java.lang.ArrayIndexOutOfBoundsException: 1 ?报错

conn.prepareStatement(sql)报错java.lang.ArrayIndexOutOfBoundsException: 1 

代码异常提示行localConn.prepareStatement(insertSql.toString());

报错信息：java.lang.ArrayIndexOutOfBoundsException: 1 

错误代码片段：

int colCount = 0;
							for (int i = 0; i < sourceRsmd.getColumnCount(); i++) {
								if(sourceRsmd.getColumnName(i + 1).equalsIgnoreCase("rn")){
									continue;
								}
								colCount++;
								insertSql.append(sourceRsmd.getColumnName(i + 1));
								insertSql.append(",");
								paramSql.append("?,");
							}
							insertSql = insertSql.delete(insertSql.length()-1, insertSql.length());
							insertSql.append(")");
							insertSql.append(" VALUES(");
							insertSql.append("?,");  // 额外增加一个参数占位符,用于维护时间戳字段
							paramSql = paramSql.delete(paramSql.length() -1 , paramSql.length());
							insertSql.append(paramSql.toString());
							insertSql.append(")");
							localPstmt = localConn.prepareStatement(insertSql.toString());