在 Java 语言中，程序运行出错被称为出现异常（Exception）。 异常是程序运行过程中发生的事件，该事件可以中断程序指令的 正常执行流程。 O Java 异常分为两大类 1. 错误（Error）是指 JVM 系统内部错误、资源耗尽等严重情 况。 2. 违例（Exception）则是指其他因编程错误或偶然的外在因 素导致的一般性问题，例如对负数开平方根、空指针访问、 试图读取不存在的文件以及网络连接中断等。 在 Java 语言中，程序运行出错被称为出现异常（Exception）。 异常是程序运行过程中发生的事件，该事件可以中断程序指令的 正常执行流程。 O Java 异常分为两大类 1. 错误（Error）是指 JVM 系统内部错误、资源耗尽等严重情 况。 2. 违例（Exception）则是指其他因编程错误或偶然的外在因 素导致的一般性问题，例如对负数开平方根、空指针访问、 试图读取不存在的文件以及网络连接中断等。 成一个相应的异常类对象，然后再将它交给运行时系统。 ▶ 运行时系统再寻找相应的代码来处理这一异常。如果 Java 运行时系统找不到可以处理异常的代码，则运行时系统将终 止，相应的 Java 程序也将退出。 ▶ 程序员通常对错误（Error）无能为力，因而一般只处理违 例 (Exception)。 大纲 异常的概念及分类 Java 异常处理机制 Java 异常处理机制 ▶ Java 程序执行过程中如出现异常，系统会监测到并自动生

SetHandler server-status Require 127.0.0.1 access.log - GET /server-status 403 127.0.0.1 error.log - AH01797: client denied by server configuration: /var/www/html/server-status Why httpd denies the size overhead added by the compression is larger than the data to be compressed. Multi-language error documents from 2.2.x may not work unless they are adjusted to the new syntax of mod_include's #if #if expr= element or the directive SSILegacyExprParser is enabled for the directory containing the error documents. The functionality provided by mod_authn_alias in previous versions (i.e., the AuthnProviderAlias

is now built with support for files larger than 2GB on modern 32- bit Unix systems. Support for handling >2GB request bodies has also been added. Event MPM The event MPM uses a separate thread to handle provider scheme which greatly eases the construction of new authentication backends. Connection Error Logging A new function, ap_log_cerror has been added to log errors that occur with the client's connection required for some third-party modules on platforms with small default thread stack size. Protocol handling for output filters In the past, every filter has been responsible for ensuring that it generates

is now built with support for files larger than 2GB on modern 32- bit Unix systems. Support for handling >2GB request bodies has also been added. Event MPM The event MPM uses a separate thread to handle provider scheme which greatly eases the construction of new authentication backends. Connection Error Logging A new function, ap_log_cerror has been added to log errors that occur with the client's connection required for some third-party modules on platforms with small default thread stack size. Protocol handling for output filters In the past, every filter has been responsible for ensuring that it generates

is now built with support for files larger than 2GB on modern 32- bit Unix systems. Support for handling >2GB request bodies has also been added. Event MPM The event MPM uses a separate thread to handle provider scheme which greatly eases the construction of new authentication backends. Connection Error Logging A new function, ap_log_cerror has been added to log errors that occur with the client's connection required for some third-party modules on platforms with small default thread stack size. Protocol handling for output filters In the past, every filter has been responsible for ensuring that it generates

is now built with support for files larger than 2GB on modern 32- bit Unix systems. Support for handling >2GB request bodies has also been added. Event MPM The event MPM uses a separate thread to handle provider scheme which greatly eases the construction of new authentication backends. Connection Error Logging A new function, ap_log_cerror has been added to log errors that occur with the client's connection required for some third-party modules on platforms with small default thread stack size. Protocol handling for output filters In the past, every filter has been responsible for ensuring that it generates

the size overhead added by the compression is larger than the data to be compressed. Multi-language error documents from 2.2.x may not work unless they are adjusted to the new syntax of mod_include's #if #if expr= element or the directive SSILegacyExprParser is enabled for the directory containing the error documents. The functionality provided by mod_authn_alias in previous versions (i.e., the AuthnProviderAlias moved from the core to mod_filter, which must be loaded. Errors serving requests: configuration error: couldn't check user: /path - load module mod_authn_core. .htaccess files aren't being processed -

SetHandler server-status Require 127.0.0.1 access.log - GET /server-status 403 127.0.0.1 error.log - AH01797: client denied by server configuration: /var/www/html/server-status Why httpd denies the size overhead added by the compression is larger than the data to be compressed. Multi-language error documents from 2.2.x may not work unless they are adjusted to the new syntax of mod_include's #if #if expr= element or the directive SSILegacyExprParser is enabled for the directory containing the error documents. The functionality provided by mod_authn_alias in previous versions (i.e., the AuthnProviderAlias