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In order to generate functional remote references, Java RMI servers must be able to supply a fully qualified hostname or IP address that is resolvable from all Java RMI clients (an example of a fully qualified hostname is foo.bar.com). If a Java RMI program provides a remote callback operation, then that program serves a Java RMI object and consequently, must be able to determine a resolvable hostname to use as its server hostname in the remote references it passes to Java RMI clients. VMs that make calls to applets that serve remote objects may throwUnknownHostExceptions because the applet has failed to provide a usable server hostname.

If your Java RMI application throws an UnknownHostException, you can look at the resulting stack trace to see if the hostname that the client is using to contact its remote server is incorrect or not fully qualified.【 If necessary, you can set the java.rmi.server.hostname property on the server to the correct IP address or hostname of the server machine and Java RMI will use this property's value to generate remote references to the server.】

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一、通过MySQL-Front或mysql administrator连接mysql的时候发生的这个错误

ERROR 1130: Host ***.***.***.*** is not allowed to connect to this MySQL server

说明所连接的用户帐号没有远程连接的权限，只能在本机(localhost)登录。

需更改 mysql 数据库里的 user表里的 host项
把localhost改称%

首先按下面的步骤登录Mysql服务器

登录mysql需要切换到dos下的mysql的bin目录，进行如下操作：

语法格式：mysql -h host_name -u user_name -p password   （本机的话-h 和host_name可省）

例如：

C:\program files\mysql\mysql server 5.0\bin>mysql -u root -p
Enter password:******
先输入用户名和密码登陆要求（-p），回车后等出现"Enter password:"，再输入密码回车，这样就可以
成功登陆mysql，否则将会登陆失败。

登陆成功后会显示如下信息及Mysql标识符：

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1 to server version: 5.0.1-nt

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql>


标识符"mysql>"，当你看到这个出现在窗口的最左边的顶格时，这就是告诉你，你可以输入命令进行操作了。

mysql> \s 查看版本信息
mysql> \q or mysql> quit 退出mysql数据库服务器
mysql> \h or mysql> help 查看帮助（其他的数据库服务器相关命令）

二、登录成功后可通过以下步骤对用户进行权限更改

mysql>use mysql;

mysql>update user set host = '%'   where user ='root';

mysql>flush privileges;

mysql>select 'host','user' from user where user='root';

mysql>quit


退出后会回到DOS正常的提示符状态，此时可以通过远程连接Mysql了！

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MySQL上的一个数据库要备份，装了个MySQL的gui工具。打开"MySQL Administrator"工具，填好用户名和密码却登录不了，老是报这个错“ERROR 1130: Host 'lijuan-' is not allowed to connect to this MySQL server”。网上查了下，有这两个方法解决： 解决方法：
1。 改表法。可能是你的帐号不允许从远程登陆，只能在localhost。这个时候只要在localhost的那台电脑，登入mysql后，更改 "mysql" 数据库里的 "user" 表里的 "host" 项，从"localhost"改称"%"
mysql -u root -pvmwaremysql>use mysql;mysql>update user set host = '%' where user = 'root';mysql>select host, user from user;
2. 授权法。例如，你想myuser使用mypassword从任何主机连接到mysql服务器的话。
GRANT ALL PRIVILEGES ON *.* TO IDENTIFIED BY 'mypassword' WITH GRANT OPTION; 如果你想允许用户myuser从ip为192.168.1.3的主机连接到mysql服务器，并使用mypassword作为密码 GRANT ALL PRIVILEGES ON *.* TO IDENTIFIED BY 'mypassword' WITH GRANT OPTION;      我的mysql.user里root用户的host果然是localhost，先用改表法给localhost改成“％”，还是不行，仍然报1130的错误，又按“从任何主机连接到mysql服务器”方法授权，还是报一样的错，最后给自己的ip授权之后，终于登录上了。。。。

     乎乎。。。

mysql的ERROR 1045 在上面情况后如再出现客户段1045可在服务器执行如下

UPDATE user SET Password=PASSWORD('123456') where USER='myuser';
FLUSH PRIVILEGES;

一个报错例子如下：

ORA-1688: unable to extend table RMMCDR.LOCAL_CDR partition LOCAL_CDR101 by 460800 in tablespace CDRS101

相应的英文如下：

Cause: An extent could not be allocated for a table segment in tablespace

Action: Use the ALTER TABLESPACE ADD DATAFILE statement to add one or more files to the specified tablespace

在使用hibernate3.6.2是我遇到了一个有趣的错误java.lang.NoSuchFieldError: INSTANCEat org.hibernate.type.BasicTypeRegistry.<init>(BasicTypeRegistry.java:94)at org.hibernate.type.TypeResolver.<init>(TypeResolver.java:59)at org.hibernate.cfg.Configuration.<init>(Configuration.java:249)at org.hibernate.cfg.Configuration.<init>(Configuration.java:300)

去掉hibernate-annotations.jar已经包含在hibernate3.jar中了

将这些jar包删除了即可。

<struts>
    <bean type="com.opensymphony.xwork2.ObjectFactory" name="spring" class="org.apache.struts2.spring.StrutsSpringObjectFactory" />
    
    <!--  Make the Spring object factory the automatic default -->
    <constant name="struts.objectFactory" value="spring" />   
<package name="spring-default">
        <interceptors>
            <interceptor name="autowiring" class="com.opensymphony.xwork2.spring.interceptor.ActionAutowiringInterceptor"/>
            <interceptor name="sessionAutowiring" class="org.apache.struts2.spring.interceptor.SessionContextAutowiringInterceptor"/>
        </interceptors>
    </package>   
</struts>