Org. xml. Sax. saxparseexception: cvc-elt.1: cannot find the declaration of element 'beans'

When starting spring, the following error is reported,

The reason is that the configuration of spring XSD versions is inconsistent in XML. I use spring-2.5.6, but the configuration file is configured with 3.0. Change it to the following:

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <beans xmlns = "http://www.springframework.org/schema/beans" <br/> xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" <br/> xsi: schemalocation = "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> 

In addition, pay attention to the encoding of the configuration file during configuration; otherwise, when compiling, the output encoding is inconsistent with the encoding of your configuration file, file garbled characters will be generated.