Question

I have use a .dtd to my applicationContext.xml, but now i want to use Spring’s AOP based on annotation. I’ve been told to add a in my applicationContext.xml.

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <aop:aspectj-autoproxy />
...

But something wrong happens. It seems that the file doesn’t recognize the aop node, so i think i should import one more .dtd file, and i find this:

<!DOCTYPE aspectj PUBLIC
        "-//AspectJ//DTD//EN" "http://www.eclipse.org/aspectj/dtd/aspectj.dtd">

but can i use both .dtd togeter? how?

thx

Answer 1

You don’t have to use DOCTYPE here, better declare xml namespaces like this:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

<beans>
    <aop:aspectj-autoproxy />
...

xmlns="http://www.springframework.org/schema/beans" means that beans will be root namespace (you don’t have to use <beans:bean>) and aop will be accesible as desired.