今天在spring-habse.xml引用外部檔案時報錯

報錯資訊：Caused by: org.xml.sax.SAXParseException; lineNumber: 11; columnNumber: 75; cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'context:property-placeholder'.

解決方法：

1. 在檔案頭中引入：xmlns:context="http://www.springframework.org/schema/context"

2. 在xsi:schemaLocation這個字串中新增context相關的解析檔案 
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-4.2.xsd。