问题
I am trying to get Spring working with tomcat JNDI resource to access my database. My project works if a META-INF/context.xml in my project with the resource information but once I remove it it stops.. why.
回答1:
If you deploy a Web application in Tomcat, in the deployment process, Tomcat will copy the META-INF/context.xml file in $CATALINA_HOME/conf/ so the context will be available for your application. Take in mind, that if you remove context.xml from you application because you dont want it, you also have to delete it manually from $CATALINA_HOME/conf/
If you have edited the server.xml for including your dababase resource and is not working when you remove context.xml it could be because you made some mistake defining your resourde in server.xml
UPDATED:
When resource is in server.xml, in context you should make a reference to global resource in server.xml. For example:
<Context crossContext="true" reloadable="true" >
<ResourceLink name="jdbc/myApp" type="javax.sql.DataSource" global="jdbc/myApp" />
</Context>
回答2:
This is unrelated to Spring.
To use JNDI you are expected to define the various resources either as global configuration or as application specifici configuration. For example JNDI DataSource Configuration
Why do you expect it to work in any other case? How would Tomcat know which resources to provide if you don't define them?
UPDATE:
You define a resouce in your server.xml but you have to associate the resource with your web application. That is why you also need to modify context.xml
来源：https://stackoverflow.com/questions/9843183/spring-using-jndi-with-tomcat-why-do-i-need-a-meta-inf-context-xml-in-my-proj