Linux下Springboot解决`APR based Apache Tomcat Native library`提示

最近转行做java，开发基于Springboot的项目，版本号为2.1.0.RELEASE.

启动应用，发现以下提示：

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-1.8-openjdk/jre/lib/amd64/server:/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64:/usr/lib/jvm/java-1.8-openjdk/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]

提示告知，使用基于Apache Tomcat Native library的ARP可以提升生产环境性能.

以下是从网上节选的话语：

apr是从操作系统级别解决异步IO问题，大幅度提高服务器的并发处理性能，也是Tomcat生产环境运行的首选方式.

目前Tomcat 8.x默认情况下全部是运行在nio模式下，而apr的本质就是使用jni技术调用操作系统底层的IO接口.

如此具有诱惑力，当然值得花费时间去解决，按照网上教程安装依赖：

sudo apt-get isntall libapr1-dev libssl-dev libtcnative-1

此处，需要注意网上给出的资源大多数是libapr以及libtcnative，安装时提示无法找到.

因此，搜索到包名被修改成上述定义.

$ dpkg -L libtcnative-1

# 以下是输出信息
/.
/usr
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/libtcnative-1.a
/usr/lib/x86_64-linux-gnu/libtcnative-1.so.0.2.16
/usr/lib/x86_64-linux-gnu/pkgconfig
/usr/lib/x86_64-linux-gnu/pkgconfig/tcnative-1.pc
/usr/share
/usr/share/doc
/usr/share/doc/libtcnative-1
/usr/share/doc/libtcnative-1/README.Debian
/usr/share/doc/libtcnative-1/changelog.Debian.gz
/usr/share/doc/libtcnative-1/changelog.gz
/usr/share/doc/libtcnative-1/copyright
/usr/share/lintian
/usr/share/lintian/overrides
/usr/share/lintian/overrides/libtcnative-1
/usr/lib/x86_64-linux-gnu/libtcnative-1.so
/usr/lib/x86_64-linux-gnu/libtcnative-1.so.0

使用dpkg可以得知，libtcnative-1的静态库被安装至：/usr/lib/x86_64-linux-gnu.

因此，启动程序：

java -jar -Djava.library.path=/usr/lib/x86_64-linux-gnu cache-0.0.1-SNAPSHOT.jar
Picked up _JAVA_OPTIONS:   -Dawt.useSystemAAFontSettings=gasp

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.1.RELEASE)

org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/9.0.13
2019-01-10 15:33:55.586  INFO 2243 --- [           main] o.a.catalina.core.AprLifecycleListener   : An older version [1.2.16] of the APR based Apache Tomcat Native library is installed, while Tomcat recommends a minimum version of [1.2.18]
2019-01-10 15:33:55.586  INFO 2243 --- [           main] o.a.catalina.core.AprLifecycleListener   : Loaded APR based Apache Tomcat Native library [1.2.16] using APR version [1.6.3].
2019-01-10 15:33:55.586  INFO 2243 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2019-01-10 15:33:55.586  INFO 2243 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
2019-01-10 15:33:55.597  INFO 2243 --- [           main] o.a.catalina.core.AprLifecycleListener   : OpenSSL successfully initialized [OpenSSL 1.1.0h  27 Mar 2018]
2019-01-10 15:33:55.748  INFO 2243 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

输出的启动信息中，可以看到APR based Apache Tomcat Native library被加载了.

但是让人心塞的是，输出信息中提示版本过低，不满足现阶段使用的最小版本要求(差了两个小版本号).

An older version [1.2.16] of the APR based Apache Tomcat Native library is installed, while Tomcat recommends a minimum version of [1.2.18]

根据网上搜索结果可知，无法通过apt-get去安装高版本的libtcnative,只能手动编译安装.

因此，去Tomcat官网下载(http://tomcat.apache.org/native-doc/),可以看到最新的版本号为1.2.19，于是下载源码包.

解压后可以看到目录结构：

.
├── build.properties.default
├── build.xml
├── CHANGELOG.txt
├── CMakeLists.txt
├── docs
├── examples
├── java
├── jnirelease.sh
├── LICENSE
├── native
├── NOTICE
├── README.txt
├── test
├── TODO.txt
└── xdocs

执行以下命令，进行编译安装：

sudo apt-get autoremove libtcnative-1 #删除安装的库
cd native
./configure && make -j 4
sudo make install

此处，configure命令无需按照官网指示配置参数，会自行搜索依赖所在路径.

安装完之后，可以得知静态库被安装至/usr/local/apr/lib.

重新启动程序：

java -jar -Djava.library.path=/usr/local/apr/lib cache-0.0.1-SNAPSHOT.jar

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.1.RELEASE)

o.a.catalina.core.AprLifecycleListener   : Loaded APR based Apache Tomcat Native library [1.2.19] using APR version [1.6.3].
2019-01-10 15:48:29.130  INFO 7538 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2019-01-10 15:48:29.130  INFO 7538 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
2019-01-10 15:48:29.136  INFO 7538 --- [           main] o.a.catalina.core.AprLifecycleListener   : OpenSSL successfully initialized [OpenSSL 1.1.0h  27 Mar 2018]
2019-01-10 15:48:29.255  INFO 7538 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

通过输出信息，可以得知：程序完美加载APR based Apache Tomcat Native library,性能就等着提升了.

将参数设置到idea的VM options中，调试的时候也舒服了许多.

PS:

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