Spring configuration is best not to configure XSD version number!

Java technology stack 2020-11-10 09:12:45
spring configuration best configure xsd

author : Hengyun duanling

Why? dubbo There's no problem starting ?

This article blog From a question :

Our company made Ali's dubbo, It's been months since I hung up , Why is there no problem starting our app ? Our applications are Spring There is a similar configuration in the configuration file :

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"

We all know Spring At startup, it is necessary to verify XML Of documents . Or why Eclipse in xml No error prompt ?

Like this one Spring To configure :

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"

We can also add the version number after it :


XML Some of the concepts of

So first of all xml Some of the concepts of :

xml Of schema Are there in namespace, You can give it an alias . For example, the common spring Of namespace:


Usually ,namespace Corresponding URI It's a storage XSD The address of , Although there is no such requirement in the specification .

If not provided schemaLocation, that Spring Of xml The parser will start from namespace Of URI Load in XSD file . We can change the configuration file to look like this , It can also work normally :

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans/spring-beans.xsd"

schemaLocation Provides a xml namespace To the corresponding XSD A mapping of files , So we can see , stay xsi:schemaLocation The strings configured later are paired , The one in front is namespace Of URI, And then xsd Of documents URI. such as :


**Spring How to check XML Of ?

Spring The default is to load XSD File to verify xml Of documents , So if you're disconnected sometimes , Or some open source software switches domain names , So it's easy to run into applications that can't be started . I remember that time Oracle Acquisition Sun Company time , I've been in this situation .

To prevent this ,Spring Provides a mechanism , Load locally by default XSD file . open spring-context-3.2.0.RELEASE.jar, You can see that there are two special files inside :





And on again jar In the bag org/springframework/context/config/ Catalog , You can see below


Obviously , You can think of Spring It's a XSD The files have been put locally , And then spring.schemas There's a mapping in , Loading from local is preferred XSD file .

also Spring Very intimate. , Put the old version of XSD The papers are all out . This will prevent upgrades Spring edition , And the configuration file is still the old version of XSD file , And then it was disconnected , The app won't start .

We can still see that , When no version number is configured , It's the current version of XSD file :


Again , We turn on dubbo Of jar package , It can be in its spring.schemas You can see this configuration in the file :


therefore ,Spring In the load dubbo when , From dubbo Of jar Load in dubbo.xsd.

How to skip Spring Of XML check ?

You can skip validation in this way :

GenericXmlApplicationContext context = new GenericXmlApplicationContext();context.setValidating(false);

How to write your own spring xml namespace Expand ?

You can refer to Spring Documents , It's actually quite simple . Just realize your own NamespaceHandler, Configure it again spring.handlers and spring.schemas That's all right. .


Other things

prevent XSD One idea that failed to load


Complete Spring Of namespace A list of


summary :

Why not in Spring In the configuration of , Configuration XSD Version number of ?

Because if you don't configure the version number , Take the current jar Inside XSD file , It reduces all kinds of risks .
And it's elegant to have more conventions than configuration .

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