What is happening inside applicationContext.xml
问题 Will someone please explain what the following applicationContext.xml file is doing? For greater context, I get it from http://persistentdesigns.com/wp/jersey-spring-and-jpa/. Some of my questions (not exhaustive, since I really don't understand much): For id="dataSource" is dataSource a keyword or is it the name of the datasource I am to use? For example, if the name of my datasource is actuall learningRestDS, do I replace dataSource with learningRestDS ? Why is the datasource class name org