学习笔记：java.lang.ExceptionInInitializerError

private static LinkedList<Connection> list;

static{
try{
InputStream in = JdbcPool.class.getClassLoader().getResourceAsStream("db.properties");
Properties prop = new Properties();
prop.load(in);

String driver = prop.getProperty("driver");
String url = prop.getProperty("url");
String username = prop.getProperty("name");
String password = prop.getProperty("password");

Class.forName(driver);

for(int i=0;i<10;i++){
Connection conn = DriverManager.getConnection(url, username, password);
list.add(conn); //这里报错 空指针异常
}
}catch(Exception e){
throw new RuntimeException(e);
}
}

private static LinkedList<Connection> list = new LinkedList<Connection>();