今天將tomcat6換成tomcat7時，出現以下的資訊。

The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/amd64/server:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/amd64:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib

找尋解決方法，發現可透過apr和tomcat native解決。apr主要是為了提高靜態檔案的處理性能，以apache2.0為核心的http service，除了前面所提的，還有改變加密方式等…。

依照官方說明，需先安裝：

debain based
    apt-get install libapr1.0-dev libssl-dev

rpm based
    yum install apr-devel openssl-devel

**接著去官方[download apr](http://apr.apache.org/download.cgi)[ and apr-util](http://apr.apache.org/download.cgi)：**

wget http://ftp.mirror.tw/pub/apache/apr/apr-1.4.6.tar.gz
wget http://ftp.mirror.tw/pub/apache//apr/apr-util-1.4.1.tar.gz

**解壓縮和編譯apr：**

tar zxvf apr-1.4.6.tar.gz   
cd apr-1.4.6.tar.gz  
./configure  
make  
make install

**解壓縮和編譯apr-util：**

tar zxvf apr-util-1.4.1.tar.gz  
cd apr-util-1.4.1.tar.gz  
./configure --with-apr=/usr/local/apr  
make  
make install 

**安装 tomcat-native：**

cd /usr/local/apache-tomcat-7.0.30/bin  
tar zxvf tomcat-native.tar.gz  
cd tomcat-native-1.1.14-src/jni/native  
./configure --with-apr=/usr/local/apr --with-java-home=/usr/java/jdk1.6.0_26  
make  
make install  

**配置apr的環境：**

vi /etc/profile  
# 在檔案最後面，加入以下内容  
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/apr/lib  
# 使profile生效
source /etc/profile  

**啟動tomcat和顯示資訊：**

bin/startup.sh  
head logs/catalina.out