数据源问题

1.出现：
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.niit.Tool.TestDateSource.<clinit>(TestDateSource.java:20)
at com.niit.service.test1.main(test1.java:20)
Exception in thread "main" java.lang.NullPointerException
at com.niit.service.test1.main(test1.java:23)
解决：
用了数据库连接池的话，做测试只能在web上面做测试，因为连接池是部署到tomcat服务器上，不能用application做测试的