解决“The Apache Portable Runtime which allows optimal performance in production environments was not found on the java.library.pat
解决“The Apache Portable Runtime which allows optimal performance in production environments was not found on the java.library.path:”
问题：
开发工具Eclipse、Tomcat5.5
在启动Tomcat5.5时，控制台提示“The Apache Portable Runtime which allows optimal performance in production environments was not found on the java.library.path:”（...你的系统环境PATH路径...）
解决：
Tomcat从5.5版本后增加了APR技术（Apache Portable Runtime），这是一个用C语言写成文件包，目的在于提高Tomcat的服务性能，从而使得Tomcat将不仅仅担任一个容器的功能，而是要成为一个一般的web服务器（general purpose webserver）。
首先要到Tomcat网站上去下载：http://tomcat.apache.org/download-native.cgi 找到Native 1.1.13 Source Release zip这是个源文件，如果你要自己编译就下这个，如果想使用已编译好的dll文件就点击这个链接下面的“Here“链接，(或者直接点击这个链接http://apache.etoak.com/tomcat/tomcat-connectors/native/1.1.16/binaries/win32/
)找一个版本号最新的，进去可以下载一个tcnative-1.dll文件。
配置：
将文件放到Tomcat安装路径下，%CATALINA_HOME%/bin中
参阅：
http://tomcat.apache.org/tomcat-5.5-doc/apr.html
Tomcat can use the Apache Portable Runtime to provide superior scalability, performance, and better integration with native server technologies. The Apache Portable Runtime is a highly portable library that is at the heart of Apache HTTP Server 2.x. APR has many uses, including access to advanced IO functionality (such as sendfile, epoll and OpenSSL), OS level functionality (random number generation, system status, etc), and native process handling (shared memory, NT pipes and Unix sockets).
These features allows making Tomcat a general purpose webserver, will enable much better integration with other native web technologies, and overall make Java much more viable as a full fledged webserver platform rather than simply a backend focused technology.
发现 Tomcat 可以用 Apache Portable Runtime 来提供更强性能，提升Web静态页面的处理能力，不再需要专门的Web Server来处理静态页面了。
但是APR的支持需要安装三个本地组件
APR support requires three main native components to be installed:
1、APR library
2、JNI wrappers for APR used by Tomcat (libtcnative)
3、OpenSSL libraries