关于在javabean中用自定义的javabean问题?

[zhmyyp]

小弟新学jsp,遇一项目，做了一个连接数据库的javabean--DBConnManager,另有一个bean--DataInput,欲在DataInput里使用DBConnManager，为什么总在调用DBConnManager中有操作数据库的函数时总是有如下错误：
500 Servlet Exception
Note: sun.tools.javac.Main has been deprecated.
D:\arcmanager\WEB-INF\classes\arc\DataInput.java:103: Exception java.io.UnsupportedEncodingException
must be caught, or it must be declared in the throws clause of this method.
ResultSet rs=db.executeQuery(sql);
^
D:\arcmanager\WEB-INF\classes\arc\DataInput.java:103: Exception java.sql.SQLException
must be caught, or it must be declared in the throws clause of this method.
ResultSet rs=db.executeQuery(sql);