java 项目中遇到的错误

sql错误

找不到列

Unknown column 'fillMen' in 'field list'

2.列名在sql语句中写了2次

Column 'fillMan' specified twice

3.下面2条 数据库插入对应的列都是int类型的 所插入的数据类型不符合要求时报错

Data truncated for column 'gatheringMoney' at row 1

Data truncation: Out of range value adjusted for column 'amount' at row 1

4.

Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause

5.修改一个表时无法取得同一个表的数据

ERROR 1093 (HY000): You can't specify target table 'context' for update in FROM

clause

6.主键 未自动增长

ERROR 1062 ：

7.int 类型字符过长

com.mysql.jdbc.exceptions.MySQLDataException: '2.5026744582E10' in column '1' is outside valid range for the datatype INTEGER.

8.没找到错误 没影响数据读取

java.sql.SQLException: Operation not allowed after ResultSet closed

9.类型错误 最常见的是数字类型错误

Data truncated for column 'gatheringMoney' at row 1

10.换另一个项目时 数据库连接池没换 （未解）

Name java: is not bound in this Context

换了之后 似乎还是不行

=====

java:/comp/env/jdbc/ConnSqlSer

前面多了一个'/'

应为java:comp/env/jdbc/ConnSqlSer

=======

11.\（未解）

java.sql.SQLException: QueryRunner requires a DataSource to be invoked in this way, or a Connection should be passed in

12.executeQuery()方法改成execute()（未解）

Can not issue data manipulation statements with executeQuery().

Can not issue data manipulation statements with executeQuery().

struts错误

Failed to obtain specified collection 下拉框没值

警告: No FormBeanConfig found under 'yuanLiaoRuKuForm' 配置文件Form出错

Cannot find bean: "org.apache.struts.taglib.html.BEAN" in any scope

<html:text >标签外面没有嵌套<html:form >标签

No getter method for property: "outDate" of bean: "com.System.storage.form.YuanliaoPandianForm"

在form里面没有定义 此字段的get方法

Cannot get a connection, pool error Timeout waiting for idle object 数据库错误

Operation not allowed after ResultSet closed 可能是结果集关闭了

//在Action里面调用的DAO类 没有进行重新实例化

2008-5-12 20:02:09 org.apache.struts.action.RequestProcessor processException

警告: Unhandled Exception thrown: class java.lang.NullPointerException

2008-5-12 20:02:09 org.apache.catalina.core.StandardWrapperValve invoke

严重: Servlet.service() for servlet action threw exception

java.lang.NullPointerException

at com.System.storage.action.FinishedAction.finishedCheckAdd(FinishedAction.java:151)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

//在C标签里从一个对象里取值时 ， 所请求的是对象里没有的属性

An error occurred while evaluating custom action attribute "value" with value "${rows.storageAmount}": Unable to find a value for "storageAmount" in object of class "com.System.storage.domain.Finished" using operator "." (null)

forward 转向 连接到了一个还没开始写的action里面 而那个action所对应的jsp页面还没改

Resources cannot be null.

找不到下面这个action

Cannot retrieve mapping for action /finished/finishedChuKuSearch

Cannot retrieve mapping for action /purveyAdd 如果把jsp页面的action写错了 就这样报

/jspfinance/client/ShouKuanJiLu_Sel.jsp(172,0) The end tag "</html:form" is unbalanced

类型转换错误 一般是参数类型写错 在公共方法或者配置文件里面找

com.System.finance.client.form.GatheringForm cannot be cast to com.System.finance.client.form.InvoiceForm

struts标签里面 写进了html标签内的属性

/jspclient/KeHuDangAn_Ins.jsp(44,88) equal symbol expected

/jspfinance/client/TuiHuanHuo_Ins.jsp(70,42) quote symbol expected

/jspstorage/material/YuanLiaoChuKu_Ins.jsp(84,31) equal symbol expected

org.apache.jasper.JasperException: /scDept/dingDanXinZeng.jsp(333,167) equal symbol expected

jsp页面上action写错了

Cannot retrieve mapping for action /finished/finishedCheckAdd

配置文件出错

The content of element type "action-mappings" must match "(action)*".