Tomcat和JDBC连接池

看起来您缺少

Context envCtx = (Context) initCtx.lookup("java:comp/env");

// Obtain our environment naming contextContext initCtx = new InitialContext();Context envCtx = (Context) initCtx.lookup("java:comp/env");// Look up our data sourceDataSource ds = (DataSource) envCtx.lookup("jdbc/EmployeeDB");// Allocate and use a connection from the poolConnection conn = ds.getConnection();

来自http://tomcat.apache.org/tomcat-7.0-doc/jndi-resources-
howto.html的文档。