搭建JavaEE项目是遇到的几个问题

问题描述：无法读取spring mvc的xsd文件

参考http://eric-yan.iteye.com/blog/1908470

schema_reference.4: Failed to read schema document 'http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd', because 1)  could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

可能是eclipse的问题，代码没问题，只需要格式化一下，alt+s+f

问题2：

问题描述：No mapping found for HTTP request with URI

参考：http://blog.sina.com.cn/s/blog_534f69a00101332u.html

在springMVC配置文件中加入：<mvc:default-servlet-handler/>

问题3：

问题描述：Cannot create JDBC driver of class ''

读取到的jdbc driver class name为空

用Dbcp2的BasicDataSource，  配置如下：

#driver=oracle.jdbc.OracleDriver
driverClassName=oracle.jdbc.OracleDriver
# driver.OracleDriver is compatible with oracle 8i
url=jdbc:oracle:thin:@localhost:/xe
# former name jdbc.user is i    nappropriate, use jdbc.username instead. BasicDataSource swallow a properties file that must conform to this naming.
username=louis
password=louis

pro.load(DBUtil.class.getClassLoader().getResourceAsStream("/config/db/db.properties"));

ds = BasicDataSourceFactory.createDataSource(pro);//得到一个连接池对象
但是传入的参数pro中配置的driver而不是driverClassName而导致的问题