我在getConnection后，从数据库select记录后
使用Connection.close()方法关闭连接，就出现了：
java.lang.StackOverflowError
at java.util.PropertyResourceBundle.handleGetObject(PropertyResourceBundle.java:105)
at java.util.ResourceBundle.getObject(ResourceBundle.java:376)
at java.util.ResourceBundle.getString(ResourceBundle.java:354)
at oracle.jdbc.dbaccess.Message11.msg(Message11.java:47)
at oracle.jdbc.dbaccess.DBError.findMessage(DBError.java:602)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:207)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:273)
at oracle.jdbc.driver.OracleConnection.rollback(OracleConnection.java:867)
at com.codestudio.sql.PoolManConnection.clean(Unknown Source)
at com.codestudio.sql.PoolManConnection.sendErrorEvent(Unknown Source)
at com.codestudio.sql.PoolManConnection.setAutoCommit(Unknown Source)
at com.codestudio.sql.PoolManConnection.clean(Unknown Source)
at com.codestudio.sql.PoolManConnection.sendErrorEvent(Unknown Source)
at com.codestudio.sql.PoolManConnection.setAutoCommit(Unknown Source)
at com.codestudio.sql.PoolManConnection.clean(Unknown Source)
at com.codestudio.sql.PoolManConnection.sendErrorEvent(Unknown Source)
at com.codestudio.sql.PoolManConnection.setAutoCommit(Unknown Source)
at com.codestudio.sql.PoolManConnection.clean(Unknown Source)
at com.codestudio.sql.PoolManConnection.sendErrorEvent(Unknown Source)
at com.codestudio.sql.PoolManConnection.setAutoCommit(Unknown Source)
at com.codestudio.sql.PoolManConnection.clean(Unknown Source)
at com.codestudio.sql.PoolManConnection.sendErrorEvent(Unknown Source)
at com.codestudio.sql.PoolManConnection.setAutoCommit(Unknown Source)
……
如果我不关闭Connection ，就不会出错了，有谁知道原因吗？请告之
谢谢！

cs = con.createStatement();
 rs = cs.getResultSet();
用如下方法关闭数据库试试（按顺序）
 if (rs != null) rs.close();
 if (cs != null) ps.close();
 if (con != null) con.close();

要看db类里怎么写了，给出bean代码！！！