java.lang.NullPointerException异常处理

最新推荐文章于 2023-01-17 15:06:53 发布

原创最新推荐文章于 2023-01-17 15:06:53 发布 · 715 阅读

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CC 4.0 BY-SA版权

文章标签：

#java #idea #jdbc

本文分析了Java应用中遇到的NullPointerException和IllegalArgumentException，焦点在于初始化JDBCUtils时未找到druid.properties文件。解决方法是确保资源目录下存在该文件。关键在于Spring Boot配置及资源管理。

异常：

java.lang.NullPointerException
	at java.util.Properties$LineReader.readLine(Properties.java:434)
	at java.util.Properties.load0(Properties.java:353)
	at java.util.Properties.load(Properties.java:341)
	at cn.itcast.util.JDBCUtils.<clinit>(JDBCUtils.java:24)
	at cn.itcast.dao.UserDao.<init>(UserDao.java:18)
	at cn.itcast.test.UserDaoTest.testLogin(UserDaoTest.java:17)
	at cn.itcast.test.UserDaoTest.main(UserDaoTest.java:10)
Exception in thread "main" java.lang.IllegalArgumentException: Property 'dataSource' is required
	at org.springframework.jdbc.support.JdbcAccessor.afterPropertiesSet(JdbcAccessor.java:152)
	at org.springframework.jdbc.core.JdbcTemplate.<init>(JdbcTemplate.java:166)
	at cn.itcast.dao.UserDao.<init>(UserDao.java:18)
	at cn.itcast.test.UserDaoTest.testLogin(UserDaoTest.java:17)
	at cn.itcast.test.UserDaoTest.main(UserDaoTest.java:10)