java 项目中遇到的错误
1.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 标签外面没有嵌套标签
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 ng.NullPointerException 2008-5-12 20:02:09 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
ng.NullPointerException
at
com.System.storage.action.FinishedAction.finishedCheckAdd(FinishedAct ion.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
"
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)*".
