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.
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