet>